Huge thank you for explaining how to use 2 cells and 1 cell. There is a lot of info on 4 cell wiring in the internet, but almost no info on other configs
Great video. I've been working on a little project to transform an old bathroom scale into "smart scales" but didn't want to have to solder 12 wires into the "combinator" board that I have to then find out I had done it incorrectly. Showing the resistance between each wire and what to expect and more importantly "why", was a great aid. My load cells are in fact exactly the same as yours in terms of colour coding. I can't wait to get started this weekend! Once I've finished the project and I do a little write-up I will definitely recommend your channel!
I have spent hours looking for something like this online. I keep on coming back to it! Thanks so much. The presentation is incredibly well put together! Circuit tested and it worked!
hi i did the same thing as he did but when I put the weight I got the wrong result for example when I put a weight of 1200 g =>>>> i have this result Now, place your known mass on the loadcell. Then send the weight of this mass (i.e. 100.0) from serial monitor. Known mass is: 1200.00 New calibration value has been set to: 3.13, use this as calibration value (calFactor) in your project sketch. Save this value to EEPROM adress 0? y/n Value 3.13 saved to EEPROM address: 0 End calibration *** To re-calibrate, send 'r' from serial monitor. For manual edit of the calibration value, send 'c' from serial monitor. *** Load_cell output val: 1209.92 Load_cell output val: 1225.28 Load_cell output val: 1225.28 Load_cell output val: 1225.28 Load_cell output val: 1240.64 Load_cell output val: 1245.44 Load_cell output val: 1256.64 Load_cell output val: 1255.36 . . . Load_cell output val: 2963.20 Load_cell output val: 2950.08 Load_cell output val: 2933.76 Load_cell output val: 2947.84 Load_cell output val: 2943.68 Load_cell output val: 2949.12
Sir, I have a doubt. I followed the same procedure, but the output of the load cell shows only NaN. I have checked the connections twice, but the result is still the same. What should I do, sir?
Thank you for the detailed video! For some reason my 3d printer was printing the load cell mounts completely solid with no opening at the bottom. To remedy this, I opened the STL files in Creo as a .prt and then saved it again as an .STL and it now prints correctly.
Thank you for this project explanation. I'm working on this project and when I uploaded the "persistent zero offset" code, I was getting six digit float values as output val instead of the actual weight value. Kindly assist please
Could you connect multiples of 4 of these load cells to a single HX711 to get a higher load rating? (for example 12pcs of 50kg cells to get 600kg load rating?) How would they be wired then?
I Just wanna thanks to you for share your knowlodge with us and this will help me with my school's projects more than ever cause I don't have real teacher's support and I need show this for him and I don't have any ideia where I've should start.. until now ♥️🇧🇷
Thanks for the video I need to make something to measure 1 mg to 1 g can I use this tools or the measurements wit this device isn’t going to be precise to 1 mg.
Very nice video, but I have a problem getting the measurements. The values I get are constantly oscillating and none of them are correct. What could the problem be?
I am new to the world of Audrino IDE. I am trying to build a scale using in-line load cells to a junction box to an amplifier to an Audrino Uno R3. I have a display hooked into the Audrino. I am looking to put fasteners onto the scale and convert the weight to PC count and have it show on the display. I am having problems on which libraries to load in the IDE and the proper coding to use to get the results that I seek. Any suggestions????
Thank you for your tutorial. How to connect the LCD screen with the board and what code should be added to display the index onto the screen? Could you please give more info about this and also the wiring diagram for adding the screen?
@indrek I'm utilizing the 2 load cell configuration and getting a readout in Arduino of "Load_cell output val: nan" after calibration...Any ideas on how to fix?
hi love the video, super well explained, but if i could please get some help?, im getting a drift with my measurements, like when i dont change the weight i still see the measurement either go up o down constantly, what could i be doing wrong?, i've already cheeked my connections, and everything seems to be in order could i have some faulty sensors?
It is normal with those cheap sensors. Those are suitable for short term measurements - you set the zero point and then measure. They will also drift over time due to temperature changes during the day.
Hi I’m a little new to this field and wanted to know if we can power two 2 load sensor setups with one arduino(ie basically two weighing machines with 100 each)?
@@IndrekL how would the program work? I intend to take the readings simultaneously. So would I need to combine the functionalities of both hx711 or would I be able to run two separate programs at once?
Is there a good way to put some nice rubbery feet on the bottoms of the load cells? I want to build my own scale, but this would slide all around on a tile floor.
if i keep weight on it, for weeks at a time, (trying to dehydrate products) you mentioned it can drift overnight up to 1kg?? how do i overcome this to meet something i can rely on for constant measurement over weeks?
The tutorial worked great! exactly as expected. But now I was trying to connect the DouT and SCK To other pins on the arduino, but nothing seems to work. I looked at the pin layout and what each can do so why doesn't it work to change pin 4 and 5 to 8 and 9? The endgoal for me is to get 4 different scales working on one arduino at the same time.
What is the accuracy we get using a single 50kg load cells. The readings i get is very erratic and everytime I take the weight off the tare weight seems to change
in such a case, if one of the 4 load cells is not working, or is out of order, how do we find out which one that one is? Instead of having to test all 4 one by one?
Great video. I have one question, what is the problem if the load cell can't detect any Calibration it is still a 0 value? First, I already did but now it didn't get the calibration factor. The load cell, module, and wiring are good. I don't know what is that the problem
It is important that there is room for the inner part to flex. The mounting frame helps it. You could also drill a hole into your mounting plate to make room for the inner part to move relative to the outer part.
HI .. Can Ibuy a scale and connect it to arduino with a small robot arm connecting to the same arduino so that if thw weight of the object goes down , the robot arm can get a signal and take the object away ?
I have just purchased an S-type load cell which has 5 output wires, will I be able to use this set up to take a reading? If so what is the fifth wire for? I hope you can help, thank you Anton
Hi! Thank you for your explanation! I'm trying to use the same load cells but I'm having an issue. The readings form the HX711 just keep going up very quickly. That is, I cannot get a stable reading form the load cells. No matter if I use one, two or four cells. I also tried different hx711 breakouts. The issue is the same. Have you encountered this issue or can you give some advice how to handle it?
i am using nodemcu for this porject but it is showing NaN error in the serial monitor .......can you plzz help me how to do it with nodemcu ......as it will in my final year project ......
Hi, I am using a one button load cell (Load Cell - 200kg, Disc (TAS606)) to measure weight, it has allready 5 wires, so I am just connecting it to HX711 to amplify the output. Now the problem is the reading are very unstable, swaying around very fast. Is there a way to satbilise its readings? Thanks for your help
Hello, thank you so much for this tutorial. I am confused on one point-> in your video, when you wire your four weight sensors it appears the sensors are arranged (referencing the red wire) E+ upper left, A- upper right, E- lower right, A+ lower left. The wiring diagram on your video shows the same clockwise arrangement of E+,A-,E-,A+. However, the diagram connects white->white on the top sensors and bottom sensors & black->black on side sensors. When you wire in the video you have flipped, with black on top-bottom and white on side-side. Am I wrong/or missing something...or does this change not affect anything?
If you were to apply a load to the sensors, would you notice a increase/decrease in the resistance that’s significantly different than 1 ohm? I think my cells are defective
Hi Indrek. I have been trying to follow this video and I assembled the parts to build the 2x50kg. I am using an ESP32 wroom instead of the Arduino but it seems when I do the calibration, there is a big variation of values while measuring and if I remove the weight or add more weight, it doesn't update for the correct weight. Could you help me to find the reason? Is there something extraordinary we need to consider if we use the ESP32-WROOM? Thank you in advance.
Hey mate, I am not indrek but I had the same issue: Esp32 provides 3.3v Hx711 requires 5v. I changed my project to Arduino. If you find a way to run with esp32, send me a message please.
@@joaomonizgomes hey mate, believe whatever you want, I really don't care. Hard facts: - according to datasheet, hx711 boards coming with loadcells require 5v to operate - hx711 boards coming with loadcells have a 22kOhm resistor, which many people achieved to change to a 10kOhm resistor so it works with 3.3v - After changing it from esp32 to Arduino, I get very solid results. So, feel free to believe whatever you want mate.
I am a year three student,may I know is it a must to connect the wire and amplifier by modelling? or I just need to plug the wire in the hole of the amplifier is already fine?
Very clear video tutorial. I bought all the parts and build exactly according to the steps. I am using the 4 sensor version. Resistance between E+ and E- is 2000 Ohms and resistance between A+ and A- is also 2000 Ohms. Running the calibration sketch, I get "nan" after tare and the known weight (483 grams) in my case). Any idea would be much appreciated. Thanks for sharing
hey, i made the same setup with four. When I run the program, it shows the correct value at the beginning, but immediately starts to increase or decrease slowly and endlessly. Any idea?
I would like to use I2C concept because i want to connect each load cell seprately to single arduino so do i need to keep each amplifier for each load cell or is it sufficient connecting each load cell separately to single amplifier, please suggest?
Thank you for video, it helped me. one question, please, what do you think, supposing that between the plate with the four load cells and the arduino will be a cable of 2 meters, would be better that the hx711 to be on the plate or on the arduino? the analog signal from the bridge is around 1mv and maybe will be not transmitted accurate. Thank you
You are working with 50Kg cells, and I note you test the 4-cell scale with your weight (68Kg). With 4-cell configuration, whats the max weight supported? - Is OK for 120Kg
Thank you for this, would it be possible for you to make a video on how to add an Internet and bluetooth monitoring to this project, admittedly I dont have any knowledge of arduino but would like to understand and learn from a complete project that i can dissect slowly, thanks again
Hi, This is very good video, no wit is time to got to the next level of tearing down smart scale which use bluetooth connection to send the data to the mobile app!
Hi, I don't understand how hx711 output excitation can be convert from mass values by arduino ? 0V=0g? or the module convert directly analog signal from numeric ?
Hey! The HX711 module measures the small voltage difference and coverts it to a numeric value. This value is then digitally sent to Arduino. This value has no direct relation to weight. It's just an arbitrary number that linearly changes when you put more weight on the load cells. Let's say that the current value is 11044 (it's just a random example). Now you must put a known weight on the cell. I put an iPhone 5 that is 113g. Let's say that the value from the HX711 is now 11377. And we get 11377-11044 = 333 = 113g. And we can interpolate from there.
Should the resistance change when I verify using multimeter and press them hard? Because my program is running but no weight detected at all :( My serial is outputing: "output val: nan"
Excellent tutorial, when I am calibrating the 4x 50 kg configuration my output values are significantly variable and cannot hold close to any mass. Is there any common causes for such instability/noise in the output?
Indrek it can be as great and sometimes greater than 1kg. Plus i find if i add a new load (5kg dumbell) it doesn’t end up recognizing the new load. I tried resoldering the connections to see if it would make a difference but I am seeing the same issue. Cheers for getting back to me
If I wanted to weigh something larger than a scale -- let's say 2m x 3m -- would it make sense to use four separate sets of four load cells in a full bridge configuration and add up the weights measured by each? Or is there a way to wire all four sets (total of 16 load cells) together? what would you recommend? I think (but may be wrong) I would not want to use only four load cells over this large span as the material over top of it would flex too much and I don't think it would be accurate. Thank you for any insight you have! And great video. I should also say the thing I am measuring will have four legs which I would place each scale under (it's a table).
Hey! It seems sensible to use sets of four in each corner. Specially if the weight on one corner might go over 50kg. And of course as you mentioned more cells would give more support to the plate. I am not sure if it is possible to connect 16 of them into one circuit. Maybe if you somehow group the tension and compression strain gauges together... It seems very complicated. Even if it is possible it would be much easier to use multiple HX711 modules and then add the weights together.
thanks for the great video, really usefull, i would like to know how to reuse the calibration value so i do not have to calibrate it everytime i run the program
Hey! After you have run the "HX711_ADC"->"Calibration" once then the calibration parameter has been written to the eeprom address 0. Then you can open "HX711_ADC"->"Read_1x_load_cell" instead. Uncomment line 28: EEPROM.get(eepromAdress, calValue); Then it will read the calibration parameter from eeprom and you don't have to re-calibrate every time.
Hey, I've tried to write the command in line 28 in Read 1x load cell example but then I get " 'EEPROM' does not name a type" error message. How could I possibly resolve it?
@@rakabayuwana4830 Hey! The example code has changed since the video. It's not line 28 anymore. Find this line: //EEPROM.get(calVal_eepromAdress, calibrationValue); and remove the two "//" in front of it.
Is there a way to increase the response time? When I place an iphone 5 on the scale it registers quickly but when it is removed then placed back again, it takes longer to get the same reading, counting upwards in increments of 10, load_cell output val: 112.32 Load_cell output val: 112.49 Load_cell output val: 112.32 Load_cell output val: 105.48 Load_cell output val: 98.12 Load_cell output val: 91.06 Load_cell output val: 84.01 Load_cell output val: 76.86 Load_cell output val: 69.76 Load_cell output val:
Very good video, but I have a problem with the sensor readings when using 2 loadcell, the serial monitor does not increase the reading even though the load given is heavier... Help me please i have project with loadcell and im stuck
I've been looking everywhere for how to use just a single one, and you not only explained it but made some diagrams. Thanks!
Huge thank you for explaining how to use 2 cells and 1 cell. There is a lot of info on 4 cell wiring in the internet, but almost no info on other configs
Great video. I've been working on a little project to transform an old bathroom scale into "smart scales" but didn't want to have to solder 12 wires into the "combinator" board that I have to then find out I had done it incorrectly. Showing the resistance between each wire and what to expect and more importantly "why", was a great aid. My load cells are in fact exactly the same as yours in terms of colour coding. I can't wait to get started this weekend! Once I've finished the project and I do a little write-up I will definitely recommend your channel!
Thanks!
Man, thanks a lot. Not many people that explain about loadcell such as the 3 wire loadcell. God bless you man
I have spent hours looking for something like this online. I keep on coming back to it! Thanks so much. The presentation is incredibly well put together! Circuit tested and it worked!
hi i did the same thing as he did but when I put the weight I got the wrong result for example
when I put a weight of 1200 g =>>>> i have this result
Now, place your known mass on the loadcell.
Then send the weight of this mass (i.e. 100.0) from serial monitor.
Known mass is: 1200.00
New calibration value has been set to: 3.13, use this as calibration value (calFactor) in your project sketch.
Save this value to EEPROM adress 0? y/n
Value 3.13 saved to EEPROM address: 0
End calibration
***
To re-calibrate, send 'r' from serial monitor.
For manual edit of the calibration value, send 'c' from serial monitor.
***
Load_cell output val: 1209.92
Load_cell output val: 1225.28
Load_cell output val: 1225.28
Load_cell output val: 1225.28
Load_cell output val: 1240.64
Load_cell output val: 1245.44
Load_cell output val: 1256.64
Load_cell output val: 1255.36
.
.
.
Load_cell output val: 2963.20
Load_cell output val: 2950.08
Load_cell output val: 2933.76
Load_cell output val: 2947.84
Load_cell output val: 2943.68
Load_cell output val: 2949.12
Please share the code 👌
Thank you very much, your tutorial is excellent!
Glad it was helpful!
Sir, I have a doubt.
I followed the same procedure, but the output of the load cell shows only NaN.
I have checked the connections twice, but the result is still the same.
What should I do, sir?
Thank you for the detailed video! For some reason my 3d printer was printing the load cell mounts completely solid with no opening at the bottom. To remedy this, I opened the STL files in Creo as a .prt and then saved it again as an .STL and it now prints correctly.
Maybe it depends on the slicer software. I used MatterControl and had no issues.
I found it on Thingiverse and I didn't design this part myself.
Indrek that’s a good point. I was using Cura for this project. Do you have a preferred layer height for good strength?
Excellent brother. This worked perfectly on NodeMCU with my hacked bathroom scale
is it possible to connect 3 load cells?
Thank you for this project explanation. I'm working on this project and when I uploaded the "persistent zero offset" code, I was getting six digit float values as output val instead of the actual weight value. Kindly assist please
Could you connect multiples of 4 of these load cells to a single HX711 to get a higher load rating? (for example 12pcs of 50kg cells to get 600kg load rating?) How would they be wired then?
After Calibration step what should be done to check the output from load cell ?
I Just wanna thanks to you for share your knowlodge with us and this will help me with my school's projects more than ever cause I don't have real teacher's support and I need show this for him and I don't have any ideia where I've should start.. until now ♥️🇧🇷
Glad I could help!
I have been struggling. Is there a piece to help the HX711 amplifier module to the loadcell wires?
What is the maximum weight one can meaaure with this setup?
can you explain how i can display the value in the tft display??
Thanks for the video I need to make something to measure 1 mg to 1 g can I use this tools or the measurements wit this device isn’t going to be precise to 1 mg.
Good video. I am looking for a code to get in output 4 different measurement
can we conect to arduino without the clock pin ? tanks
Brother can you measure accurately below 5gm?
Hi how would I program 4 separate hx711 scale to show up on the arduino individually
Very good Tutorial, best on the load cells out there! Thank you!
Glad it was helpful!
Thanks for the great content, if I am getting negative from my sensor whar could be wrong
Very nice video, but I have a problem getting the measurements. The values I get are constantly oscillating and none of them are correct. What could the problem be?
Check th wiring. Maybe you have some bad connections. For me it was fluctating around 10 grams.
I am new to the world of Audrino IDE. I am trying to build a scale using in-line load cells to a junction box to an amplifier to an Audrino Uno R3. I have a display hooked into the Audrino. I am looking to put fasteners onto the scale and convert the weight to PC count and have it show on the display. I am having problems on which libraries to load in the IDE and the proper coding to use to get the results that I seek. Any suggestions????
Hi, do you think it would be possible to connect 6 sensors and thus achieve the possibility of measuring up to 300 kg?
Why not get a 300 kg sensor?
Can you create same video using 4 wire load cell
Can I use an esp32 for this project?
Thank you for your tutorial. How to connect the LCD screen with the board and what code should be added to display the index onto the screen? Could you please give more info about this and also the wiring diagram for adding the screen?
Hey! I didn't add screen to this tutorial since it depends which screen you have.
Every screen have it's own connection diagram and libraries.
@@IndrekL hi please can you upload the code with the screen ?
is there an HX711 library in C for BBB?
What if I have 4 cable load cells, What do I do with the green cables?
@indrek I'm utilizing the 2 load cell configuration and getting a readout in Arduino of "Load_cell output val: nan" after calibration...Any ideas on how to fix?
how you solucionated?
hi love the video, super well explained, but if i could please get some help?, im getting a drift with my measurements, like when i dont change the weight i still see the measurement either go up o down constantly, what could i be doing wrong?, i've already cheeked my connections, and everything seems to be in order could i have some faulty sensors?
It is normal with those cheap sensors. Those are suitable for short term measurements - you set the zero point and then measure. They will also drift over time due to temperature changes during the day.
hi, if we use the other lcd do we need to change the coding?
Hi I’m a little new to this field and wanted to know if we can power two 2 load sensor setups with one arduino(ie basically two weighing machines with 100 each)?
Hey! Yes, you can connect two HX711 modules to a single Arduino. Just connect to different pins.
@@IndrekL how would the program work? I intend to take the readings simultaneously. So would I need to combine the functionalities of both hx711 or would I be able to run two separate programs at once?
Is there a good way to put some nice rubbery feet on the bottoms of the load cells? I want to build my own scale, but this would slide all around on a tile floor.
if i keep weight on it, for weeks at a time, (trying to dehydrate products) you mentioned it can drift overnight up to 1kg?? how do i overcome this to meet something i can rely on for constant measurement over weeks?
How to connect 6 four load cell with hx711?
Is this load sensor suitable for underwater use?
The tutorial worked great! exactly as expected. But now I was trying to connect the DouT and SCK To other pins on the arduino, but nothing seems to work. I looked at the pin layout and what each can do so why doesn't it work to change pin 4 and 5 to 8 and 9? The endgoal for me is to get 4 different scales working on one arduino at the same time.
So i was having these problems on a Nano, but I changed it to a UNO and now it does work with different pins. Still don't know why though.
Load_cell output val in calibration serial port: nan ,what could be the problem
? thank you
same here
What is the accuracy we get using a single 50kg load cells. The readings i get is very erratic and everytime I take the weight off the tare weight seems to change
This amazing! Quick question. How much energy does this setup use if left on for an hour?
Anyone know how would a diagram for wiring up 3 x 50 kg load cells look like?
in such a case, if one of the 4 load cells is not working, or is out of order, how do we find out which one that one is? Instead of having to test all 4 one by one?
Hello, a query do you have the design of the housing that you did to the cell please, I need that to be able to print it in 3D, thanks for the video.
Great video. I have one question, what is the problem if the load cell can't detect any Calibration it is still a 0 value? First, I already did but now it didn't get the calibration factor. The load cell, module, and wiring are good. I don't know what is that the problem
Is it necessary mounting case for load cell?.... plz reply
It is important that there is room for the inner part to flex. The mounting frame helps it. You could also drill a hole into your mounting plate to make room for the inner part to move relative to the outer part.
Clearly described and just what I needed for a project. Thanks for sharing 👍🏼 My project will sound different though 😉
Excellent work, congratulations!! if I wanted to activate a relay output from Arduino on a weight greater than 50Kg how could I do it?
Help, how do you connect 3 load cells?
Does it need to be recalibrated everytime i turn it off and start it?
HI .. Can Ibuy a scale and connect it to arduino with a small robot arm connecting to the same arduino so that if thw weight of the object goes down , the robot arm can get a signal and take the object away ?
I have just purchased an S-type load cell which has 5 output wires, will I be able to use this set up to take a reading? If so what is the fifth wire for?
I hope you can help, thank you
Anton
Hi! Thank you for your explanation! I'm trying to use the same load cells but I'm having an issue. The readings form the HX711 just keep going up very quickly. That is, I cannot get a stable reading form the load cells. No matter if I use one, two or four cells. I also tried different hx711 breakouts. The issue is the same. Have you encountered this issue or can you give some advice how to handle it?
Same issue
did you find any solutions
if yess plzz share with us its urgent
😇 Thank you so much, the explanation was pretty detailed. I have been all over the internet for this...
Is it possible to connect 4 pairs of load cells (total 8 cells); to give 4 output values?
How can wiring this HX711 to plc? Its possible?
hi, can you help me? every time i try to calibrate it returns nan, do you have any idea how to fix this?
i am using nodemcu for this porject but it is showing NaN error in the serial monitor .......can you plzz help me how to do it with nodemcu ......as it will in my final year project ......
Hi, I am using a one button load cell (Load Cell - 200kg, Disc (TAS606)) to measure weight, it has allready 5 wires, so I am just connecting it to HX711 to amplify the output. Now the problem is the reading are very unstable, swaying around very fast. Is there a way to satbilise its readings? Thanks for your help
Thanks for detail making video. Can I ask how you connected the jumper cable with HX711 ?
Could you add more cells to make the scale capable of measuring higher weight?
I believe so
Hello, thank you so much for this tutorial. I am confused on one point-> in your video, when you wire your four weight sensors it appears the sensors are arranged (referencing the red wire) E+ upper left, A- upper right, E- lower right, A+ lower left. The wiring diagram on your video shows the same clockwise arrangement of E+,A-,E-,A+. However, the diagram connects white->white on the top sensors and bottom sensors & black->black on side sensors. When you wire in the video you have flipped, with black on top-bottom and white on side-side. Am I wrong/or missing something...or does this change not affect anything?
please provide the library HX711 ADC.
its not available at the given link. it says no server found.
i need the library very much . Please help out.
Can this project be created using an arduino r4 wifi?
Brilliantly explained video! I’ll be keeping tuned in.
Awesome, thank you!
If you were to apply a load to the sensors, would you notice a increase/decrease in the resistance that’s significantly different than 1 ohm? I think my cells are defective
hi good video bro, excuse me i have a question i need the load cell but for 200kg with the old bathroom scale how can i calibrate for that?
Hi Indrek. I have been trying to follow this video and I assembled the parts to build the 2x50kg. I am using an ESP32 wroom instead of the Arduino but it seems when I do the calibration, there is a big variation of values while measuring and if I remove the weight or add more weight, it doesn't update for the correct weight.
Could you help me to find the reason? Is there something extraordinary we need to consider if we use the ESP32-WROOM?
Thank you in advance.
Hey mate,
I am not indrek but I had the same issue:
Esp32 provides 3.3v
Hx711 requires 5v.
I changed my project to Arduino. If you find a way to run with esp32, send me a message please.
@@drotalion Not fully sure if that's 100% the issue. Did you solve it by providing 5V?
@@joaomonizgomes hey mate, believe whatever you want, I really don't care.
Hard facts:
- according to datasheet, hx711 boards coming with loadcells require 5v to operate
- hx711 boards coming with loadcells have a 22kOhm resistor, which many people achieved to change to a 10kOhm resistor so it works with 3.3v
- After changing it from esp32 to Arduino, I get very solid results.
So, feel free to believe whatever you want mate.
I am a year three student,may I know is it a must to connect the wire and amplifier by modelling? or I just need to plug the wire in the hole of the amplifier is already fine?
Great video!!! Is IT possible to setup IT with GSM module so i can receive SMS on demand with actual weight of beehive?
hi thank you for this wonderful video. Please do you have a code that display the load scale every 10 minutes. and thank you
How to connect 4x4 wire loadcell with the single amplifier and can I prefer the same arduino code ??
You mean 16 cells into one circuit? I don't know if that is possible.
Hello, can i use 2 of them for 100kg? Thanks!
En la configuración de 4 celdas cuánto es el peso máximo que puede cargar ?
what screen did you use?
Very clear video tutorial. I bought all the parts and build exactly according to the steps. I am using the 4 sensor version. Resistance between E+ and E- is 2000 Ohms and resistance between A+ and A- is also 2000 Ohms. Running the calibration sketch, I get "nan" after tare and the known weight (483 grams) in my case). Any idea would be much appreciated.
Thanks for sharing
Usually nan means that there is a problem with wiring. If everything is connected correctly then try to solder the wires if you haven't done it yet.
@@IndrekL I have all wires soldered down. I copied every move you made. Using same hx711 and same leonardo. Still getting "nan". Help meeeee pleaseee
@@IndrekL Also checked the resistance between the opposing wires = 1.98 kOhm
hey, i made the same setup with four. When I run the program, it shows the correct value at the beginning, but immediately starts to increase or decrease slowly and endlessly. Any idea?
I would like to use I2C concept because i want to connect each load cell seprately to single arduino so do i need to keep each amplifier for each load cell or is it sufficient connecting each load cell separately to single amplifier, please suggest?
Thank you for video, it helped me.
one question, please, what do you think, supposing that between the plate with the four load cells and the arduino will be a cable of 2 meters, would be better that the hx711 to be on the plate or on the arduino?
the analog signal from the bridge is around 1mv and maybe will be not transmitted accurate.
Thank you
Plate of course
You are working with 50Kg cells, and I note you test the 4-cell scale with your weight (68Kg). With 4-cell configuration, whats the max weight supported? - Is OK for 120Kg
Hey i want to meassure gramms, do they come in different sensitivities
These three-wire load cells are 50kg each. But you can get the four-wire straight block load cells at lower weight range.
Is there any solution for 6 load cells ? (or I need to use 2 HX711 and read them both from the microcontroller?)
Wauw. looks great! can i use 6 pieces of weight scale? i need 300kg. can i use B- und B+ for it?
Thank you for this, would it be possible for you to make a video on how to add an Internet and bluetooth monitoring to this project, admittedly I dont have any knowledge of arduino but would like to understand and learn from a complete project that i can dissect slowly, thanks again
Hi, This is very good video, no wit is time to got to the next level of tearing down smart scale which use bluetooth connection to send the data to the mobile app!
After using 4 load cell what is the maximum weight?
Do we always have to input the first value like you did 113 for iPhone 5 or is it only required for first boot ?
Hey! You need to do it once. After the calibration value is saved then you can use the save calibration constant for your load cell.
Great job this was a great help for my little pet project that I was gonna work on.
Hi, I don't understand how hx711 output excitation can be convert from mass values by arduino ? 0V=0g? or the module convert directly analog signal from numeric ?
Hey! The HX711 module measures the small voltage difference and coverts it to a numeric value. This value is then digitally sent to Arduino. This value has no direct relation to weight. It's just an arbitrary number that linearly changes when you put more weight on the load cells.
Let's say that the current value is 11044 (it's just a random example). Now you must put a known weight on the cell. I put an iPhone 5 that is 113g. Let's say that the value from the HX711 is now 11377. And we get
11377-11044 = 333 = 113g. And we can interpolate from there.
@@IndrekL Oh thanks you ! I now understand how it works :)
Should the resistance change when I verify using multimeter and press them hard? Because my program is running but no weight detected at all :( My serial is outputing: "output val: nan"
Excellent tutorial, when I am calibrating the 4x 50 kg configuration my output values are significantly variable and cannot hold close to any mass. Is there any common causes for such instability/noise in the output?
How much noise do you get? For it always fluctuated around +-10 grams
Indrek it can be as great and sometimes greater than 1kg. Plus i find if i add a new load (5kg dumbell) it doesn’t end up recognizing the new load. I tried resoldering the connections to see if it would make a difference but I am seeing the same issue. Cheers for getting back to me
@@Powerhouse415
I'm experiencing the same problem, I'm even thinking it's coz I damaged the Amp module when soldering
If I wanted to weigh something larger than a scale -- let's say 2m x 3m -- would it make sense to use four separate sets of four load cells in a full bridge configuration and add up the weights measured by each? Or is there a way to wire all four sets (total of 16 load cells) together? what would you recommend? I think (but may be wrong) I would not want to use only four load cells over this large span as the material over top of it would flex too much and I don't think it would be accurate. Thank you for any insight you have! And great video.
I should also say the thing I am measuring will have four legs which I would place each scale under (it's a table).
Hey! It seems sensible to use sets of four in each corner. Specially if the weight on one corner might go over 50kg. And of course as you mentioned more cells would give more support to the plate.
I am not sure if it is possible to connect 16 of them into one circuit. Maybe if you somehow group the tension and compression strain gauges together... It seems very complicated. Even if it is possible it would be much easier to use multiple HX711 modules and then add the weights together.
thanks for the great video, really usefull, i would like to know how to reuse the calibration value so i do not have to calibrate it everytime i run the program
Hey!
After you have run the "HX711_ADC"->"Calibration" once then the calibration parameter has been written to the eeprom address 0.
Then you can open "HX711_ADC"->"Read_1x_load_cell" instead.
Uncomment line 28: EEPROM.get(eepromAdress, calValue);
Then it will read the calibration parameter from eeprom and you don't have to re-calibrate every time.
Hey, I've tried to write the command in line 28 in Read 1x load cell example but then I get " 'EEPROM' does not name a type" error message. How could I possibly resolve it?
@@rakabayuwana4830 Hey! The example code has changed since the video. It's not line 28 anymore.
Find this line:
//EEPROM.get(calVal_eepromAdress, calibrationValue);
and remove the two "//" in front of it.
Is there a way to increase the response time? When I place an iphone 5 on the scale it registers quickly but when it is removed then placed back again, it takes longer to get the same reading, counting upwards in increments of 10, load_cell output val: 112.32
Load_cell output val: 112.49
Load_cell output val: 112.32
Load_cell output val: 105.48
Load_cell output val: 98.12
Load_cell output val: 91.06
Load_cell output val: 84.01
Load_cell output val: 76.86
Load_cell output val: 69.76
Load_cell output val:
It depends on the cell. It takes time for it to settle back physically. I guess that more expensive cells may work faster
hello this is my project homework can you show me how to connect the screen and the codes
Very good video, but I have a problem with the sensor readings when using 2 loadcell, the serial monitor does not increase the reading even though the load given is heavier... Help me please i have project with loadcell and im stuck
It is most likely a connection issue. Did you solder all the wires?
how to add a screen is it the code for arduino is the same?