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For most average users with arduino background this is a great tutorial. Your gage handling practices in this video and adhesive info need improvement. The HX711 also has many issues with it's reading due to it's overly simplistic and antique architecture. A MUCH MUCH better BoB uses the ADS1120 or ADS1220. These are by FAR many orders of magnitude better be it more complicated. Selecting STC code, bridge arrangements, creep code, dealing with thermal issues (passive, manual, active) material installation, compensation for temperature range, gage protection, and more as well as proper gage installation techniques (glue dependent).
Your explanation was easy for me to understand. Thank you for putting out videos like this. Now I want to get some strain gages and try to use them in projects.
Thanks for this video and web page. I'm currently working on a mostly 3D printed bench-top dynamometer with a Nextion Enhanced touchscreen and a Arduino Pro micro. Features include volt meter, amp meter, tachometer, 10A relay, 10Kg load sensor, a geared stepper (to control the break from the touchscreen) and a buzzer. I was trying to work out how I would incorporate a calibration sequence into all this. This was the most helpful video i found. Many THANKS!
I've made a few bicycle power meters using strain gauges. I use a simple amplifier and the Arduino’s own ADC, very basic but actually gives decent power data when set up correctly.
When you need twisted pairs, you could use LAN cables disassembled. Each cable contains 4 very well twisted pairs. If you need longer cables, you can use RJ-45 connectors !
This is used to calculate a bending force as the material elongates and deforms, Would I be correct in saying the this could be used to measure a tensile force if it was applied parallel to the gauge instead of perpendicularly like in the video
how to measure continues. or can we put weight and don't take out or what happens if we. example : if we put under water tank and measure, how long it working.
Good job. I think you should choose a thicker wooden base. This one is thin and thus some of the strain or deformation is occurring in the base. This can lead to a lower reading on the device.
A good video. Go one step further and activate a relay, when the scale reaches a target weight; make that target weight adjustable via two buttons (+ve / -ve)
Can we a get wrong value when a same weight is placed at different places on the bord ? Because increase in distance between the sensor and the centre of mass of the applied weight can vary the torque. So the resistance of the sensor also vary.
Yes it could. But for this small setup the error is very low. Also if the plate is more solid it will help more. That's why for better results you could use the 4 load cells setup as a body weight scale
The load cells shown with two bolts on either end are contra-flexure differential bending beams. The cut outs cause a near parallelogram movement. These two points reduces by many orders of magnitude the variance based on distance. The non-functional example on a piece of plastic or glass on the end would be proportional to both force and distance. An experience load cell designers job is to negate these effects though combinations of mountings and corrective designs.
Thank you for this awesome video! How does commercial scale works without initial calibration? How do we make the scale more accurate say I want to measure how much gas left in a tank, which the accuracy of even 1gram is important
Electronoob thank you very much great video merry Christmas thank you very much, i am using flexible caulk to seal a crack in the area that was damaged but it did not reveal or show the sensor, i learned a lot ,
My lecturer sucks teaching his class and he's happy that Pandemic prevent him from having to conduct the Lab lecture. I have obtained good sound knowledge from your video...thanks a lot mate!
Let me understand better. Have you not taken into consideration the thermal drift of the materials? Did you add a particular zeroing system before calibration and every time the scale is turned on? I like this work of yours, especially for the fact that you used an ADC other than the Arduino one, which has little resolution and would introduce too much error. For now ... bravo.
The load cells are full wheatstone bridges and therefore passively compensated. A single gage will have high thermal drift characteristics especially if not matched to the material. This matching is matching the thermal expansion of the material to the STC or Self temperature compensation of the gage. This would help, but would not eliminate all of it. It also depends on the material of the element of the gage. Constantan gages have a flatter curve at room temperature, while Karma does not.
I want to make a scale from a strain gauge which can measure the weight of a vehicle on the high way. do you have any suggestions for what strain gauge to use.? definitely cheap and efficient
Hi dear great video, I have a question for you, do all load cells connect to the same HX711 sensor or does each weight have a different sensor according to its weight?
I am very new to electronics and I wanna built the compression sensor. Can I use the HX711 with only one strain gauge and how to connect it since there are only two wires? please help.
Thank you for a very nice video. One question though, how do you expect the longitudinal placement of the load on the load cell to affect the resistance measurement? If you think of it as a bending bar, it seems like the resistance would increase if you place the load further from the strain gauges as the lever arm would be longer.
I've got the same question. You would measure the torque (M), and divide it by the lever arm length (l), than you would get the force (F), because M = F x l
Actually, in this video, he got it wrong. The aluminum is not acting like a lever. Here's a video explaining it in detail, starting at minute 1:57 :) th-cam.com/video/sxzoAGf1kOo/w-d-xo.html
@@Bella11Ba I completely agree with you. That load cell looks like a lever arm to me and I'd think the deflection would depend on how far away you place the load. When I Goggle this, there's a surprising lack of results on this topic. I'd have to think the load would need to be directly above an identical spot on that load cell to be accurate.
I completely agree with you. That load cell looks like a lever arm to me and I'd think the deflection would depend on how far away you place the load. When I Goggle this, there's a surprising lack of results on this topic. I'd have to think the load would need to be directly above an identical spot on that load cell to be accurate.
You cant make correct mesurement like that. You have to put things exactly at the center of the platform or you need 4 legs and 4 sensors to compensate the position. Yes, there is something like torque.
for the 4 load cell setup with 1 load cell in each corner, how accurate is it when it come to weighing multiple items. like for example, what if there are like 5-10 items on the scale and the items are spread out all over, like some items are in different corners and some in the middle. Will this mess up with the total weight reading or will the scale be able to measure total weight accurately even with items spread out all over the scale?
Thank You - I have the idea for a project weighing seems to be the easiest way to measure. Your explanation was excellent - Thank you I am just learning about Arduino and it is simple enough plus flexible enough to handle my project. It is to easily measure volume (via weight) and control the temperature of water for a mash-lauter tun.
Hi, this video is really helpful for making a load cell. I am interested in measuring the deformation of a metal sheet using a similar setup. Can you please guide me a little bit?
hello sir, Thanks for this video. really help-full. I have a question in this video the reading in LCD showing only of weight can you please share the video, Reading of Force how it is applying. It will be really help-full. This video is really awesome form most of the other video i got it. Many thanksss !!!!!
Did you need to amplify the signal with additional components when using the strain gauge? I've also read that using more than 1 strain gauge can reduce error (for example, configuring 4 of them in a wheatstone bridge). Might be an interesting video.
While the HX711 I generally regard as fit for the trash, it does have a built in programmable gain. This combined with it's old sigma-delta design gives generally better quality and less noisy data (SAR uses sample and hold, Sigma-Delta "integrate" over time). There are many many strain gage configurations depending on what you are mechanically trying to sense. Poisson setups, bending arrangements, differential beam arrangements, etc. Each using multiple strain gages. Search Omega Strain positioning PDF for a quick reference.
Bro i want to ask a question about hx711 hx711 datasheet says if we send 25 pulse it will send a input if we send it 26 pulse it would answer with b input but there is a huge question in my mind. we have already got the all data before sending 26th pulse.
Nice video. QUESTION: Since your strain gauge is working off of the FLEX of a LEVER, the FARTHER out you place the item being measured, the MORE flex you will get due to torque, correct? For your scale to be accurate, the force would need to be directly ABOVE the strain gauge, NOT on a lever arm. Am I mistaken in my assumption? Anyone else notice this? Thanks and apologies if I'm incorrect ~ again, thanks for the video as I did learn from it :-)
Hello! I am very new to electronics, and I was wondering if we would still need a separate ADC unit if the microcontroller itself already has one? I keep reading that standard arduinos tend to have them built in... would you connect it straight into it?
Hello I used the same organs like you. The problem is, on the screen I get a variation on the value obtained after the weighing. So I need to stabilize this value, I don't know if there is a component / organ (filter for example) that I can use to stabilize the displayed value. Please help me
Greeting I have one question and maybe two :-). I would like to make one bee scale, but simple. Is it possible that there are only sensors under the hive or possibly hx711. And when I want to know how much weight it is, I connect only the arduino and it reads the state with hx711. All this interests me because of the consumption of the arduino and the batteries are quickly discharged and the weight is canceled again. I hope you will be able to help me and I am weak with this technique and thank you very much in advance.
You should divide by 2^24 when converting it (to voltage, force, mass...), though: forum.allaboutcircuits.com/threads/why-adc-1024-is-correct-and-adc-1023-is-just-plain-wrong.80018/
Congratulations for the video. I have a question, i hope that you can help me. The values that appear between the minutes 6:56 to 7:14 are voltage? or how can i convert these values in voltage?
The values from 6:56 to 7:14 are the readout of the HX711. There is a formula to convert from these values to the voltage. Assuming the relationship is linear, a known mass is needed in order to calibrate the scale and find the formula.
Thank you the fantastic instructions. Do I understand correctly that you used HX711 instead of Wheatstone bridge? Can I use Arduino Nano for the same project?
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Hi, can you do me a little project?, i can pay
This video really helped our Formula Student team with a cheap solution for a torsional stiffness test of our chassis.
I've learned something new and useful today. Thank you as always!!
Your projects are good for school and college projects.
For most average users with arduino background this is a great tutorial. Your gage handling practices in this video and adhesive info need improvement. The HX711 also has many issues with it's reading due to it's overly simplistic and antique architecture. A MUCH MUCH better BoB uses the ADS1120 or ADS1220. These are by FAR many orders of magnitude better be it more complicated. Selecting STC code, bridge arrangements, creep code, dealing with thermal issues (passive, manual, active) material installation, compensation for temperature range, gage protection, and more as well as proper gage installation techniques (glue dependent).
any more info on non-HX711 solutions ?
Do you have any suggestions on how to incorporate a thermistor into the scale sketch to compensate for thermal creep?
I long wondered how those load cells work , well now I understand the principal , thanks for feeding my brain !
He actually got the deformation part wrong. th-cam.com/video/sxzoAGf1kOo/w-d-xo.html Heres a link for a better explanation.
Your explanation was easy for me to understand. Thank you for putting out videos like this. Now I want to get some strain gages and try to use them in projects.
Very well explained! Thank you for sharing your knowledge with us!
Thanks for this video and web page. I'm currently working on a mostly 3D printed bench-top dynamometer with a Nextion Enhanced touchscreen and a Arduino Pro micro. Features include volt meter, amp meter, tachometer, 10A relay, 10Kg load sensor, a geared stepper (to control the break from the touchscreen) and a buzzer. I was trying to work out how I would incorporate a calibration sequence into all this. This was the most helpful video i found. Many THANKS!
I've made a few bicycle power meters using strain gauges.
I use a simple amplifier and the Arduino’s own ADC, very basic but actually gives decent power data when set up correctly.
Excellent presentation. Brings back memories of classes in Instrumentation Electronics.
ok so this is a strain gauge.. nice informative stuff
When you need twisted pairs, you could use LAN cables disassembled. Each cable contains 4 very well twisted pairs. If you need longer cables, you can use RJ-45 connectors !
Thanks for the detailed explanation!
This is used to calculate a bending force as the material elongates and deforms, Would I be correct in saying the this could be used to measure a tensile force if it was applied parallel to the gauge instead of perpendicularly like in the video
This is truly one of the best youtube channels ever . This guy even inspired me to make my own tech channel . Hope you reach 1M subs ❤❤❤
Does this sensor also work on a piece of cloth ?
how to measure continues.
or can we put weight and don't take out or what happens if we.
example : if we put under water tank and measure, how long it working.
for my second & final project, you're still my reference. thanks..
Thank you sir for this detailed video....wonderful explanation
In the calibration you put 283g. Can we do it with zero?
What is caliberated load and how can we calculate it to put it in the codes
Good job. I think you should choose a thicker wooden base. This one is thin and thus some of the strain or deformation is occurring in the base. This can lead to a lower reading on the device.
with wich colposant you've converte the résistance of the gauge to the voltage please ?
At work we use "free point tools" howver thr strain is translated to amps
A good video. Go one step further and activate a relay, when the scale reaches a target weight; make that target weight adjustable via two buttons (+ve / -ve)
Can we a get wrong value when a same weight is placed at different places on the bord ?
Because increase in distance between the sensor and the centre of mass of the applied weight can vary the torque. So the resistance of the sensor also vary.
Yes it could. But for this small setup the error is very low. Also if the plate is more solid it will help more. That's why for better results you could use the 4 load cells setup as a body weight scale
@@ELECTRONOOBS oh! Yea 🤘
@@ELECTRONOOBS oh lol I mentioned this in my comment
The load cells shown with two bolts on either end are contra-flexure differential bending beams. The cut outs cause a near parallelogram movement. These two points reduces by many orders of magnitude the variance based on distance. The non-functional example on a piece of plastic or glass on the end would be proportional to both force and distance. An experience load cell designers job is to negate these effects though combinations of mountings and corrective designs.
Thank you for this awesome video! How does commercial scale works without initial calibration? How do we make the scale more accurate say I want to measure how much gas left in a tank, which the accuracy of even 1gram is important
why are the objects placed on the edge? To account for a defect in the design?
can a load cell coupled with servo motor, or I will need an AC Motor to work with a Load cell (Strain)
can I connect single strain gauge to that amplifier?
Nice animations man, it makes the explanations very easy to follow.
Great Video. This is very useful for my project. Thank you for sharing all the info.
Electronoob thank you very much great video merry Christmas thank you very much, i am using flexible caulk to seal a crack in the area that was damaged but it did not reveal or show the sensor, i learned a lot ,
Very helpful video. I like it
Sorry can i used one single strain gauge instead of one load cell. I mean the code and schematic.
My lecturer sucks teaching his class and he's happy that Pandemic prevent him from having to conduct the Lab lecture. I have obtained good sound knowledge from your video...thanks a lot mate!
Let me understand better.
Have you not taken into consideration the thermal drift of the materials?
Did you add a particular zeroing system before calibration and every time the scale is turned on?
I like this work of yours, especially for the fact that you used an ADC other than the Arduino one, which has little resolution and would introduce too much error.
For now ... bravo.
No, for this simple example, no thermal drift of the materials was took in consideration...
I see....well,it's a good starting point.
Thanks for sharing the idea.
The load cells are full wheatstone bridges and therefore passively compensated. A single gage will have high thermal drift characteristics especially if not matched to the material. This matching is matching the thermal expansion of the material to the STC or Self temperature compensation of the gage. This would help, but would not eliminate all of it. It also depends on the material of the element of the gage. Constantan gages have a flatter curve at room temperature, while Karma does not.
thank you .... please how can i get the software?
i have strain gauge 3 wire, how could it connect to the HX711? in ur explanation, i see that u using 4 wiring
Hello how to get on LCD pressure force not weight
10:47 How can it measure ml ? ml is a unit for measuring volume, not mass...
Instead of weight, can this strain gauge measure pressure?
greetings sir, may you confirm that you are using half bridge strain gauge for this load cell?
how to connect the 4 cells with the 16x2 lcd?
hey I'm having issues downloading your libraries, can you show hoe to add them to the IDE?
I want to make a scale from a strain gauge which can measure the weight of a vehicle on the high way. do you have any suggestions for what strain gauge to use.? definitely cheap and efficient
Just make the strain bars thicker like he did with the acrylics, spring steel maybe
Excellent video! Thank you for sharing links to assist in replicating your projects.
@electronoobs Great video. What did you mean that the accuracy can be improved by 'more measure loops' in the code. Can you pls explain ?
When I run the program, the toggle between oz's, gm's, and mL doesn't work. Any ideas?
whats the name of the white glue you were using? :)
So with HX711 i can only use two strain gauge in a half bridge? Is there a board where i can use four strain gauge in a full bridge?
if i dont want to connect the arduino to the laptop but instead ill connect it to a power source like battery, will it still work?
Hi dear great video,
I have a question for you, do all load cells connect to the same HX711 sensor or does each weight have a different sensor according to its weight?
Hello sir can you please make a video on programming microcontroller through atmel studio
Thanks for sharing. Very informative
Best explanation!
I am very new to electronics and I wanna built the compression sensor. Can I use the HX711 with only one strain gauge and how to connect it since there are only two wires? please help.
I wonder if you could get any force measurement from a regular resistor?
Hi
How could i measure force in newton/meter using the strain guage?. What component i need to convert the analog voltage to newton/meter (force)?
Do you think a CNC digitizing touch probe could be made using these?
Thank you for a very nice video. One question though, how do you expect the longitudinal placement of the load on the load cell to affect the resistance measurement? If you think of it as a bending bar, it seems like the resistance would increase if you place the load further from the strain gauges as the lever arm would be longer.
I've got the same question. You would measure the torque (M), and divide it by the lever arm length (l), than you would get the force (F), because M = F x l
Actually, in this video, he got it wrong. The aluminum is not acting like a lever. Here's a video explaining it in detail, starting at minute 1:57 :) th-cam.com/video/sxzoAGf1kOo/w-d-xo.html
@@Bella11Ba I completely agree with you. That load cell looks like a lever arm to me and I'd think the deflection would depend on how far away you place the load. When I Goggle this, there's a surprising lack of results on this topic. I'd have to think the load would need to be directly above an identical spot on that load cell to be accurate.
I completely agree with you. That load cell looks like a lever arm to me and I'd think the deflection would depend on how far away you place the load. When I Goggle this, there's a surprising lack of results on this topic. I'd have to think the load would need to be directly above an identical spot on that load cell to be accurate.
Very nice explanation... Keep it up👍
Fantastic project, dude! Really nice! 😃
8:14 what is that green screen like thing name ?
Thank you, can you do a video on how to measure torque
You cant make correct mesurement like that. You have to put things exactly at the center of the platform or you need 4 legs and 4 sensors to compensate the position. Yes, there is something like torque.
Hi, where can I find this white paste for sealing the contacts? What is it called?
for the 4 load cell setup with 1 load cell in each corner, how accurate is it when it come to weighing multiple items. like for example, what if there are like 5-10 items on the scale and the items are spread out all over, like some items are in different corners and some in the middle. Will this mess up with the total weight reading or will the scale be able to measure total weight accurately even with items spread out all over the scale?
Thank You - I have the idea for a project weighing seems to be the easiest way to measure. Your explanation was excellent - Thank you
I am just learning about Arduino and it is simple enough plus flexible enough to handle my project. It is to easily measure volume (via weight) and control the temperature of water for a mash-lauter tun.
Hi, this video is really helpful for making a load cell. I am interested in measuring the deformation of a metal sheet using a similar setup. Can you please guide me a little bit?
Great. What do you use for creating these nice animations?
hello sir, Thanks for this video. really help-full. I have a question in this video the reading in LCD showing only of weight can you please share the video, Reading of Force how it is applying. It will be really help-full. This video is really awesome form most of the other video i got it. Many thanksss !!!!!
Did you need to amplify the signal with additional components when using the strain gauge?
I've also read that using more than 1 strain gauge can reduce error (for example, configuring 4 of them in a wheatstone bridge). Might be an interesting video.
While the HX711 I generally regard as fit for the trash, it does have a built in programmable gain. This combined with it's old sigma-delta design gives generally better quality and less noisy data (SAR uses sample and hold, Sigma-Delta "integrate" over time). There are many many strain gage configurations depending on what you are mechanically trying to sense. Poisson setups, bending arrangements, differential beam arrangements, etc. Each using multiple strain gages. Search Omega Strain positioning PDF for a quick reference.
Can the keypad be added to the project to add the item price and multiply it by weight in kilograms 🌷
The presentation is superb! I have question, which glue is used to attach the stain gauge to surface?
Bro i want to ask a question about hx711
hx711 datasheet says if we send 25 pulse it will send a input
if we send it 26 pulse it would answer with b input
but there is a huge question in my mind.
we have already got the all data before sending 26th pulse.
Nice video Sir
Nice video. QUESTION: Since your strain gauge is working off of the FLEX of a LEVER, the FARTHER out you place the item being measured, the MORE flex you will get due to torque, correct? For your scale to be accurate, the force would need to be directly ABOVE the strain gauge, NOT on a lever arm. Am I mistaken in my assumption? Anyone else notice this? Thanks and apologies if I'm incorrect ~ again, thanks for the video as I did learn from it :-)
Yes, torque matters, that's why you have 4 legs and 4 sensors.
Thank you so much ❤️
Hello! I am very new to electronics, and I was wondering if we would still need a separate ADC unit if the microcontroller itself already has one? I keep reading that standard arduinos tend to have them built in... would you connect it straight into it?
i love your videos top stuff fella.. :)
Nice project.Thanks for sharing.
Hello
I used the same organs like you. The problem is, on the screen I get a variation on the value obtained after the weighing.
So I need to stabilize this value, I don't know if there is a component / organ (filter for example) that I can use to stabilize the displayed value.
Please help me
Nice job ❤❤❤❤❤❤
Thank you for sharing this with us.😊.
how it stabilizes the weight to show
what type of arduino are u using?
Hello, great video, but I have a question: is the wheatstone bridge on the pcb or is it attached to the strain gauge? Thank you
Greeting
I have one question and maybe two :-).
I would like to make one bee scale, but simple. Is it possible that there are only sensors under the hive or possibly hx711.
And when I want to know how much weight it is, I connect only the arduino and it reads the state with hx711. All this interests me because of the consumption of the arduino and the batteries are quickly discharged and the weight is canceled again.
I hope you will be able to help me and I am weak with this technique and thank you very much in advance.
Great video but
6:58 (2^24)-1 because the 0 is included
Thanks for that
You should divide by 2^24 when converting it (to voltage, force, mass...), though: forum.allaboutcircuits.com/threads/why-adc-1024-is-correct-and-adc-1023-is-just-plain-wrong.80018/
Great information about strain gauge.
Congratulations for the video. I have a question, i hope that you can help me.
The values that appear between the minutes 6:56 to 7:14 are voltage? or how can i convert these values in voltage?
The values from 6:56 to 7:14 are the readout of the HX711. There is a formula to convert from these values to the voltage. Assuming the relationship is linear, a known mass is needed in order to calibrate the scale and find the formula.
Thank you the fantastic instructions. Do I understand correctly that you used HX711 instead of Wheatstone bridge?
Can I use Arduino Nano for the same project?
sir which software did u use to create this effects and animation,because i need to submit the project presentation in college.
Great work 👏
Cool project!!
Subbed good presentation of topic
Nice one was thinking about a long time to try making a weighing scale
wow.... perfect