Be careful when using this on a single power supply. You need the negative side to measure the shunt with Arduino and you cannot use the positive side when on same power source because when the load is disconnected you pump the full voltage into A0! (Or there might be a short circuit - not tested yet - could be possible). That is fine when the voltage is 5V or lower but if it is higher than 5V you can blow up your Arduino! To be on the safe side, always put the shunt at the negative terminal.
Thanks for this nice video! Is there a voltage limit that we can pass through the shunt? Let say i want to test at 24 volt DC, or maybe at 300volt DC, does i can use the same setup, and same wiring?
I think he is saying measure voltage using a different circuit. Someone else drew attention to the fact that higher volts may be unhealthy for the Arduino. I do not understand the "adjustment" parameter, but I think we're are asked to believe that this is a fudge for accurately measuring low current when the shunt is rated for higher current. Sampling and aggregating the data isn't really dealt with and the data is not time stamped because the Arduino does not have a clock! These are features I am looking for where I have 3 (or more) high end shunts for 3 separate battery banks.
So for multiple readings from multiple shunts (a) choose a 12 bit processor (b) rewrite the code so it samples each shunt in turn (c) optimise the code so it doesn't spend ages reading when there is no current Do you not seem to recommend measuring voltage at the same time, but with PWM and MPPT this will be varying so I guess there are two analogue input pins to be used?
is it possible to measure amps from 2 different shunt with 2 different voltage source? such as measuring amps from pv to scc & from scc to battery, since it has different voltage values..
yes of course. I have written this library which uses class. you can define different objects for shunt . Learn the meaning of object from this video th-cam.com/video/L6ekl2ABcuY/w-d-xo.html
@@robojax what i actually mean is, how to wire the shunt to the arduino, since arduino only has 1 GND for multiple analog input, and because we are measuring voltage drop on the shunt which there is still a voltage on the negative side of the shunt. And the we connect both negative side of the shunt parallel to the arduino GND. So there would be voltage different on the negative side of the shunt (i.e 30V on pv, 24V on the battery)
This is the problem of shunt. 5% error makes it hard to use high rated shunt for lower values. You gotta use proper Hall effect sensors. I have videos on those.
The code I have written will work with any shunt resistor. I have never seen any other. For the past 5 years I have been searching and never saw anything else.
@@robojax You are correct. The 75mv series of shunt resistors appear to be the norm. My guess is that this goes back to the days of analogue current meters providing an easy method of changing current scales. I enjoy watching and learning from your videos and look forward to many more. Should you decide to expand your collection of shunts search on Amazon for 50mv or 100mv base-mounted DC shunts.
Thanks. I have already made two videos ONE for LCD and the other on LED display. Both has been posted for my Patrons on Patreon.com and in 1 or two weeks I will publish them on youTube.
If you watch this video fully, you will learn tones of concepts including your question. yes. you can but watch this video fully. I've spent over 2 weeks to make this video.
With your question you made me watch the video. Just watch the video fully without skipping. I have not said anything extra. The answer is in the video.
Can I add some shunt resistor in parallel to its current limit? for example using two 50A shunt resistors in parallel to measure current up to 100A. Is there any advantage or disadvantage for doing that?
you didn't mention what sunt value you are using. But I have mentioned in the video that if your shunt of 100A has 10% tolerance, then, 10A is not going to be accurate. so calculate the 5% or 10% tolerance. Watch the video fully. I have spent over a week on this project.
Excellent presentation. There is still something bothering me..that is the ground for the Arduino....say that you have a battery bank of 48 volts made of 8 batteries in series (6 volt each)...hence your ground is just the reference...hence you can connect the ground cable to battery 6...but then the positive (A0)..must be at higher voltagec(battery 7 or 8) ...and obviously using the proper voltage divider to keep the voltage at A0 below 5 volts .... The issue here is that the Arduino has a ground coming from the USB...having another ground at a voltage level (36 volts) ...will that create a problem ??? Thanks.
Hello, if you have 48V, then you have only two wire + and GND. The ground on Arduino is shared on all GND. so the USB GND is the same as other ground pins.
Thank you sir for this vedio. Sir I need to find out current drawn from welding machine, there is a shunt resistor with 400A 75 mv. I can't directly connect shunt output to my Arduino Uno because of common ground problems. Once I connected and checked for some time but Arduino got burnout. Can you help me sir?
@@robojax Thank you sir for your valuable time. Actually I am used opamp (op07) differential amplifier for isolation. According to the design it should give output 0v for 0mv and 5v for 75mv. The welding machine give 30mv for around 160A, but when i connect shunt out to opamp the output of opamp rises above 3 or 4v and so it causes error in reading and also error voltage appears on output of opamp when there is no input . The exact output of opamp should be around 1.1 to 1.7v for 30mv. What should I need to do to reduce the hike in output of opamp and also to eliminate voltage when there is no input.
if you've watched the video, I mentioned it. If I find time and interest from people, I will make it. I would have to see if this video get 10,000 view then I know people want this kind of contents.
Maybe I am missing something but it doesn't make sense to me. Even if you use the 100A shunt you'd be basically getting over 1.4A(!) steps on the Arduinos with just using this 75mv shunt.
sorry. I did not understand the 1.4A. I have explained it fully. It would duplicated if I type it again here. with 100A shunt, you should not use to measure anything less than 10A with Arduino UNO.
Hii sir I need 1 help please sir help me please I facing a 1 problem in my project can I measure the 450v dc and 30a current shunt and Arduino it's possible?? And how please help sir
Hi Wrong video . See this How measure DC Voltage and Current and build Energy meter with LCD Display | Lesson 104 th-cam.com/video/oufDb7AtvNk/w-d-xo.html
@@robojax please sir help me how to measure this current with MCU please help me i need isolation with low side and high side I can't connect the Arduino A0 pin derectily to high voltage DC shunt resistor pin
El error del 5% o 10% depende del tipo de resistencia que compre. si es normal si compra una derivación de 50A y la usa para 3A, obtendrá un error del 50%. así que no lo hagas. derivación 5A utilizada para la medición 3A. y use la derivación 50A para 20A a 50A para obtener un resultado excelente.
Hello Very interesting. I am looking for a shunt with a logger! I would like to save volts and amps (time and date) Do you have any idea how to do that? Greeting Daniel
WHen you show the current you are not showing the voltage you are working with. Is it 5 volts at 50 amps or is it 24 volts and measuring 50 amps.. It is hard to tell from your screen what you are proving here. Arduino will only accept up to 5 volts max to the A0 To A7 Pins. So single ended and pushing more than 5 volts will destroy the AD
we are measuring voltage across the shunt resistor. if a shunt is made for 100A, this shunt will output 75mV. I have shown it. We don't care about the voltage we are working. 100V or 500V does not matter because the voltage will never be more than 75mV which is 66 times smaller than 5V. Please watch again. I have explained it fully and why we use shunt and how it works. stay safe.
@@robojax I watched and your rampage that you applied is at 5 volts or less. 30 amps or 200 amps at 5 volts or less is safe with Arduino. anything over five volts will Damage the Arduino. you are not going over 3.5 VOLTS... even if you show 60 amps... on the current power supply through the shunt. try 24 volts and 60 amps and see what happens.
Hi, I can help you only if it is related to the video I have posted here. So please post your question under the relevant video and I will try to replay.
you are welcome. There is no such thing as clone or read. the chip in Arduino board is made by ONE manufacturer. So don't worry you have the right board. You have to post the error show what kind of error you are getting so I look at it.
Be careful when using this on a single power supply. You need the negative side to measure the shunt with Arduino and you cannot use the positive side when on same power source because when the load is disconnected you pump the full voltage into A0! (Or there might be a short circuit - not tested yet - could be possible). That is fine when the voltage is 5V or lower but if it is higher than 5V you can blow up your Arduino! To be on the safe side, always put the shunt at the negative terminal.
Excellent tutorial once again... and thanks for videos with NO MUSIC... so much easier to concentrate on the subject...
You are welcome. I am glad you found them useful.
Wow excelent video tnx
Thanks for this nice video! Is there a voltage limit that we can pass through the shunt? Let say i want to test at 24 volt DC, or maybe at 300volt DC, does i can use the same setup, and same wiring?
you are welcome. when you measure the current, voltage is not of our concern. Yes it will work the same way for both voltages.
I think he is saying measure voltage using a different circuit. Someone else drew attention to the fact that higher volts may be unhealthy for the Arduino.
I do not understand the "adjustment" parameter, but I think we're are asked to believe that this is a fudge for accurately measuring low current when the shunt is rated for higher current.
Sampling and aggregating the data isn't really dealt with and the data is not time stamped because the Arduino does not have a clock!
These are features I am looking for where I have 3 (or more) high end shunts for 3 separate battery banks.
So for multiple readings from multiple shunts (a) choose a 12 bit processor (b) rewrite the code so it samples each shunt in turn (c) optimise the code so it doesn't spend ages reading when there is no current
Do you not seem to recommend measuring voltage at the same time, but with PWM and MPPT this will be varying so I guess there are two analogue input pins to be used?
Amazing video. Thank you very much Ahmad
you are very welcome Tommy.
is it possible to measure amps from 2 different shunt with 2 different voltage source? such as measuring amps from pv to scc & from scc to battery, since it has different voltage values..
yes of course. I have written this library which uses class. you can define different objects for shunt . Learn the meaning of object from this video th-cam.com/video/L6ekl2ABcuY/w-d-xo.html
@@robojax what i actually mean is, how to wire the shunt to the arduino, since arduino only has 1 GND for multiple analog input, and because we are measuring voltage drop on the shunt which there is still a voltage on the negative side of the shunt. And the we connect both negative side of the shunt parallel to the arduino GND. So there would be voltage different on the negative side of the shunt (i.e 30V on pv, 24V on the battery)
@@robojax do you have any solution for that? thank you..
wow. Common ground. that is interesting problem. This won't work as is. External module or chip might solve this. I am not sure. Needs some research.
@@robojax how about using the low-side shunt? is it possible? or do you have any other suggestions? maybe you could make video about that, thanks :D
Thank for the video. Is there a way to amplify the shunt... so that we can measure below 10 Amp? (for a 100A or 200A shunt)
This is the problem of shunt. 5% error makes it hard to use high rated shunt for lower values. You gotta use proper Hall effect sensors. I have videos on those.
Good video 😊
Does this Shunt resistors work for Alternatnig current too? Please i would like to know
See this video Measuring 50A to 200A using Allegro ACS770 Current Sensor with Robojax Arduino Library
th-cam.com/video/sB6EULTix2k/w-d-xo.html
Why are so many shunts labeled as 75 mv? Why not use 100 mv shunts instead? 75 is an odd number. Seems like 100 would be an easer number to work with.
The code I have written will work with any shunt resistor. I have never seen any other. For the past 5 years I have been searching and never saw anything else.
@@robojax You are correct. The 75mv series of shunt resistors appear to be the norm. My guess is that this goes back to the days of analogue current meters providing an easy method of changing current scales. I enjoy watching and learning from your videos and look forward to many more. Should you decide to expand your collection of shunts search on Amazon for 50mv or 100mv base-mounted DC shunts.
Pls how do I modify the code to upload the current value to Thingspeak using esp01 or just using esp8266 instead of Arduino uno?
never heard of Thingspeak
Great job 👍 if read the live current in display it's better
Thanks. I have already made two videos ONE for LCD and the other on LED display. Both has been posted for my Patrons on Patreon.com and in 1 or two weeks I will publish them on youTube.
@@robojax thank you
you are welcome.
thanks for your nice video. can I use this shunt resistor to measure current by an oscilloscope?
If you watch this video fully, you will learn tones of concepts including your question. yes. you can but watch this video fully. I've spent over 2 weeks to make this video.
excellen sir, can i use this 50a or 100a shunt with my Digital multimeter DT830D ?
Yes you can use it with any shunt . But you have to know the values. Is use home law to calculate and enter then in Arduino code.
What would I need to change if I'm using a 100mV Shunt?
With your question you made me watch the video. Just watch the video fully without skipping. I have not said anything extra. The answer is in the video.
wooow, that's gonna be useful, thanks!
Glad you think so!
Can I add some shunt resistor in parallel to its current limit? for example using two 50A shunt resistors in parallel to measure current up to 100A. Is there any advantage or disadvantage for doing that?
yes you can. You have to calculate the value using parallel resistor rule.
@@robojax so the voltage drop must be same right? because its parallel
hello it is not measuning the current below 15 amps what could be the reason for that?
you didn't mention what sunt value you are using. But I have mentioned in the video that if your shunt of 100A has 10% tolerance, then, 10A is not going to be accurate. so calculate the 5% or 10% tolerance. Watch the video fully. I have spent over a week on this project.
@@robojax I am using 200 amps 50 mv shunt resistor, i trying to get the values, but it calculating above 15 amps.
Excellent presentation. There is still something bothering me..that is the ground for the Arduino....say that you have a battery bank of 48 volts made of 8 batteries in series (6 volt each)...hence your ground is just the reference...hence you can connect the ground cable to battery 6...but then the positive (A0)..must be at higher voltagec(battery 7 or 8) ...and obviously using the proper voltage divider to keep the voltage at A0 below 5 volts .... The issue here is that the Arduino has a ground coming from the USB...having another ground at a voltage level (36 volts) ...will that create a problem ??? Thanks.
Hello, if you have 48V, then you have only two wire + and GND. The ground on Arduino is shared on all GND. so the USB GND is the same as other ground pins.
Thank you sir for this vedio. Sir I need to find out current drawn from welding machine, there is a shunt resistor with 400A 75 mv. I can't directly connect shunt output to my Arduino Uno because of common ground problems. Once I connected and checked for some time but Arduino got burnout. Can you help me sir?
use optocoupler to isolate the welding machine. I don' have a video on optocoupler at the moments.
@@robojax Thank you sir for your valuable time.
Actually I am used opamp (op07) differential amplifier for isolation. According to the design it should give output 0v for 0mv and 5v for 75mv. The welding machine give 30mv for around 160A, but when i connect shunt out to opamp the output of opamp rises above 3 or 4v and so it causes error in reading and also error voltage appears on output of opamp when there is no input . The exact output of opamp should be around 1.1 to 1.7v for 30mv. What should I need to do to reduce the hike in output of opamp and also to eliminate voltage when there is no input.
Can we use this to make a energy meter
if you've watched the video, I mentioned it. If I find time and interest from people, I will make it. I would have to see if this video get 10,000 view then I know people want this kind of contents.
how do i measure both plus and minus amps ?
hello, with this code you can't do it. Use this sensor th-cam.com/video/sB6EULTix2k/w-d-xo.html
👏👏👏
🔔 😊.
Great video!
I'm using common GND to control H-Bridge, so it will burn my arduino I guess...
Maybe I am missing something but it doesn't make sense to me.
Even if you use the 100A shunt you'd be basically getting over 1.4A(!) steps on the Arduinos with just using this 75mv shunt.
sorry. I did not understand the 1.4A. I have explained it fully. It would duplicated if I type it again here. with 100A shunt, you should not use to measure anything less than 10A with Arduino UNO.
Hii sir I need 1 help please sir help me please
I facing a 1 problem in my project can I measure the 450v dc and 30a current shunt and Arduino it's possible?? And how please help sir
Hi
Wrong video . See this
How measure DC Voltage and Current and build Energy meter with LCD Display | Lesson 104
th-cam.com/video/oufDb7AtvNk/w-d-xo.html
And search my channel
@@robojax but my voltage is hvdc 450v dc ⚡⚡
@@robojax please sir help me how to measure this current with MCU please help me i need isolation with low side and high side I can't connect the Arduino A0 pin derectily to high voltage DC shunt resistor pin
how can i code in arduino to display negative current to lcd ???
I have not verified it but watch this video someone has done on negative power supply th-cam.com/video/xIV4SodSdkY/w-d-xo.html
É normal não ter precisão?
El error del 5% o 10% depende del tipo de resistencia que compre. si es normal si compra una derivación de 50A y la usa para 3A, obtendrá un error del 50%. así que no lo hagas. derivación 5A utilizada para la medición 3A. y use la derivación 50A para 20A a 50A para obtener un resultado excelente.
can i use this for esp8266?
I have exit it fully. If you watch it many times and learn it you can use it for anything and in any ways
@@robojax ty for the tip
감사합니다
천만에요.
Sir where do you get these components from
Please what the video. I have mentioned them where I am getting them.
Hello
Very interesting. I am looking for a shunt with a logger! I would like to save volts and amps (time and date) Do you have any idea how to do that?
Greeting
Daniel
It could be done in two ways, on microSD card or on cloud server. I have not video for that yet.
Check my latest video dc energy meter
@@robojax It is possible to buy one from you?!
I have nothing for sale
@@robojax
Or can you help me to build such a shunt. I have no idea how to build something like this! :-( let alone program it!
Hi sir, why is the current data not showing
I've run the same tutorial as in the video
Watch explained if the code . You must have disabled it. It can be disabled not to show on serial monitor.
why the analog pin can't be read when connected to a shunt resistor, the data only reads 0
Sir I want to make a radar using stepper motor and a hc sro4 please make
please post this under the stepper motor or HC-SR04 and I will reply. this video is about shunt current.
@@robojax ok
شكراً على مشاركة هذه المعلومات القيمة
عفوا
WHen you show the current you are not showing the voltage you are working with. Is it 5 volts at 50 amps or is it 24 volts and measuring 50 amps.. It is hard to tell from your screen what you are proving here.
Arduino will only accept up to 5 volts max to the A0 To A7 Pins. So single ended and pushing more than 5 volts will destroy the AD
we are measuring voltage across the shunt resistor. if a shunt is made for 100A, this shunt will output 75mV. I have shown it. We don't care about the voltage we are working. 100V or 500V does not matter because the voltage will never be more than 75mV which is 66 times smaller than 5V. Please watch again. I have explained it fully and why we use shunt and how it works. stay safe.
@@robojax I watched and your rampage that you applied is at 5 volts or less. 30 amps or 200 amps at 5 volts or less is safe with Arduino. anything over five volts will Damage the Arduino.
you are not going over 3.5 VOLTS... even if you show 60 amps... on the current power supply through the shunt. try 24 volts and 60 amps and see what happens.
the sketch doesn't work.
You can’t just say it doesn’t work. Please provide error or details
Hi sir i need your help
Hi, I can help you only if it is related to the video I have posted here. So please post your question under the relevant video and I will try to replay.
Thank you for reply sir My question is I am using a clone Ardiuno uno3 Hc340 before it was working fine. Com por is also ok but still error is coming.
you are welcome. There is no such thing as clone or read. the chip in Arduino board is made by ONE manufacturer. So don't worry you have the right board. You have to post the error show what kind of error you are getting so I look at it.
An error occurred while uploading the sketch avrdude: ser_open() : can't set com-state for "\\.\COM3" sir message is showing
press reset on your arduino board
it had also happened to me
ohhh
LOL