I want to measure the DC voltage that is in the millivolt range of around <1mV to 200mV using electrodes. Is there a cost-effective method of using a certain amplifier that takes these small readings and gives output on the Arduino? I am using an AD623 amplifier and am confused as to how to use it.
The ADS1115 ADC works well.
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Can we assume those are DC voltages? How did you measure the range and with what instrument? What is an AD623 amplifier and why did you choose it and what is your confusion?
What, exactly, is the confusion?
Have you checked out the manufacturer's documentation:
It's an Instrumentation Amplifier:
Do you mean electrodes in a liquid solution?
Not sure what the electrodes is all about but...
That is what I would likely try first before all else.
Ron
Better tell us what the electrodes are, because the ADS1115 or instrumentation solution only works if the voltages of the two electrodes stay within the common mode range.
Leo..
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these are the electrode pads i plan to use: https://amazon.com/AUVON-Replacement-Performance-Non-Irritating-Electrotherapy/dp/B071WRQ9YH/ref=sr_1_1?crid=6Z4PKKMDURBU&keywords=electrode&qid=1689545345&sprefix=electrode%2Caps%2C165&sr=8-1
I want to measure the voltage from my skin using the arduino.
It seems you want an EMG sensor.
Leo..
what if i wanted to measure the electric signals from plant leaves?
You would have to go FAR away from any mains power in order to escape induced signals.
How would I measure voltage from plants using the Arduino using gel-electrode pads? I know they produce very low voltages and would like to know suitable systems for their signals to be read.
I moved your topic to an appropriate forum category @enligio.
In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.
This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.
Thanks in advance for your cooperation.
One could try interfaces designed to measure signals from muscle activity.
I have merged your topics due to them having too much overlap on the same subject matter @enligio.
In the future, please only create one topic for each distinct subject matter and be careful not to cause them to converge into parallel discussions.
The reason is that generating multiple threads on the same subject matter can waste the time of the people trying to help. Someone might spend a lot of time investigating and writing a detailed answer on one topic, without knowing that someone else already did the same in the other topic.
Thanks in advance for your cooperation.
The AD623 is a good Instrumentation amplifier.
You havent said which arduino you are using.
Lets suppose its a UNO wjich has an INTERNAL reference of 1100mV
So you need a gain of 5 (200mV * 5 = 1000mV)
You can set that gain with a resistor Rg of about 24k.
Then connect your output to the Analog input pin
The Arduino I am using is a UNO board.
No problem just connect the in-amp set to a gain of 5, use the 1.1V INTERNAL reference, and run the AD623 from +5 and 0V
It will give you enough data to see whether you need more gain or whatever.
For plant leaves, connect a "reference" electrode to the arduino GND.
You should be VERY carful making good elecrical connections to your body!
Thank you.
I should have specified that I am using this amplifier:https://www.amazon.co.uk/Millivolt-Microvolt-Adjustable-Magnification-Instrumentation/dp/B09KGQZ48Q/ref=sr_1_3?crid=WIJLCTGJRRTA&keywords=ad623&qid=1689879291&sprefix=ad6%2Caps%2C613&sr=8-3&th=1.
I will still use it with the gain of 5 and see if it works.