Hello,
I am trying to use strain gauge to get strain data on my rod. While I bending the rod, the resistance change is too low. Therefore, I use Instrumentation Amplifier for that. I share my design. A0 is reference of my system and A1 is output of the amplifier. When I touch multimeter on the pin heads of A0 and A1 I get correct data but I get 0 for A0 and 0 for A1 in the Arduino. I connect GND with reference of the system then connect it with A0. It is sensible to get 0 from A0 but I did not understand why A1 is 0. Can you help me, please? I get correct results from pin heads but not on Arduino.
Hi, @kokcelimehmet
Welcome to the forum.
Thanks for the pictures.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Please do not use Fritzy images.
Please show in your circuit where you are taking the measurements in the picture.
Thanks.. Tom.. 
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