Hi, I am using the strain gauge from a kitchen scale and amplifying the signal by using INA128P amplifier and breadboard set up. (Using these instructions). I am using Arduino 1.05 version, and uploaded standard firmata. When I run the firmata test program and then put a load on the sensor, my analog input A0 does not vary. Presuming I have this wired correctly to the breadboard, can you help me understand why I am not seeing the A0 input vary when I put a weight on the scale or how I might troubleshoot? I have hacked the WireBit In/Out connector and used that schematic as a reference.
This is what I see:
Besides testing another load cell, any suggestions?
Here is the set up:
Breadboard from scale to Arduino board ampifying signal with INA128P:
I am thinking this ultimately has to do with having a 3V scale talking to 5V little bits but am unsure how to solve that. Thanks