Has this been resolved (robotshop.com/forum/topic-t14246)? I am having the same problem. The output from the AD8426 does not change as pressure is applied. I am applying pressure that will produce a 6mV signal change but I’m not seeing the voltage at the amplifier output or at the A0 output for channel 1 change. The input wires are connected as shown in the blog entry and I have checked to see if the resistance changes on the load cell. This is the first time I’ve used the board. The output from the amplifier is 1.5 v with the potentiometer set half way between limits.
Can you post a clear picture for your setup ? (Arduino + RB-Onl-38 + Load Cell)
Did you verify in the code that you are reading from A0 pin for Strain 1 ?
Could you try to vary the voltage reference pot for Strain 1 ?
http://i50.photobucket.com/albums/f333/jpiner/IMG_3960_zpsr1pbtuu3.jpg
Checking the output from the load cell while pressing with my thumb produced around a 6 mV change from the no load output of 60 mV. So I would expect a voltage change from the amp of ~3V with the default 100 ohm gain resistors. I checked the output of the AD8426 for both channels and the output stayed constant with varying force on the load cell. I also tried it on channel 2 and there was no change in voltage. Likewise the output from A0 and A1 remain constant when pressure is applied. I also varied the reference voltage for both channels and the results were the same.
