Wheatstone bridge strain gauge and amplifier setup help

Other Hardware Sensors
1

Hey everyone,

I have a load cell connected to my Uno as in my attached picture.
I am using a 10k resistor which I know is too large but I have to wait until I can get a hold of small resistors.

Can anyone tell me if I am connecting it up correctly?

Thanks,

James

DSC_0080.jpg
DSC_0080.jpg3264×2448 1.42 MB

2

You would need to tell us what sort of amplifier you are using.
There are several relevant tutorials, e.g. Load Cell with an Arduino

3

http://yetticave.blogspot.nl/2014/01/wheatstone-bridge-with-arduino.html

4

Thanks for these links guys.

I am using an 8 pin amp, the INA128. Is he INA125P a more suitable amplifier?

5

Your schematic looks OK. Does the circuit work?
The INA125 includes a stabilized voltage reference that can be used to power bridge sensors, but the INA128 is a better amplifier, with lower offset and bias current.

6

If you're ordering the resistors to set the gain then what you really want is a multiturn pot in the 100-500 ohm range. You really need to be precise in the gain setting to get the best precision from the gauge.