I think the arduino leonardo ADC would be suitable for your application. It supports differential measurement with internal gain settings so you'll barely need any circuitry and the sampeling rate should be more than fine. If you connect a potentiometer to the negative side of the differential ADC and your circuitry to the positive side of the ADC, put in some gain and maybe reduce AREF (if neccesary) you should be able to figure that out. Check out the datasheet of the Atmega32u4 for the details of its ADC. I don't know if there are Arduino libraries available for this but otherwise you have to program the atmega32u4 in low level C.
jasperachtbaan:
If you connect a potentiometer to the negative side of the differential ADC and your circuitry to the positive side of the ADC,
Given that the Atmega32u4 does have a differential input mode - I am not familiar with it - you have nevertheless misunderstood the design of a strain gauge. The strain gauge itself has two outputs which give a differential voltage.
The strain gauge has a voltage range of 1445 mV to 1458 mV, it wouldn't make any sense to directly connect this signal directly to a differential amplifier.
You'll need to offset the negative lead of the amp with 1451.5 mV (half of the range since the ADC measures between - and + Vref in diff mode) to map the entire 10 bit ADC range to the 1445 mV to 1458 mV input.
jasperachtbaan:
The strain gauge has a voltage range of 1445 mV to 1458 mV, it wouldn't make any sense to directly connect this signal directly to a differential amplifier.
You'll need to offset the negative lead of the amp with 1451.5 mV (half of the range since the ADC measures between - and + Vref in diff mode) to map the entire 10 bit ADC range to the 1445 mV to 1458 mV input.
Don't mess with OpAmps and negative voltages. Use a proper strain gauge amplifier. Much easier and almost certainly better results.
jasperachtbaan:
The strain gauge has a voltage range of 1445 mV to 1458 mV, it wouldn't make any sense to directly connect this signal directly to a differential amplifier.
You haven't followed the discussion and clearly do not understand the use of strain gauges.
I repeat - the strain gauge itself has two outputs which give a differential voltage. This automatically provides compensation for temperature and linearity of the strain gauge elements, which would otherwise cause major errors if you attempted to use an external offset.
