I'm pretty new to this so maybe it could sound ridiculous, but is there any way I can create a voltmeter that can read low voltages (lower that mV) with a load cell amp? I already configured the "Voltmeter" and it reads accurately. It only reads from 0.01v. The photo of the load cell amp will be included, just in case. Can I use this or do I need any other module?
Common mode window of a HX711 is about 1.2volt to 2.9volt.
That usually means that you can't share Arduino ground with "the device you're measuring".
So what are you trying to measure.
Diagram please.
Leo..
Low voltage meters typically require a probe, that is connected directly to the Device Under Test, before long cables go to the meter. I.e. the amplifier has to be detached from the meter. The probe must be very close to the DUT, every millimeter of a wire tends to collect noise from the ambient, that can exceed the voltage to measure.
Without further information I don't know how far a load cell amplifier is applicable in your project. If you already have finished the meter part, you only need a low noise pre-amplifier.
An external A/D, like the ADS1115 (Adafruit.com), could give you a good resolution.
At ground potential, and with a reasonable high impedance.
Leo..