For specific reasons I need to switch for my project from a digital loadcell amplifier like the HX711 to an analog one. So I found the ina-333 amplifier board on Ali: https://s.click.aliexpress.com/e/cmrnr5P3
On the sensor side, I connected GND and Vcc to a loadcell, Vin+ and Vin- to the loadcell differential voltage ports.
On the supplier side, I connected GND to GND and Vref, 3.3V source to 3.3V and took reading from Vout.
The problem I encounter is, the board immediately starts getting hot and the output voltage doesn't change after applying force to the loadcell.
Instrumentation opamps should not get hot, so there is something very wrong.
Post a connection diagram, and a picture.
Not using a HX711 will seriously degrade stability and resolution.
Which Arduino are you using.
Vref should probably be connected to some reference voltage (not to 3.3volt or ground).
Leo..
Here is a photo of the actual sensor setup. Measured the resistance of the load cell between (GND, Vin+) and (VCC, Vin-, Vin+, Vin-)) and received values of (2, 1, 1, 2) kOhm, which seem plausible to me.
It seems as if you have connected the load cell to the wrong side of the board.
The 5-pin chip is the voltage regulator, the 8-pin chip is the INA333.
Leo..
