I'm working on an electronic weight scale using MSP430 and I need your help:
I've written the code using Energia and I've used the HX711 module for testing and everything works just fine. The final project requires everything being on a single PCB, which means I had to give up using the HX711 module (I have to only use the HX711 integrated circuit.) I've remade the schematic that was on the module (see the attachment below.)
I've done some measurements on the circuit and here's what I've discovered:
- The Vsup and Dvdd pin are set to 3.3 V as expected.
- Base has 2.6 V.
- AVDD, VFB and AGND are all equal around 0.7 V.
- Also the VBG is 1.8 V.
The schematic is identical to the one attached, but because AVDD and AGND are equal, the voltage that arrives at the load cell is equal to AVDD - AGND which is zero, so I think this might be the issue; I just need a second opinion from you guys (and ways that I can raise that differential voltage.)