@LeoWhy would the ADS1115 be a poor choice? Granted not great but why would we say a poor choice?Ron
"It has a supply voltage of 5volt" is a wrong assumption.Load cells don't have a fixed supply voltage. The datasheet only recommends 5volt.The HX711 works with an excitation (load cell supply) voltage of 4.3volt, which is perfectly fine.A HX711 board does need a 5volt supply for that,and if you're going to use a 3.3volt processor (WeMos, ESP32 etc.), then you need a Sparkfun HX711 board with separate 5volt analogue and 3.3volt digital supply connections. @Ron_BlainAn ADS1115 (absolute A/D) is a poor choice for a load cell (ratiometric sensor).Leo..
I am not sure on the amps of the load cells
I wouldn't worry about that. A few mA...A cellphone powerbank should be fine. Even a small-ish 5A type could keep it running for 24H+.Leo..
If you go with the HX711 modules they provide excitation as was covered earlier. Load cells draw, as was mentioned, a few mA of excitation current. Ron
Cheers, so just to confirm the load cells draw power from the HX177 modules. Hence the power bank connected to the WEMOS provides power through the modules to the load cells. So two sources of power aren't needed just one?
Correct.Just make sure you connect the analogue supply (VCC) of the HX711 to the 5volt pin of the WeMos, and the digital supply (VDD) of the HX711 to the 3.3volt pin of the WeMos.Leo..
Yes and that is important. Make sure the HX711 modules you get allow Analog and Digital supplies. The early boards (modules) didn't and you needed to cut a run on the board for dual supply use. This was also covered previously in this thread.Ron
...the HX711 is an I2C device and it has an address.