Electrical Engineering Asked by Mika on February 7, 2021
I have four strain gauges (50kg) with 5 wires each (red, black, white, green, yellow) and want too measure weight of a platform. I assume those should be hooked to hx711 load cell amplifier and esp32 MCU if possible.
I see two problems there:
The answer to my question is:
like Dennis Ernst wrote excitation voltage isn't a problem. Seem to work fine when powered from HX711
You need to wire all 4 S type strain gauges in parallel and hook them to HX711.
No need for additional strain gauge power. Yellow wire in my case is strain gauge shield
Proved to be working.
Answered by Mika on February 7, 2021
These loadcells already have a wheatstone bridge in it, you only need to wire it up correctly. According to the homepage the wiring is as follows: Red:power + Black:power - Green:signal + White: signal - Maybe the 5th wire isn't used or not important for you.
The exication voltage shouldn't be a problem. Just put the supply voltage of the HX711 to power+ and power-. The signal+ goes to in+ and signal- to in- of your HX711 module. According to its datasheet the HX711 has a serial protocol so you can wire it up ti the SDIO interface of your ESP32. This datasheet has an example C-driver in it.
Answered by Dennis Ernst on February 7, 2021
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