HX711 load cell / instrumentation amp

[last updated: 2019-02-03]
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Two versions:
• From SparkFun:

Sparkfun SEN-13879
(link to:) Sparkfun guide



SparkFun SEN-13879
• red and black are + & - exitation voltage to the bridge
  white & green are + & - signal output from bridge.
• I could not find a clear answer to what the actual exitation voltage is from the HX711. Best guess is that it's 4.3v regulated from Arduino 5v supply.
• SparkFun guide says connect both HX711 VCC and VDD to Arduino 5v out
• Ylw wire on SparkFun HX711 board is not connected.
• From China via eBay:


clone HX711 amp


clone HX711 amp


clone HX711 amp
• Note schematic picture showing B+ & B- inputs are not needed for a wheatstone bridge connection
• Note also from "pressure sensor" labelling, this amp (and SparkFun as well) can be used in other instrumentation, small-signal applications.

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