wiring diagram

(Image source and more details: circuitio.io)

I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the documentation

HX711 module has Operating Voltage: 2.7V to 5VDC and Operating current: <10 mA

Sparkfun HX711 has VCC and VDD.

VCC is the analog voltage to power the load cell. VDD is the digital supply voltage used to set the logic level.
In many cases, you can just short VCC and VDD together. If your microcontroller uses 3.3V logic however, you'll want to connect VCC to 5V and VDD to 3.3V.

(Source: SparkFun - Load Cell Amplifier HX711 Breakout Hookup Guide)

Amazon HX711 has only VCC and no VDD. Therefore, can I connect LoadCellHX711SF VCC to NodeMCU1 3V3 instead of connecting LoadCellHX711SF VDD to NodeMCU1 3V3?

  • \$\begingroup\$ Note that you have posted a wiring diagram. A schematic diagram (where each component is represented by a symbol with pin names) is much more useful and what we prefer here. \$\endgroup\$ – Transistor Dec 2 at 21:37

I use this "no name" module in 3V3 without problem. You can safely connect VCC to 3V3. Heere is the reverse to compare to the HX711 datasheet

enter image description here


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