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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?

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  • \$\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
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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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