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HX711 module has VCC and no VDD

Q&A Forum › Category: ESP32 › HX711 module has VCC and no VDD
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Rashmi Mahadevaiah asked 5 years ago

Hi,

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

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.

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?

Thanks and regards,
Rashmi

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3 Answers
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Sara Santos Staff answered 5 years ago

Hi Rashmi.

I can’t access the circuit from your link, but I think I understand what you want to do.

I have no experience with those modules. So, I can’t tell you for sure how it will behave.

However, in the product description, it states “operation supply voltage range: 2.6 – 5.5v”

So, I guess you should have no problem connecting to 3.3V.

You have to experiment and see the results.

Regards,
Sara

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Rashmi Mahadevaiah answered 5 years ago

Thank you 🙂

Circuit is as follows:
wiring diagram
Can the data and clock pins of the following hx711 module be connected to any GPIO pins?

Thanks and regards,
Rashmi

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Steph answered 5 years ago

Hi Rashmi,

I guess you’ll find all the answers to your questions in this article by Andreas:

Connected Cat Feeder Using a Strain Gauge and an ESP32

And yes, you can safely connect the VCC pin of the HX711 to the 3.3V pin of the ESP32.