Customer:
I have a Load-cell amplifier HX711 board and I’m wondering how to change the sampling rate to 80 SPS (as advertised). The current 10 SPS is too low for my application.
Originally submitted via email support on 20 August 2025. Migrated to the forum for community visibility.
Soldered Support:
The HX711 breakout supports only 10 Hz or 80 Hz sample rates, selected via the RATE pin (pin 15) — LOW for 10 Hz, HIGH for 80 Hz. This is hardware-controlled only; it’s not changeable via software. On our breakout board, the RATE pin is fixed to GND, so the sample rate is locked.
If you’re willing to modify the breakout board, you can connect the RATE pin (pin 15) to DVDD (pin 16) to set it HIGH and enable 80 Hz mode. DVDD is the chip’s internal regulated digital supply (usually around 3.3V). This will require soldering.
For detailed guidance, check the schematic: Load-cell-ampfilier-HX711-board-hardware-design/OUTPUTS/V1.1.1/Load-cell ampfilier HX711 board Schematics.pdf at main · SolderedElectronics/Load-cell-ampfilier-HX711-board-hardware-design · GitHub
Customer:
I will rewire the RATE pin. Can I wire this pin to VCC (5V) or does it have to be 3.3V?
Soldered Support:
You should connect the RATE pin to VCC, which is your logic “1” on the board. Note that the rate pin is currently connected on the PCB, so you’ll need to carefully remove that connection first. If you don’t, you’ll short GND to VCC, which you want to avoid.
Attachment omitted in migration: image.png