HX711 Load Cell Amplifier

24-bit ADC amplifier for Wheatstone bridge load cells. Used for weight and force measurement via GPIO.

Sensor AVIA Semiconductor HX711 force gpio Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol gpio
Sensor type force
Manufacturer AVIA Semiconductor
Model number HX711
Datasheet url https://cdn.sparkfun.com/datasheets/Sensors/ForceFlex/hx711_english.pdf
Read interval seconds 10

Readings

SlugDevice classUnitRange
weight weight kg 0 to

Wiring

PinRequiredNotes
dt Yes Serial data out from the amplifier.
sck Yes Clock driven by the host.

Supply: 3.3V or 5V

Failure modes

  • Raw output is a signed count with no physical meaning. A tare offset and a scale factor must be established per load cell and stored per device, otherwise the published weight is arbitrary.
  • Bit-banged clocking is sensitive to scheduler preemption. A pulse held high longer than 60 microseconds puts the part into power down and the next read returns garbage.
  • Reading rate is fixed by the RATE pin at 10Hz or 80Hz. The host cannot sample faster than the part converts.
  • Zero drifts with temperature. Long deployments need periodic re-taring at a known empty state.

Entry

Keyhx711
StatusDraft
Revision1
Registry0.3.0
Datasheet Entry on GitHub JSON for agents

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