HX711

The HX711 is a 24-bit precision load cell amplifier and ADC module for weighing and force measurement applications. Two-wire interface (SCK + DT) connects directly to any microcontroller. 2-channel analog input (A and B) with up to 128× programmable gain on channel A. No external amplifiers or dual supply needed.

Pin Configuration:

Analog side:

• E+ / E− — Load cell excitation (+/−)
• A+ / A− — Channel A input (+/−)
• B+ / B− — Channel B input (+/−)

Digital side:

• VCC — 2.7–5V power
• GND — Ground
• DT — Data IO
• SCK — Serial clock

Specifications:

• ADC Resolution: 24-bit
• Input Range: ±40mV differential
• Gain: 128× (Ch A), 32× / 64× (Ch B)
• Output Rate: 10 / 80Hz selectable
• Supply Voltage: 2.7–5V DC
• Current: <10mA
• Dimensions: 24 × 16mm

Applications:

• Digital weighing scales
• Force and pressure measurement
• Industrial load cell interfaces
• Arduino/MCU weight sensing projects