HX711 Load Cell Amplifier

24-bit ADC front-end for strain-gauge load cells and weigh scales. DT/DOUT and SCK are MCU-facing pins; E+/E-/A+/A- connect to the load cell bridge.

Logical pinout · physical placement not verified

VCC
Logic and analog supply. Many breakout boards work from 2.6V-5.5V; use 3.3V logic with ESP32/Pico.
Type · PowerVoltage · 3.3
GND
Common ground
Type · Ground
DT
Data output from HX711 to MCU input; also called DOUT.
Type · GPIO
SCK
Serial clock input from MCU.
Type · SPI
E+
Bridge excitation positive output to load cell.
Type · PowerVoltage · 3.3
E-
Bridge excitation negative output to load cell.
Type · Ground
A+
Differential bridge input positive.
Type · Analog
A-
Differential bridge input negative.
Type · Analog

Pin	Type	Function	Voltage
VCC	Power	Logic and analog supply. Many breakout boards work from 2.6V-5.5V; use 3.3V logic with ESP32/Pico.	3.3
GND	Ground	Common ground
DT	GPIO	Data output from HX711 to MCU input; also called DOUT.
SCK	SPI	Serial clock input from MCU.
E+	Power	Bridge excitation positive output to load cell.	3.3
E-	Ground	Bridge excitation negative output to load cell.
A+	Analog	Differential bridge input positive.
A-	Analog	Differential bridge input negative.

Logical pinout · physical placement not verified

Pin details

8 connections

VCC
Logic and analog supply. Many breakout boards work from 2.6V-5.5V; use 3.3V logic with ESP32/Pico.
PowerVoltage · 3.3
GND
Common ground
Ground
DT
Data output from HX711 to MCU input; also called DOUT.
GPIO
SCK
Serial clock input from MCU.
SPI
E+
Bridge excitation positive output to load cell.
PowerVoltage · 3.3
E-
Bridge excitation negative output to load cell.
Ground
A+
Differential bridge input positive.
Analog
A-
Differential bridge input negative.
Analog

Start wiring

Analog · I2C · 3.3 – 5 V · Bare

Verify supply voltage and logic levels before powering up.

Module pins: VCC, E+, GND, E-, SCK, A+, A-. Schematik maps them to your board in the app.

Force & weight

27 other options

Interlink-style FSRs, strain-gauge load cells with HX711 amplifiers, and ready-made kits like DFRobot's Gravity I2C 1kg scale — from simple touch detection to accurate mass measurement.

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