HX711 Load Cell Amplifier

Name: HX711 Load Cell Amplifier
Brand: Avia Semiconductor
Availability: InStock

Avia SemiconductorHX711

24-bit ADC designed for load cells / strain gauges. Differential channels A and B; communicates over a simple 2-wire (DT/SCK) protocol. The heart of most digital scales.

Manufacturer guide / datasheet

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In stock

Specifications

No specs listed.

Pinout

Pin	Name	Functions	Notes
E+	E+	POWER	Load cell excitation +
E-	E-	GND	Load cell excitation -
A-	A-	ADC	Channel A -
A+	A+	ADC	Channel A +
B-	B-	ADC	Channel B -
B+	B+	ADC	Channel B +
GND	GND	GND	Ground
DT	DT	GPIO	Data out (to MCU)
SCK	SCK	GPIO	Clock (from MCU)
VCC	VCC	POWER	2.7-5V supply

Interactive pinout

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HX711

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Starter code

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

Arduino (C++)

Arduino library: HX711 Arduino Library (by Bogdan Necula)

arduino

// HX711 load-cell amplifier — community starter example
#include <HX711.h>

#if defined(ESP32)
  #define DT_PIN 4      // data
  #define SCK_PIN 5     // clock
#else
  #define DT_PIN 3
  #define SCK_PIN 2
#endif

HX711 scale;

void setup() {
  Serial.begin(115200);
  scale.begin(DT_PIN, SCK_PIN);
  scale.tare();                 // zero the empty scale
}

void loop() {
  Serial.println(scale.get_units(5));   // average of 5 readings
  delay(500);
}

MicroPython

MicroPython library: hx711 (robert-hh/hx711)

python

# HX711 load cell (ESP32) — community starter example
# lib: robert-hh/hx711 (hx711.py on the board)
from machine import Pin
from hx711 import HX711
import time

hx = HX711(d_out=Pin(4), pd_sck=Pin(5))   # DT=GPIO4, SCK=GPIO5
hx.tare()

while True:
    print(hx.read())
    time.sleep(0.5)

Wiring

Pin	Arduino Uno R3	ESP32 DevKitC (WROOM-32)	Notes
VCC	+5V	3V3	2.7-5.5 V; match the board logic
GND	GND	GND
DT	D3	GPIO4	Data out
SCK	D2	GPIO5	Clock

Typical uses

Digital scales and weight measurement
Force / strain-gauge sensing