HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 1
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 2
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 3
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 4
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 5
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 6
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 7
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 8
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 9
HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module - Image 10

HX711 Electronic Load Cell Weighing Sensor 2 Channel 24-bit A/D Converter Module

1kg 5kg 10kg 20kg Load Cell Weight Sensor Strain Gauge for Arduino HX711
50kg Load Cell Weight Sensor for Scale Half Bridge HX711 Arduino
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Description

⚖️ HX711 Load Cell Weighing Sensor Module – 2 Channel 24-bit A/D Converter for Arduino & ESP32

Overview

The HX711 Electronic Weighing Sensor Module is a 24-bit dual-channel precision A/D converter designed specifically for load-cell and strain-gauge applications such as electronic scales, pressure sensors, and force measurement systems.
Equipped with an integrated programmable gain amplifier (PGA), selectable between 32, 64, and 128, it delivers exceptional sensitivity and accuracy while remaining cost-effective and easy to integrate.

This compact module provides a simple digital serial interface, making it perfect for projects requiring high-resolution analog-to-digital conversion — including Arduino, ESP32, and Raspberry Pi setups.

⚙️ Key Features

  • 🔹 High precision 24-bit A/D converter (HX711 chip)

  • 🔹 Two selectable differential input channels (A & B)

  • 🔹 Selectable gain amplification: 32, 64, or 128

  • 🔹 Built-in regulator for stable load-cell and analog power supply

  • 🔹 Selectable output rate: 10 SPS or 80 SPS

  • 🔹 Simultaneous 50 Hz and 60 Hz noise rejection

  • 🔹 Low current consumption: <1.5 mA (active), <1 µA (power down)

  • 🔹 Simple 2-wire serial interface — no programming required

  • 🔹 Ideal for load-cell, pressure, or force measurement projects

📊 Specifications

Parameter Description
Model HX711 Load Cell Amplifier Module
Chipset HX711 (24-bit ADC)
Input Channels 2 Differential (Channel A & Channel B)
Selectable Gain 32 / 64 / 128
Output Data Rate 10 SPS or 80 SPS
Operating Voltage 2.6 V – 5.5 V DC
Operating Current <1.5 mA (typical)
Power Down Current <1 µA
Operating Temperature −40 °C to +85 °C
Dimensions 25 × 15 mm
Output Interface Digital Serial (DT & SCK)
Compatibility Arduino, ESP32, ESP8266, Raspberry Pi, STM32, Load Cells, Pressure Sensors

🧩 Applications

✅ DIY electronic scales and weight sensors
✅ Force and pressure measurement systems
✅ Robotics and automation sensing
✅ Smart home weighing applications
✅ IoT-based industrial load monitoring
✅ Strain gauge and bridge sensor amplification

📦 Package Includes

  • 1 × HX711 24-bit Weighing Sensor Amplifier Module

  • 1 × Pin Header Set (unsoldered)

📌 Code Examples & Usage – HX711 24-Bit A/D Load Cell Converter Module

📋 Overview

The HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weighing scales and sensor bridge applications. It’s most commonly paired with strain gauge load cells to read weight or force with high resolution.

The module provides two channels (A and B) and communicates with microcontrollers via a simple 2-wire serial interface (DATA / CLOCK).

Typical applications include:

  • Digital weighing scales

  • Force / pressure measurement

  • Industrial load monitoring

  • Arduino & ESP32 sensor integration

  • Raspberry Pi data logging

⚙ Key Features

  • 24-bit resolution ADC

  • Two differential inputs (Channel A ×128 gain; Channel B ×32 gain)

  • Low noise & high sensitivity

  • Simple 2-wire digital interface

  • Works with 5V (logic) microcontrollers

  • Ideal for load cell, strain gauge, pressure bridge

⚠ IMPORTANT – Load Cells & Power

✔ The HX711 itself does not measure weight directly — it reads tiny voltages from a load cell.

✔ Use a 4-wire or 6-wire load cell bridge (commonly 50kg / 100kg / 200kg / 500kg etc).

✔ Provide stable 5V to the module and load cell supply.

🔌 Pinout

Pin Function
VCC 2.7–5.5V (usually 5V)
GND Ground
DT (DATA) Serial data out
SCK (CLOCK) Serial clock
SCL / SCK Clock (often same pin label)

📌 Some breakout boards also expose:

  • Channel A gain options

  • Channel B input

  • Dual headers for breadboard use

🔌 Wiring – Arduino Example

Connect a typical load cell (4-wire) like this:

Load Cell HX711
Red (E+) E+
Black (E−) E−
White (A−) A−
Green (A+) A+

Then connect the HX711 to Arduino:

HX711 Arduino Uno
VCC 5V
GND GND
DT D3
SCK D2

📌 If your board uses DATA / CLOCK labels, map accordingly.

🛠 Arduino IDE Library Setup

Install via Library Manager:

  • HX711 by Bogde

Arduino IDE → Sketch → Include Library → Manage Libraries → search “HX711”.

🧪 1️⃣ Basic Read Example (Raw Counts)

#include "HX711.h"

#define DT_PIN 3
#define SCK_PIN 2

HX711 scale;

void setup() {
Serial.begin(9600);
scale.begin(DT_PIN, SCK_PIN);
}

void loop() {
if (scale.is_ready()) {
long reading = scale.read();
Serial.print("Raw reading: ");
Serial.println(reading);
} else {
Serial.println("HX711 not ready");
}
delay(500);
}

This shows raw ADC values from the load cell.

🧪 2️⃣ Calibration Example (Convert to Weight)

Calibration is the process of finding a scale factor that converts raw counts into meaningful units (g, kg, lb).

#include "HX711.h"

#define DT_PIN 3
#define SCK_PIN 2

HX711 scale;

float calibration_factor = -7050.0; // adjust this

void setup() {
Serial.begin(9600);
scale.begin(DT_PIN, SCK_PIN);
scale.set_scale(calibration_factor);
scale.tare();
}

void loop() {
Serial.print("Weight: ");
Serial.print(scale.get_units(10), 2); // average 10 readings
Serial.println(" kg"); // or whatever unit you choose
delay(500);
}

How to calibrate:

  1. Upload this sketch

  2. Put a known mass on the load cell (e.g., 5kg)

  3. Adjust calibration_factor until the reading matches the known weight

🧪 3️⃣ Taring (Zeroing) Example

void loop() {
if (Serial.available()) {
if (Serial.read() == 't') {
scale.tare(); // reset to zero weight
Serial.println("Tared");
}
}
Serial.print("Weight: ");
Serial.println(scale.get_units(5), 2);
delay(500);
}

Send t from Serial Monitor to zero the scale.

🧠 Channel Gain Notes

  • Channel A (default): higher gain (×128) — fine for most load cells

  • Channel B: lower gain (×32) — for much larger signals or special sensors

Most breakout boards default to Channel A.

🔋 Power & Noise Tips

✔ Use a stable 5V supply — fluctuations introduce noise
✔ Shorten wiring between load cell and HX711 if possible
✔ For long runs, twist pairs / shield cable from cell to module
✔ Add a small 0.1–1 µF decoupling cap across VCC–GND near the HX711

🧠 Common Issues & Fixes

Issue Cause Fix
Random/noisy readings Noise Shorten wires, shield, add decoupling
Zero reading drift No tare Call scale.tare()
Values too large Wrong calibration Adjust calibration factor
No output Wrong pins Check DT/SCK wiring
ESP32 unstable Power Use 5V regulator

Additional information

Weight 20 g
Dimensions 180 × 260 × 20 mm

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