04 Jun 2024

Load cells are a common sensing element used in various applications such as industrial automation, robotics, and weighing systems. In this article, we will discuss how to interface a load cell with an Arduino microcontroller in a step-by-step manner.

Step 1: Gather the necessary materials
To interface a load cell with an Arduino, you will need the following materials:

  • Arduino microcontroller
  • Load cell
  • HX711 amplifier module
  • Connecting wires
  • Breadboard
  • Power supply

Step 2: Wiring the load cell to the HX711 amplifier module
The load cell usually has four wires: red, black, green, and white. The red and black wires are for power supply (typically 5V), while the green and white wires are for the signal output. Connect the red wire to the E+ terminal on the HX711 module, the black wire to the E- terminal, the white wire to the A- terminal, and the green wire to the A+ terminal.

Step 3: Connecting the HX711 module to the Arduino
Connect the OUT+ and OUT- pins of the HX711 module to the A0 and A1 pins of the Arduino, respectively. Connect the VCC and GND pins of the HX711 module to the 5V and GND pins of the Arduino, respectively.

Step 4: Writing the code
To read the data from the load cell using the Arduino, you will need to write a simple code. Here is an example code snippet to get you started:

#include <HX711.h>

HX711 scale(A0, A1);

void setup() {

void loop() {
Serial.print("Weight: ");

Step 5: Testing the setup
Upload the code to the Arduino and open the serial monitor. You should see the weight readings from the load cell being displayed on the serial monitor. Place different weights on the load cell to see if the readings are accurate.

In conclusion, interfacing a load cell with an Arduino is a relatively simple process that can be achieved with the right materials and a basic understanding of electronics. By following the steps outlined in this article, you should be able to successfully interface a load cell with an Arduino for your project needs.


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