09 May 2024


The HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weigh scales and industrial control applications. When paired with a load cell, the HX711 can accurately measure weight and output it as a digital signal that can be easily interfaced with a microcontroller like an Arduino. In this article, we will discuss how to interface an HX711 weight sensor with an Arduino for accurate weight measurements.

To interface an HX711 weight sensor with an Arduino, you will need the following components:

1. HX711 weight sensor module
2. Load cell
3. Arduino board
4. Wires for connecting the components
5. A power source for the Arduino

First, connect the load cell to the HX711 weight sensor module. The load cell should have four wires – red, black, white, and green. Connect the red and black wires to the E+ and E- terminals of the HX711 module, respectively. Then, connect the white and green wires to the A+ and A- terminals of the HX711 module, respectively.

Next, connect the HX711 module to the Arduino. Connect the DT pin of the HX711 module to digital pin 2 of the Arduino and the SCK pin to digital pin 3. Make sure to connect the VCC and GND pins of the HX711 module to the 5V and GND pins of the Arduino, respectively.

Now, download and install the HX711 library for Arduino. This library provides functions to read the weight data from the HX711 module. You can find the library on the Arduino website or through the Arduino IDE library manager.

Once the library is installed, you can start writing your Arduino sketch to read the weight data from the HX711 module. Here is a simple example code to read the weight data and display it on the serial monitor:

“`cpp
#include

HX711 scale;

void setup() {
Serial.begin(9600);
scale.begin(2, 3); // DT pin to digital pin 2, SCK pin to digital pin 3
}

void loop() {
Serial.print(“Weight: “);
Serial.println(scale.get_units(), 2); // print the weight data with two decimal places
delay(1000); // wait for one second before reading the weight again
}
“`

Upload the code to your Arduino board and open the serial monitor in the Arduino IDE. You should see the weight data being displayed in grams or kilograms, depending on the calibration of your load cell.

In conclusion, interfacing an HX711 weight sensor with an Arduino is a simple and effective way to accurately measure weight using a load cell. By following the steps outlined in this article, you can easily set up a weight measurement system for various applications such as weigh scales, industrial control systems, and more. If you have any questions or need further assistance, feel free to reach out to Sharp Electronics Pune for expert advice and support.

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