Getting Started with ESP32 Load Cell Using HX711: A Step-by-Step Guide


If you’re looking to explore the world of load cells and how they can be integrated with ESP32 microcontrollers, then you’re in the right place. In this step-by-step guide, we will walk you through the process of setting up an ESP32 with an HX711 load cell amplifier. By the end of this guide, you’ll have a fully functional system that can accurately measure weight or force.

To begin this project, you will need the following materials:

1. ESP32 development board
2. HX711 load cell amplifier
3. Load cell (such as a 10kg or 50kg load cell)
4. Breadboard
5. Jumper wires
6. Software: Arduino IDE

Step 1: Wiring the Hardware
Start by wiring up your components according to the following diagram:

– Connect the DT pin of the HX711 to GPIO pin 15 of the ESP32.
– Connect the SCK pin of the HX711 to GPIO pin 13 of the ESP32.
– Connect the VCC pin of the HX711 to the 3.3V pin of the ESP32.
– Connect the GND pin of the HX711 to the GND pin of the ESP32.
– Connect the red wire of the load cell to the E+ pin of the HX711.
– Connect the black wire of the load cell to the E- pin of the HX711.
– Connect the white wire of the load cell to the A- pin of the HX711.
– Connect the green wire of the load cell to the A+ pin of the HX711.

Step 2: Installing the Required Libraries
Open the Arduino IDE and go to Sketch > Include Library > Manage Libraries. Search for and install the following libraries:

– HX711 by Bogde
– ESP32 by Espressif Systems

Step 3: Programming the ESP32
Copy and paste the following code into your Arduino IDE:

“`cpp
#include “HX711.h”

#define DOUT 15
#define SCK 13

HX711 scale(DOUT, SCK);

void setup() {
Serial.begin(9600);
scale.set_scale(2280.f);
scale.tare();
}

void loop() {
Serial.println(scale.get_units(), 1);
delay(1000);
}
“`

This code initializes the HX711 library, sets the scale factor to 2280, and zeros out the scale. In the loop, it continuously reads the weight and prints it out to the serial monitor.

Step 4: Uploading and Testing
Upload the code to your ESP32 and open the serial monitor. You should see real-time weight readings from your load cell. Place an object on the load cell and observe the changes in the readings.

With this setup, you can now further enhance your project by adding functionalities such as data logging, data visualization, WiFi connectivity, and more. Load cells have a wide range of applications in fields like industrial automation, robotics, and IoT projects.

In conclusion, setting up an ESP32 with an Hjson load cell is a straightforward process that can open up a world of possibilities for your projects. With accurate weight measurements at your fingertips, the sky’s the limit in terms of what you can achieve. So go ahead, start experimenting, and see where your creativity takes you!

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