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Arduino interfacing hx711 load cell with oled display

In this article we will learn how to Interface Arduino with HX711 Load cell.

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Arduino interfacing hx711 load cell with oled display

Things used in this project

Hardware components

1. Arduino
×1
2. HX711
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3. O Led
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4. Load cell
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Software apps and online services

Arduino IDE
Arduino IDE

Story

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Schematics

arduino interfacing hx711 load cell with Oled display diagram

Code

arduino interfacing hx711 load cell with Oled display code

Arduino
#include "HX711.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define DOUT 3
#define CLK 2

HX711 scale;

float weight;
float calibration_factor = 419640; // Calibration factor

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
Serial.begin(9600);
Serial.println("HX711 calibration sketch");
Serial.println("Remove all weight from scale");
Serial.println("After readings begin, place known weight on scale");
Serial.println("Press + or a to increase calibration factor");
Serial.println("Press - or z to decrease calibration factor");

scale.begin(DOUT, CLK);
scale.set_scale();
scale.tare(); // Reset the scale to 0
long zero_factor = scale.read_average(); // Get a baseline reading

Serial.print("Zero factor: ");
Serial.println(zero_factor);

display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
delay(2000);
display.clearDisplay();
display.setTextColor(WHITE);
}

void loop() {
scale.set_scale(calibration_factor); // Adjust to this calibration factor
Serial.print("Reading: ");
weight = scale.get_units(5);
if (weight < 0) {
weight = 0.00;
}

Serial.print("Kilogram:");
Serial.print(weight);
Serial.print(" Kg");
Serial.print(" calibration_factor: ");
Serial.print(calibration_factor);
Serial.println();

display.clearDisplay();
display.setTextSize(3);
display.setCursor(0, 0);
display.print("Weight:");
display.setTextSize(3);
display.setCursor(0, 35);
display.print(weight);
display.setTextSize(3);
display.setCursor(75, 35);
display.print("Kg");
display.display();
delay(100);
}
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