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Example using the SparkFun HX711 breakout board with a scale
By: Nathan Seidle
SparkFun Electronics
Date: November 19th, 2014
License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).
This example demonstrates basic scale output. See the calibration sketch to get the calibration_factor for your
specific load cell setup.
This example code uses bogde's excellent library:
bogde's library is released under a GNU GENERAL PUBLIC LICENSE
The HX711 does one thing well: read load cells. The breakout board is compatible with any wheat-stone bridge
based load cell which should allow a user to measure everything from a few grams to tens of tons.
Arduino pin 2 -> HX711 CLK
3 -> DAT
5V -> VCC
The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.
#include "HX711.h"
#define calibration_factor 11280.00 //This value is obtained using the SparkFun_HX711_Calibration sketch
#define DOUT 11
#define CLK 13
HX711 scale(DOUT, CLK);
void setup() {
scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
void loop() {
Serial.print("Reading: ");
Serial.print(scale.get_units()* 0.453592, 1); //scale.get_units() returns a float
Serial.print(" Kg"); //You can change this to kg but you'll need to refactor the calibration_factor