Library for HX711
Dependents: Digitalna_vaga_Loncar
Diff: HX711.cpp
- Revision:
- 0:716e1cbdac61
- Child:
- 1:69e2a99a0875
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HX711.cpp Wed Nov 25 20:21:30 2015 +0000 @@ -0,0 +1,156 @@ +/* + * FILE: HX711.cpp + * + * VERSION: 0.1 + * PURPOSE: HX711 weight library for Nucleo STM32 + * AUTHOR: Bertrand Bouvier + * LICENSE: GPL v3 (http://www.gnu.org/licenses/gpl.html) + * + * DATASHEET: http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf + * URL: + * + * HISTORY: + * 24/05/2015 - Bertrand Bouvier - Original version + * see HX711.h + * + * SPECIAL THANKS: + * Inspiré du travail de Weihong Guan (@aguegu) + * https://github.com/aguegu/Arduino + * http://aguegu.net + * + * Inspiré du travail de bodge + * https://github.com/bogde/HX711 + * + */ + +#include "HX711.h" +#include "mbed.h" + +#define SCALE_VALUE 259.79 //multiple propre à chaque hardware + +HX711::HX711(PinName pinData, PinName pinSck, uint8_t gain) +{ + _pinData = pinData; + _pinSck = pinSck; + + this->setGain(gain); + + DigitalOut sck(_pinSck); + DigitalIn data(_pinData); + + sck = 1; //Initialisation HX711 + wait_us(100); + sck = 0; + + this->setOffset(averageValue(10)); //TARE de la balance + this->setScale(SCALE_VALUE); //Réglage du valeur du SCALE +} + +HX711::~HX711() +{ + +} + +int HX711::averageValue(uint8_t times) //Calcule une moyenne sur plusieurs mesures +{ + int sum = 0; + for (int i = 0; i < times; i++) + { + sum += getValue(); + } + + return sum / times; +} + +int HX711::getValue() //Obtenir la valeur brut du controller +{ + int buffer; + buffer = 0 ; + + DigitalOut sck(_pinSck); + DigitalIn data(_pinData); + + while (data.read()==1) //wait is ready + ; + + for (uint8_t i = 24; i--;) //read 24 bit 1 per 1 and save to buffer + { + sck=1; + + buffer = buffer << 1 ; + + if (data.read()) + { + buffer ++; + } + + sck=0; + } + + for (int i = 0; i < _gain; i++) + { + sck=1; + sck=0; + } + + buffer = buffer ^ 0x800000; + + return buffer; +} + +void HX711::setOffset(int offset) +{ + _offset = offset; +} + +void HX711::setScale(float scale) +{ + _scale = scale; +} + +float HX711::getGram() +{ + long val = (averageValue(2) - _offset); + return (float) val / _scale; +} + +void HX711::setGain(uint8_t gain) +{ + switch (gain) + { + case 128: // channel A, gain factor 128 + _gain = 1; + break; + + case 64: // channel A, gain factor 64 + _gain = 3; + break; + + case 32: // channel B, gain factor 32 + _gain = 2; + break; + } + DigitalOut sck(_pinSck); + sck = 0; + getValue(); +} + +void HX711::powerDown() +{ + DigitalOut sck(_pinSck); + sck = 0; + sck = 1; +} + +void HX711::powerUp() +{ + DigitalOut sck(_pinSck); + sck = 0; +} + +void HX711::tare(uint8_t times) +{ + int sum = averageValue(times); + setOffset(sum); +} + \ No newline at end of file