Clém'S
82 lines
1.2 KiB
C++
Executable File
82 lines
1.2 KiB
C++
Executable File
/*
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* Hx711.cpp
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*
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* Created on: Oct 31, 2012
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* Author: agu
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*/
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#include "hx711.h"
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Hx711::Hx711(uint8_t pin_dout, uint8_t pin_slk) :
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_pin_dout(pin_dout), _pin_slk(pin_slk)
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{
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pinMode(_pin_slk, OUTPUT);
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pinMode(_pin_dout, INPUT);
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digitalWrite(_pin_slk, HIGH);
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delayMicroseconds(100);
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digitalWrite(_pin_slk, LOW);
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averageValue();
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this->setOffset(averageValue());
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this->setScale();
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}
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Hx711::~Hx711()
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{
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}
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long Hx711::averageValue(byte times)
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{
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long sum = 0;
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for (byte i = 0; i < times; i++)
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{
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sum += getValue();
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}
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return sum / times;
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}
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long Hx711::getValue()
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{
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byte data[3];
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while (digitalRead(_pin_dout))
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;
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for (byte j = 3; j--;)
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{
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for (char i = 8; i--;)
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{
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digitalWrite(_pin_slk, HIGH);
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bitWrite(data[j], i, digitalRead(_pin_dout));
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digitalWrite(_pin_slk, LOW);
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}
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}
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digitalWrite(_pin_slk, HIGH);
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digitalWrite(_pin_slk, LOW);
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data[2] ^= 0x80;
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return ((uint32_t) data[2] << 16) | ((uint32_t) data[1] << 8)
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| (uint32_t) data[0];
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}
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void Hx711::setOffset(long offset)
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{
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_offset = offset;
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}
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void Hx711::setScale(float scale)
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{
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_scale = scale;
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}
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float Hx711::getGram()
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{
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long val = (averageValue() - _offset);
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return (float) val / _scale;
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}
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