// Hx711.DOUT - pin #A1
// Hx711.SCK - pin #A0

#include "Arduino.h"

class Hx711
{
public:
 Hx711(uint8_t pin_din, uint8_t pin_slk);
 virtual ~Hx711();
 long value();
 long nomalvalue(byte times = 32);
 void setOffset(long offset);
 void setScale(float scale = 742.f);
 float gram();

private:
 const uint8_t DOUT;
 const uint8_t SCK;
 long _offset;
 float _scale;
};



Hx711 scale(A1, A0);
Hx711::Hx711(uint8_t pin_dout, uint8_t pin_slk) :
 DOUT(pin_dout), SCK(pin_slk)
{
 pinMode(SCK, OUTPUT);
 pinMode(DOUT, INPUT);

 digitalWrite(SCK, HIGH);
 delayMicroseconds(100);
 digitalWrite(SCK, LOW);

 nomalvalue();
 this->setOffset(nomalvalue());
 this->setScale();
}

Hx711::~Hx711()
{

}

long Hx711::nomalvalue(byte times)
{
 long sum = 0;
 for (byte i = 0; i < times; i++)
 {
 sum += value();
 }

 return sum / times;
}

long Hx711::value()
{
 byte data[3];

 while (digitalRead(DOUT))
 ;

 for (byte j = 3; j--;)
 {
 for (char i = 8; i--;)
 {
 digitalWrite(SCK, HIGH);
 bitWrite(data[j], i, digitalRead(DOUT));
 digitalWrite(SCK, LOW);
 }
 }

 digitalWrite(SCK, HIGH);
 digitalWrite(SCK, LOW);

 data[2] ^= 0x80;

 return ((uint32_t) data[2] << 16) | ((uint32_t) data[1] << 8)
 | (uint32_t) data[0];
}

void Hx711::setOffset(long offset)
{
 _offset = offset;
}

void Hx711::setScale(float scale)
{
 _scale = scale;
}

float Hx711::gram()
{
 long val = (nomalvalue() - _offset);
 return (float) val / _scale;
}

void setup() {

 Serial.begin(9600);

}

void loop() {

 Serial.print(scale.gram()*2, 1);
 Serial.println(" g");

 delay(400);
}