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DHT12.cpp
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/*
DHT12.cpp - Library for DHT12 sensor.
v0.0.1 Beta
Created by Bobadas, July 30,2016.
Released into the public domain.
*/
#include "DHT12.h"
DHT12::DHT12(uint8_t scale,uint8_t id)
{
if (id==0 || id>126) _id=0x5c;
else _id=id;
if (scale==0 || scale>3) _scale=CELSIUS;
else _scale=scale;
}
uint8_t DHT12::read()
{
Wire.beginTransmission(_id);
Wire.write(0);
if (Wire.endTransmission()!=0) return 1;
Wire.requestFrom(_id, (uint8_t)5);
for (int i=0;i<5;i++) {
datos[i]=Wire.read();
};
delay(50);
if (Wire.available()!=0) return 2;
if (datos[4]!=(datos[0]+datos[1]+datos[2]+datos[3])) return 3;
return 0;
}
float DHT12::readTemperature(uint8_t scale)
{
float resultado=0;
uint8_t error=read();
if (error!=0) return (float)error/100;
if (scale==0) scale=_scale;
switch(scale) {
case CELSIUS:
resultado=(datos[2]+(float)datos[3]/10);
break;
case FAHRENHEIT:
resultado=((datos[2]+(float)datos[3]/10)*1.8+32);
break;
case KELVIN:
resultado=(datos[2]+(float)datos[3]/10)+273.15;
break;
};
return resultado;
}
float DHT12::readHumidity()
{
float resultado;
uint8_t error=read();
if (error!=0) return (float)error/100;
resultado=(datos[0]+(float)datos[1]/10);
return resultado;
}