hyt221.h

#ifndef HYT221_h
#define HYT221_h
 
#define HYT221_ADDR 0x28
#include <Arduino.h>
#include <inttypes.h>
 
uint8_t hyt221_measure(float* temp, float* hum) {
    Wire.beginTransmission(HYT221_ADDR);
    Wire.write(0);
    Wire.available();
    int Ack = Wire.read(); // receive a byte
    delay(100);
 
    Wire.requestFrom(HYT221_ADDR, 4);
    if (Wire.available() > 3) {
        //receive the databytes:
 
        unsigned int valuetemp = 0;
        unsigned int valuecap = 0;
 
        *(((uint8_t*) &valuecap) + 1) = (Wire.read() & 0x3f); //Mask Status Bits
        *((uint8_t*) &valuecap) = Wire.read();
        *(((uint8_t*) &valuetemp) + 1) = Wire.read();
        *((uint8_t*) &valuetemp) = Wire.read();
        Wire.endTransmission();
        /*
 
         *hum=((float)valuecap);
         *temp=((float)valuetemp);
         return 1;
         */
        valuetemp = valuetemp >> 2;
 
        //formate the values
        *hum = ((float) valuecap * 100 / (1 << 14));
        *temp = ((float) valuetemp * 165 / (1 << 14)) - 40;
        return 0;
    }
    return 1;
}
 
#endif