J'ai un programme pour scanner l'adresse des capteur et ils ont tous les deux l'addresse 0x28 : mon programme est le suivant :
#include
void setup() {
#define HYT_ADDR 0x28 // I2C address of the HYT 221, 271, 371 and most likely the rest of the family
Wire.begin(); // Join I2c Bus as master
pinMode(13, OUTPUT); // Set pin 13 to output for status LED
// I2C Pins on the Arduino Uno are A4 for SDA and A5 for SCL
Serial.begin(9600); // Start serial communication for serial console output
}
void loop() {
double humidity;
double temperature;
Wire.beginTransmission(HYT_ADDR); // Begin transmission with given device on I2C bus
Wire.requestFrom(HYT_ADDR, 4); // Request 4 bytes
// Read the bytes if they are available
// The first two bytes are humidity the last two are temperature
if(Wire.available() == 4) {
int b1 = Wire.read();
int b2 = Wire.read();
int b3 = Wire.read();
int b4 = Wire.read();
Wire.endTransmission(); // End transmission and release I2C bus
// combine humidity bytes and calculate humidity
int rawHumidity = b1 << 8 | b2;
// compound bitwise to get 14 bit measurement first two bits
// are status/stall bit (see intro text)
rawHumidity = (rawHumidity &= 0x3FFF);
humidity = 100.0 / pow(2,14) * rawHumidity;
// combine temperature bytes and calculate temperature
b4 = (b4 >> 2); // Mask away 2 least significant bits see HYT 221 doc
int rawTemperature = b3 << 6 | b4;
temperature = 165.0 / pow(2,14) * rawTemperature - 40;
Serial.print(humidity);
Serial.print("% - Temperature: ");
Serial.println(temperature);
}
else {
Serial.println("Not enough bytes available on wire.");
}
blinkWait();
}
void blinkWait() {
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
