int readRHT03 (const int pin, int *temp, int *rh)
{
static unsigned int nextTime = 0 ;
static int lastTemp = 0 ;
static int lastRh = 0 ;
static int lastResult = TRUE ;
unsigned char buffer [4] ;
// Don't read more than once a second
if (millis () < nextTime)
{
*temp = lastTemp ;
*rh = lastRh ;
return lastResult ;
}
lastResult = maxDetectRead (pin, buffer) ;
if (lastResult)
{
*temp = lastTemp = (buffer [2] * 256 + buffer [3]) ;
*rh = lastRh = (buffer [0] * 256 + buffer [1]) ;
nextTime = millis () + 2000 ;
return TRUE ;
}
else
{
return FALSE ;
}
}
/*
*********************************************************************************
* dht22_read_wiring
*
* Making use of the wiringPiDev library. The function will only return when
* reading the sensor is successful
*
*********************************************************************************
*/
int dht22_read_wiring(int r)
{
//int myTemp = 0;
//int myRelHumidity = 0;
int attempts = 100;
int goodReading = 0;
piHiPri (10);
while (!goodReading && (attempts-- >= 0)) {
usleep(1000*10);
if (maxDetectRead (DHT22PIN, dht22_val)) {
goodReading = 1;
}
//if ( readRHT03(DHT22PIN, &myTemp, &myRelHumidity) == 0) {
// goodReading = 0; //keep looping and try again
//} else {
// goodReading = 1; // stop now that it worked
//}
usleep(1000*500);
}
piHiPri (0);
//printf("Temp: %2.1fF ",(((((float)myTemp/10)*9)/5)+32));
//printf("RH: %2.1f%%\n",((float)myRelHumidity/10));
humidity = (float) (dht22_val[0]*256+dht22_val[1])/10;
temperature = (float) (dht22_val[2]*256+dht22_val[3])/10;
printf("%2d, humidity: %2.1f; temperature: %2.1f; WPI. ", r+1, humidity, temperature);
return(attempts);
}
