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windspeed.ino
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windspeed.ino
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/*
This Arduino sketch controls a personal weather station and use an ethernet shield to upload data to wunderground.com.
Details about the weather station can be found at http://www.avanux.de/space/Arduino/Wetterstation.
*/
//////////////
// Variables
//////////////
const long WIND_SPEED_AVG_INTERVAL_SECONDS = 120;
const long WIND_SPEED_GUST_INTERVAL_SECONDS = 600;
volatile uint16_t windSpeedSignalCount;
unsigned long windCalcIntervalBegin;
unsigned long windSpeedAvgIntervalBegin;
float windSpeedAvgValues;
float windSpeedAvgValueSum;
unsigned long windSpeedGustIntervalBegin;
//////////////
// Set up
//////////////
void setupWindSpeed(unsigned long now)
{
attachInterrupt(windSpeedInterrupt, windSignal, RISING);
windSpeed = 0.0;
windSpeedAvg = 0.0;
windSpeedGust = 0.0;
initWindSpeedSignalCount();
windCalcIntervalBegin = now;
windSpeedAvgIntervalBegin = now;
windSpeedGustIntervalBegin = now;
}
void initWindSpeedSignalCount() {
windSpeedSignalCount = 0;
}
//////////////
// Loop
//////////////
void loopWindSpeed(unsigned long now)
{
// calculate wind speed
float intervalSeconds = (now - windCalcIntervalBegin) / 1000.0;
windSpeed = windSpeedSignalCount * 2.4 / intervalSeconds;
#ifdef DEBUG_WS
Serial.print(F("windSpeedSignalCount="));
Serial.print(windSpeedSignalCount);
Serial.print(F(" intervalSeconds="));
Serial.println(intervalSeconds);
#endif
#ifdef INFO_WS
Serial.print(F("wind speed "));
Serial.print(windSpeed);
Serial.println(F(" kph"));
#endif
windSpeedSignalCount=0;
windCalcIntervalBegin = now;
// calculate average
windSpeedAvgValues++;
windSpeedAvgValueSum += windSpeed;
if(now - windSpeedAvgIntervalBegin > WIND_SPEED_AVG_INTERVAL_SECONDS * 1000 || windCalcIntervalBegin > now) {
windSpeedAvg = windSpeedAvgValueSum / windSpeedAvgValues;
#ifdef DEBUG_WS
Serial.print(F("windSpeedAvgValueSum="));
Serial.print(windSpeedAvgValueSum);
Serial.print(F(" windSpeedAvgValues="));
Serial.println(windSpeedAvgValues);
#endif
#ifdef INFO_WS
Serial.print(F("Wind avg("));
Serial.print(WIND_SPEED_AVG_INTERVAL_SECONDS);
Serial.print(F("s): "));
Serial.print(windSpeedAvg);
Serial.println(F(" kph"));
#endif
windSpeedAvgIntervalBegin = now;
windSpeedAvgValues = 0;
windSpeedAvgValueSum = 0;
}
if(now - windSpeedGustIntervalBegin > WIND_SPEED_GUST_INTERVAL_SECONDS * 1000 || windSpeedGustIntervalBegin > now) {
#ifdef INFO_WS
Serial.print(F("Wind gusts ("));
Serial.print(WIND_SPEED_GUST_INTERVAL_SECONDS);
Serial.print(F("s): "));
Serial.print(windSpeedGust);
Serial.println(F(" kph"));
#endif
windSpeedGustIntervalBegin = now;
windSpeedGust = 0.0;
}
if(windSpeed > windSpeedGust) {
windSpeedGust = windSpeed;
windGustDirection = windDirection;
}
}
//////////////
// Functions
//////////////
void windSignal()
{
windSpeedSignalCount++;
}