weatherstation/firmware/sensor_wind.ino

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Arduino
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#include "config_user.h"
#include "config.h"
unsigned int anemometerRotations = 0;
ICACHE_RAM_ATTR void _anemometerInterrupt()
{
anemometerRotations++;
#ifdef DEBUG
Serial.print("*");
#endif
}
float wind_speed()
{
anemometerRotations = 0;
int interruptNumber = digitalPinToInterrupt(ANEMOMETER_PIN);
attachInterrupt(interruptNumber, _anemometerInterrupt, RISING);
delay(1000 * WIND_SENSOR_MEAS_TIME_S); // time to measure
detachInterrupt(interruptNumber);
// calculate the speed as km/h
float tmp_speed = (float)anemometerRotations * COUNT_TO_KMH;
#ifdef DEBUG
Serial.print("Windspeed: " + String(tmp_speed));
#endif
return tmp_speed;
}