46 lines
1.1 KiB
Arduino
46 lines
1.1 KiB
Arduino
|
#include <math.h>
|
||
|
|
|
||
|
|
#define WindSensorPin (2) // The pin location of the anemometer sensor
|
||
|
|
|
||
|
|
volatile unsigned long Rotations; // cup rotation counter used in interrupt routine
|
||
|
|
volatile unsigned long ContactBounceTime; // Timer to avoid contact bounce in interrupt routine
|
||
|
|
|
||
|
|
float WindSpeed; // speed miles per hour
|
||
|
|
|
||
|
|
void setup() {
|
||
|
|
Serial.begin(9600);
|
||
|
|
|
||
|
|
pinMode(WindSensorPin, INPUT);
|
||
|
|
attachInterrupt(digitalPinToInterrupt(WindSensorPin), isr_rotation, FALLING);
|
||
|
|
|
||
|
|
Serial.println("Rotations\tKm/h");
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop() {
|
||
|
|
|
||
|
|
Rotations = 0; // Set Rotations count to 0 ready for calculations
|
||
|
|
|
||
|
|
sei(); // Enables interrupts
|
||
|
|
delay (3000); // Wait 3 seconds to average
|
||
|
|
cli(); // Disable interrupts
|
||
|
|
|
||
|
|
// convert to mp/h using the formula V=P(2.25/T)
|
||
|
|
// V = P(2.25/3) = P * 0.75
|
||
|
|
|
||
|
|
WindSpeed = (Rotations * 0.75) * 1.609344;
|
||
|
|
|
||
|
|
Serial.print(Rotations); Serial.print("\t\t");
|
||
|
|
Serial.println(WindSpeed);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// This is the function that the interrupt calls to increment the rotation count
|
||
|
|
void isr_rotation () {
|
||
|
|
|
||
|
|
if ((millis() - ContactBounceTime) > 15 ) { // debounce the switch contact.
|
||
|
|
Rotations++;
|
||
|
|
ContactBounceTime = millis();
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|