69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
// Pin setup
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const int pwmPin = 9; // PWM output to transistor base
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const int tachPin = 2; // Tach input from fan
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const int buttonPin = 7; // Pin of the button
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volatile unsigned long tachCount = 0;
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unsigned long lastTachCount = 0;
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unsigned long lastMillis = 0;
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int rpm = 0;
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int speed_percent = 0;
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int speed = 255 - (speed_percent * 2.55); // Valore di default
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// Interrupt routine for tachometer
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void tachISR() {
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tachCount++;
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}
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void setup() {
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pinMode(pwmPin, OUTPUT);
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pinMode(tachPin, INPUT_PULLUP);
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pinMode(buttonPin, INPUT_PULLUP);
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attachInterrupt(digitalPinToInterrupt(tachPin), tachISR, FALLING);
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Serial.begin(9600);
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}
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bool lastButtonState = HIGH;
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unsigned long lastDebounceTime = 0;
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const unsigned long debounceDelay = 200; // ms
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void loop() {
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// // Imposta la velocità da seriale se disponibile
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// if (Serial.available() > 0) {
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// speed_percent = Serial.parseInt();
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// if (speed_percent >= 0 && speed_percent <= 100) {
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// speed = map(speed_percent, 0, 100, 255, 0); // Converti percentuale in valore PWM (0-255)
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// Serial.print("Nuova velocità impostata: ");
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// Serial.print(speed_percent);
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// Serial.println("%");
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// }
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// }
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// Imposta la velocità se il pulsante è premuto
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bool buttonState = digitalRead(buttonPin);
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if (buttonState == LOW && lastButtonState == HIGH && (millis() - lastDebounceTime) > debounceDelay) {
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speed_percent = speed_percent + 10;
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if (speed_percent > 105) {
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speed_percent = 0;
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}
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speed = map(speed_percent, 0, 100, 255, 0);
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lastDebounceTime = millis();
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}
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lastButtonState = buttonState;
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analogWrite(pwmPin, speed);
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// Calcola RPM ogni secondo
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if (millis() - lastMillis >= 1000) {
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// La ventola 4 pin di solito genera 2 impulsi per giro
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rpm = (tachCount - lastTachCount) * 30; // 2 impulsi/giro, 60 sec/min
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lastTachCount = tachCount;
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lastMillis = millis();
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Serial.print("Velocità impostata: ");
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Serial.print(speed_percent);
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Serial.print("% | RPM letti: ");
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Serial.println(rpm);
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}
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} |