RPM Tracker

1#include <LiquidCrystal.h> 
2
3LiquidCrystal lcd(12, 11, 6, 5, 4, 3); 
4
5const int hallSensorPin = 2;  // Hall sensor output connected to digital pin 2
6unsigned long lastTime = 0;   // Variable to store the last time the sensor was read
7unsigned long currentTime = 0; // Variable to store the current time
8volatile int pulseCount = 0;   // Counter for the number of pulses
9float rpm = 0;  // Variable to store calculated rotations per minute
10
11void setup() {
12  Serial.begin(9600);  // Initialize serial communication at 9600 baud
13  lcd.begin(16,2);
14  pinMode(hallSensorPin, INPUT);  // Set the sensor pin as input
15  attachInterrupt(digitalPinToInterrupt(hallSensorPin), countPulse, RISING);  // Attach interrupt on rising edge
16}
17
18void loop() {
19  // Calculate RPM every second
20  if (millis() - lastTime > 1000) {
21    detachInterrupt(digitalPinToInterrupt(hallSensorPin));  // Disable interrupt
22    rpm = (pulseCount / 3.0) * 60.0;  // Calculate RPM considering 3 magnets
23    pulseCount = 0;  // Reset pulse count
24    lastTime = millis();  // Update last time
25    attachInterrupt(digitalPinToInterrupt(hallSensorPin), countPulse, RISING);  // Re-enable interrupt
26    Serial.print("RPM: ");
27    Serial.println(rpm);
28
29      
30  lcd.setCursor(1,0);
31  lcd.print("RPM of Spinner");
32  lcd.setCursor(5,1);
33  lcd.print(rpm);
34  lcd.setCursor(0,1);
35  delay(500);
36
37
38  }
39}
40
41void countPulse() {
42  pulseCount++;  // Increment pulse count
43}