CODE AND CIRCUIT DIAGRAM OF RPM CONTROLLER PROJECT

 #include <LiquidCrystal.h>

LiquidCrystal lcd(2,3,4,5,6,7);

const int hallPin=8;

const unsigned long sampleTime=1000;

const int maxRPM = 10000; 

int volume_pin = A0;

int read_ADC;

int pwm_pin = 11;

int duty_cycle;

int duty_cycle_lcd;

 

void setup() {

  pinMode(hallPin,INPUT);

  pinMode(volume_pin, INPUT);

  pinMode(pwm_pin, OUTPUT);

  lcd.begin(16,2);  

  lcd.setCursor(0,0);

  lcd.print(" JAHANZEB ");

  lcd.setCursor(0,1);

  lcd.print("  Subscribe ");

  delay(2000);

  lcd.clear();

}

 

void loop() {     

int rpm=getRPM();

read_ADC = analogRead(volume_pin);

duty_cycle = map(read_ADC, 0, 1023, 50, 255);  

duty_cycle_lcd = map(read_ADC, 0, 1023, 0, 100); 

if(duty_cycle_lcd>0){ 

analogWrite(pwm_pin, duty_cycle); 

}else{digitalWrite(pwm_pin, LOW);}

lcd.setCursor(0,0);

lcd.print("Duty Cycle: ");

lcd.print(duty_cycle_lcd); 

lcd.print("%  ");

lcd.setCursor(0,1); 

lcd.print("   RPM: ");

lcd.print(rpm); 

lcd.print("   ");

delay(10);

}

int getRPM(){

int kount=0;

boolean kflag=LOW;

unsigned long currentTime=0;

unsigned long startTime=millis();

while (currentTime<=sampleTime){

if(digitalRead(hallPin)==HIGH){kflag=HIGH;}

if(digitalRead(hallPin)==LOW && kflag==HIGH){

kount++;

kflag=LOW;

}

currentTime=millis()-startTime;

}

int kount2rpm = int(30000./float(sampleTime))*kount;

return kount2rpm;

}