// Pin Definitions
#define LM35_PIN 34    // LM35 sensor analog input
#define IN1 32      // L298N IN1
#define IN2 33      // L298N IN2
#define ENA_PIN 25      // L298N ENA (PWM motor speed)

// PWM motor 
int motorPWM = 128;  // Set initial motor PWM value (range 0-255)

int SensorVal;
float temperature;   // Temperature value (in Celsius)

void readTeamperatue(void);
void motor_directionspeed(bool in1_val, bool in2_val, int Ena_val);

void setup() {
  // Start serial communication
  Serial.begin(115200);

  // Set motor pins as OUTPUT
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(ENA_PIN, OUTPUT);

  // Set PWM for motor driver
  ledcAttachChannel(ENA_PIN, 30000, 8, 0);

  ledcWrite(ENA_PIN, motorPWM);  // Set initial motor speed (PWM value)
}

void loop() {
  //LM35 read temp from sensor value
  readTeamperatue();

  //motor control
  if(temperature > 300){
    temperature = 300;
  }
  // else if(temperature >150){
  //   motorPWM = 255;
  // }else{
  //   motorPWM = 200;
  // }
  motorPWM=map(temperature, 0, 300, 0, 225);
  motor_directionspeed(1,0,motorPWM);
  
  // wait
  delay(500); 
}

void readTeamperatue(void){
  SensorVal = analogRead(LM35_PIN);
  float Vout = (float) SensorVal * (3.3 / 4095.0);
  temperature = Vout * 100;

  //Print the temperature in Celsius
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print("\xC2\xB0"); // shows degree symbol
  Serial.print("C \n");
}

void motor_directionspeed(bool in1_val, bool in2_val, int Ena_val){
  ledcWrite(ENA_PIN, Ena_val);  // Set initial motor speed (PWM value)
  digitalWrite(IN1, in1_val);
  digitalWrite(IN2, in2_val);
  
  if( (in1_val == 0 && in2_val ==0) || Ena_val == 0){
    Serial.print("Motor off");
  }else if( (in1_val == 1 && in2_val ==1) || Ena_val == 0){
    Serial.print("Motor off");
  }else if( in1_val == 1 && in2_val ==0 && Ena_val> 0){
    Serial.print("Motor on / clockwise direction | ");
    int a = (int)(Ena_val*100)/255;
    Serial.print("Speed: ");
    Serial.print(a);
     Serial.print("%\n");
  }else if( in1_val == 0 && in2_val ==1 && Ena_val> 0){
    Serial.print("Motor on / Anti-clockwise direction | ");
    int a = (int)(Ena_val*100)/255;
    Serial.print("Speed: ");
    Serial.print(a);
     Serial.print("%\n");
  }else{
    Serial.print("Processing");
  }
}