//Student name: Ngan Hoi Sing
//Class: EG524403-1A
//Student no.: 230292338

//https://wokwi.com/projects/382443992301583361

// Program: Ex6B_Analog_Input-E.ino
/*
   Exercise 6 Q2

   Change the program of Ex6B_Analog_Input-E to:
   1. LED flashes at 5Hz at 3.3V to
   2. LED flashes at 1Hz at 0V
*/

#define LED_Out_Pin 25 //Set output position in pin 25
#define SW_In_Pin 15 //Set input position in pin 15
#define VR_In_Pin 34 //Set VR input postion in pin 34
int VRvalue; //Set the VR value

void setup()
{
     // Initialize serial port
        Serial.begin(115200);

     // Set pins
        pinMode(LED_Out_Pin, OUTPUT);
        pinMode(SW_In_Pin, INPUT_PULLUP);
}

void loop()
{
     // Reading
        VRvalue = analogRead(VR_In_Pin);

     // Display
        Serial.print("Raw Sensor reading: ");
        Serial.print(VRvalue);
        VRvalue = map(VRvalue, 0, 4095, 0, 100);  // scale it
        Serial.print("\tScaled Sensor reading: ");
        Serial.println(VRvalue);

     // Set when VRValue is zero or not, The LED flashes 1Hz
        if (VRvalue == 0){
        digitalWrite(LED_Out_Pin, HIGH);
        delay(1000); 
        digitalWrite(LED_Out_Pin, LOW);  
        delay(1000); 
  }
     // Set when VRValue is 3.3V, The LED flashes 5Hz
        else if (VRvalue >= 3.3){  
        digitalWrite(LED_Out_Pin, HIGH);
        delay(200);
        digitalWrite(LED_Out_Pin, LOW); 
        delay(200); 
  }
}