/*Header
  Writing a code to measure the voltage --> Use Analog Pin A0
    within an LED-resistor ciruit
    can measure before LED, after resistor, and between LED-Resistor
    With measured voltage we can use Ohms law (V = IR)
    To calcualte
      Current through component/circuit
      Voltage drop across any component
  Wire up three different LED-resistor circuits
    1 Red LED (Digital Pin 5) - 220 Ohm
    1 Red LED (Digital Pin 6) - 1k Ohm
    1 Red LED (Digital Pin 7) - 10 kOhm
*/

//Global variable and pins
int VoltReading; //integer called volt reading with no initial value

int LEDPin1 = 5;//integer for each LED pin being used
int LEDPin2 = 6;
int LEDPin3 = 7;


void setup() {
  // put your setup code here, to run once:

  //how are we using what pins
  pinMode(LEDPin1,OUTPUT);//hey arduin LEDpin1 ~5 is an actuator
  pinMode(LEDPin2,OUTPUT);
  pinMode(LEDPin3,OUTPUT);
  //can do pinMode for analog pin BUT all analog pins by default are inputs

  //for debuggin ALWAYS start our serial monitor
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

  //turn LEDs on
  digitalWrite(LEDPin1,HIGH);//turn pin 1 on --> give it 5v
  digitalWrite(LEDPin2,HIGH);
  digitalWrite(LEDPin3,HIGH);

  //probe our circuit --> check some voltages
  VoltReading = analogRead(A0);//read voltage value from A0 pin and assign to variable
  //gotta print to see and debug
  Serial.println(VoltReading);
  delay(500);//1/2s 
  
  //expected volts before LED = 5V --> print 1023
  //expected volts after resistor = 0V --> print 0
  //expected volts after LED = 3.3V --> ~700 Evan 552

  //limitation of simulation --> Wokwi
  //Wokwi does not simulate current --> 0V after ANY component


}