/* ADC and serial

Circuit connections:
Potensiometer_Terminal_1 => Gnd
Potensiometer_Wiper => A0
Potensiometer_Terminal_2 => Vcc

PIN_0 => Serial_RX
PIN_1 => Serial_TX
*/

#define pot_pin A0  //give the name “pot_pin” to PIN_A0
//variable to save data from ADC
int adc_value; //number range 0~1023
float voltage;  //variable to calculate the analog voltage 

//The setup() function initializes and sets the initial values
//It will only run once after each power up or reset
void setup() {
  Serial.begin(9600);
}

//This function loops consecutively
void loop() {
  //read analog voltage and convert to number
  adc_value = analogRead(pot_pin);
  //calculate the analog voltage from adc_number 
  voltage = float(adc_value)/1023*5;
  //print to serial the adc_number and the analog voltage
  Serial.print("ADC number: "); 
  Serial.println(adc_value);
  Serial.print("Voltage = ");
  Serial.print(voltage);
  Serial.println("V");
  //wait for 5 seconds
  delay(5000);
}