YourDuinoStarter - 2AnalogValues


This is similar to the sketch "AnalogValue" except two different analog sensors are being used. One is a Potentiometer and the other is a Photoresistor. The sketch displays the values read. The Photoresistor sensor will read higher values for more light intensity. YOU can compare them, but in an automatic system the software would compare them and make some decision.
2AnalogValues_SM.jpg
CONNECTIONS:
  • Potentiometer from +5 to Ground, center to pin A0
  • Photoresistor from +5V to pin A1, 10K from A1 to Gnd.


This is what the Serial Monitor may show:


(Copy the text in the box below and Paste it into a blank Arduino IDE window)
/* YourDuinoStarter Example: 2 Analog Values
 - Reads voltage on Analog Pin 0 and displays value
 - Reads voltage on Analog Pin 1 and displays value 
 - If light level is low enough, turns LED on.
 - SEE the comments after "//" on each line below
 - CONNECTIONS:
 - Potentiometer from +5 to Ground, center to pin A0
 - Photoresistor from +5V to pin A1, 10K from A1 to Gnd.
 - V1.02 02/11/13
 Questions: terry@yourduino.com */

/*-----( Import needed libraries )-----*/
//none
/*-----( Declare Constants and Pin Numbers )-----*/
#define potPin    A0  // In separate group of pins
#define photoPin  A1  // In separate group of pins
#define ledPin    13  // The onboard LED
/*-----( Declare objects )-----*/
//none
/*-----( Declare Variables )-----*/
int  potValue;  // Hold the values read in
int  photoValue;

void setup()   /****** SETUP: RUNS ONCE ******/
{
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);   //Start sending to "Serial Monitor"
  Serial.println("YourDuinoStarter Example: Show Analog Value.");
}//--(end setup )---


void loop()   /****** LOOP: RUNS CONSTANTLY ******/
{
  potValue   = analogRead(potPin); //Read value
  photoValue = analogRead(photoPin); //Read value  
  Serial.print("POT VALUE = ");
  Serial.print(potValue,DEC); // Print value 
  Serial.print("  PHOTORESISTOR VALUE = ");
  Serial.println(photoValue,DEC); // Print value   
  
/*-( Test the voltage. If it's < the light level set by the pot, turn on the Light )-*/    
  if ( photoValue < potValue ) 
  {
    digitalWrite(ledPin, HIGH);
    Serial.println("Getting darker: Light turned ON");
  } 
  else
  {
    digitalWrite(ledPin, LOW);    
    Serial.println("Getting Lighter: Light turned OFF");    
  }  
  
  delay(4000);     // Wait 4 seconds
}//--(end main loop )---

/*-----( Declare User-written Functions )-----*/
//none
//*********( THE END )***********