ปุ่มหลายปุ่มบนขา1 Analog

หลักการทำงาน

ขาanalogจะรับค่าไฟจากสวิท ่งสวิทนี้นจะมีค่าความต้านทานต่างกันจึงทำให้แยกแยะป่มุ

ได้

CODE
/* Multiple buttons on one Analog pin Example
   Use 4 buttons to one bus to control 4 LEDs
   Dev: Vasilakis Michalis // Date: 1/7/2015 // www.ardumotive.com */
  
//Constants
const int yellowLed = 2;
const int redLed    = 3;
const int blueLed   = 4;
const int greenLed  = 5;
//Variables
int buttonValue; //Stores analog value when button is pressed

void setup()
{
  pinMode(yellowLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
}
void loop()
{
  buttonValue = analogRead(A0); //Read analog value from A0 pin
 
  //For 1st button:
  if (buttonValue>=1010 && buttonValue<=1015){
    digitalWrite(yellowLed, HIGH);
  }
  //For 2nd button:
  else if (buttonValue>=1000 && buttonValue<=1008){
    digitalWrite(redLed, HIGH);
  }
  //For 3rd button:
  else if (buttonValue>=990  && buttonValue<=998){
    digitalWrite(blueLed, HIGH);
  }
  //For 4th button:
  else if (buttonValue>=870  && buttonValue<=880){
    digitalWrite(greenLed, HIGH);
  }
  //No button pressed, turn off LEDs
  else{
    digitalWrite(yellowLed, LOW);
      digitalWrite(redLed, LOW);
      digitalWrite(blueLed, LOW);
      digitalWrite(greenLed, LOW);
  }
  delay(100);
}