Page Comparison

Digital Sensors

• Digital sensors are (more) straight forward (than Analog)
• No matter what the sensor there are only two states: On and Off
• Signal is always either HIGH (On) or LOW (Off)
• Voltage signal for HIGH will be 5V (more or less) on Arduino Uno. Other Arduinos could use different voltages!
• Voltage signal for LOW will be 0V on most systems

Digital Input – Switch (single throw)

Digital Input – Switch (double throw)

Using Digital Input

• Connect digital input to your Arduino using Pins # 0 – 13 (Avoid pins # 0 & 1 though as they are used for Serial later, and pin #11 and 13 as we are already using it)
• Digital Input needs a pinMode function

pinMode (pinNumber, INPUT);

Make sure to use ALL CAPS for INPUT

• To get a digital reading:

int buttonState = digitalRead (pinNumber);

• Digital Input values are only HIGH (On) or LOW (Off)

http://opensourcehardwarejunkies.com/tutorial-03-digitalread-and-serial-port-communication/

void setup()
{
  pinMode (pinNumber, INPUT);
}

void loop()
{
  int buttonState = digitalRead(2);

  if(buttonState == HIGH)
  {  // do something

  }

  else
  {  // do something else

  }

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