Arduino internal pull up resistor

Arduino digital input pins

int ledPin = 13;  // LED connected to digital pin 13
int inPin = 7;    // pushbutton connected to digital pin 7
int val = 0;      // variable to store the read value

void setup() {
  pinMode(ledPin, OUTPUT);  // sets the digital pin 13 as output
  pinMode(inPin, INPUT);    // sets the digital pin 7 as input
}

void loop() {
  val = digitalRead(inPin);   // read the input pin
  digitalWrite(ledPin, val);  // sets the LED to the button's value
}

Source: arduino.cc

Arduino internal pull up resistor

Serial.println(sensorValue, DEC);

Source: seeedstudio.com

Arduino internal pull up resistor

pinMode(13, OUTPUT);

Source: seeedstudio.com

Arduino internal pull up resistor

int sensorValue = digitalRead(2);

Source: seeedstudio.com

Arduino internal pull up resistor

Serial.begin(9600);

Source: seeedstudio.com

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