arduino pull down resistor code example

Example 1: arduino internal pull up resistor

pinMode(2,INPUT_PULLUP);

Example 2: arduino internal pull up resistor

Serial.println(sensorValue, DEC);

Example 3: arduino internal pull up resistor

int sensorValue = digitalRead(2);

Example 4: arduino pullup

pinMode(pin, INPUT);           // set pin to input
digitalWrite(pin, HIGH);       // turn on pullup resistors