User Manual

pin: the Arduino pin number to set the mode of.

mode:

INPUT , OUTPUT , or INPUT_PULLUP .

Setting ledPin to the output mode.

digitalWrite(ledPin, HIGH);

Description:

Write a

HIGH or a LOW value to a digital pin.

If the pin has been conﬁgured as an OUTPUT with pinMode(), its voltage will be set to the

corresponding value: 5V (or 3.3V on 3.3V boards) for

HIGH , 0V (ground) for LOW .

If the pin is conﬁgured as an INPUT, digitalWrite() will enable (HIGH) or disable (LOW) the internal

pullup on the input pin. It is recommended to set the pinMode() to

INPUT_PULLUP to enable the

internal pull-up resistor. See the Digital Pins tutorial for more information.

If you do not set the pinMode() to OUTPUT, and connect an LED to a pin, when calling

digitalWrite(HIGH), the LED may appear dim. Without explicitly setting pinMode(), digitalWrite()

will have enabled the internal pull-up resistor, which acts as a large current-limiting resistor.

Syntax:

digitalWrite(pin, value)

Parameters:

pin: the Arduino pin number.

value:

HIGH or LOW .

When we set the ledPin as output, HIGH means sending high level to the pin, LED turns on.

digitalWrite(ledPin, LOW);

When we set the led as output, low stands for sending low level to the pin, LED turns oﬀ.

delay(1000);

Description:

Pauses the program for the amount of time (in milliseconds) speciﬁed as a parameter. (There are

1000 milliseconds in a second.)

Syntax:

delay(ms)

Grove Beginner Kit For Arduino®