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.. highlight:: cpp
.. _wirish-pwmwrite:
pwmWrite()
==========
Writes a :ref:`PWM wave <pwm>` to a pin. You can use this to make an
LED get brighter or dimmer, control a servomotor, etc. After a call to
pwmWrite(), the pin will output a steady square wave with the given
duty cycle. You can change the duty cycle later by calling pwmWrite()
again with the same pin and a different duty.
.. contents:: Contents
:local:
Library Documentation
---------------------
.. doxygenfunction:: pwmWrite
Example
-------
Sets the output to the LED proportional to the value read from the
potentiometer (adapted for Maple from the Arduino `analogWrite()
reference <http://www.arduino.cc/en/Reference/AnalogWrite>`_)::
int ledPin = 13; // LED connected to pin 13 (Maple)
int analogPin = 3; // potentiometer connected to analog pin 3
int val = 0; // variable to store the read value
void setup() {
pinMode(ledPin, OUTPUT); // sets the LED pin as output
pinMode(analogPin, PWM); // sets the potentiometer pin as PWM
// output
}
void loop() {
val = analogRead(analogPin); // read the input pin
analogWrite(ledPin, val / 16); // analogRead values go from 0 to 4095,
// analogWrite values from 0 to 65535
}
See Also
--------
- :ref:`Maple PWM tutorial <pwm>`
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