arduino:analog_io:analogwrite
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arduino:analog_io:analogwrite [2013/02/15 18:10] 127.0.0.1 external edit |
arduino:analog_io:analogwrite [2024/02/16 01:04] (current) |
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| ====Description ==== | ====Description ==== | ||
| - | Writes an analog value ([[Tutorial/PWM | PWM wave]]) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to **analogWrite()**, the pin will generate a steady square wave of the specified duty cycle until the next call to **analogWrite()** (or a call to **digitalRead()** or **digitalWrite()** on the same pin). The frequency of the PWM signal is approximately 490 Hz. | + | Writes an analog value ( PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to **analogWrite()**, the pin will generate a steady square wave of the specified duty cycle until the next call to **analogWrite()** (or a call to **digitalRead()** or **digitalWrite()** on the same pin). The frequency of the PWM signal is approximately 490 Hz. |
| On most Arduino boards (those with the ATmega168 or ATmega328), this function works on pins 3, 5, 6, 9, 10, and 11. On the Arduino Mega, it works on pins 2 through 13. Older Arduino boards with an ATmega8 only support analogWrite() on pins 9, 10, and 11. | On most Arduino boards (those with the ATmega168 or ATmega328), this function works on pins 3, 5, 6, 9, 10, and 11. On the Arduino Mega, it works on pins 2 through 13. Older Arduino boards with an ATmega8 only support analogWrite() on pins 9, 10, and 11. | ||
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| Sets the output to the LED proportional to the value read from the potentiometer. | Sets the output to the LED proportional to the value read from the potentiometer. | ||
| - | (:source lang=arduino:) | + | <code arduino> |
| int ledPin = 9; // LED connected to digital pin 9 | int ledPin = 9; // LED connected to digital pin 9 | ||
| int analogPin = 3; // potentiometer connected to analog pin 3 | int analogPin = 3; // potentiometer connected to analog pin 3 | ||
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| analogWrite(ledPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255 | analogWrite(ledPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255 | ||
| } | } | ||
| - | (:sourceend:) | + | </code> |
| ====See also ==== | ====See also ==== | ||
| - | * [[arduino:analog io:AnalogRead]]() | + | * [[arduino:analog io:AnalogRead]] |
| - | * [[arduino:analog io:AnalogWriteResolution]]() | + | * [[arduino:analog io:AnalogWriteResolution]] |
| - | * [[Tutorial/PWM | Tutorial: PWM]] | + | |
| Source: arduino.cc | Source: arduino.cc | ||
on the occasion of the current invasion of Russia in Ukraine
arduino/analog_io/analogwrite.1360948235.txt · Last modified: 2024/02/16 01:02 (external edit)
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