A second disadvantage is you can't leave the output One major disadvantage is that any interrupts will affect the timing, which can cause considerable jitter unless you disable interrupts. In addition, you have full control the duty cycle and frequency. This technique has the advantage that it can use any digital output pin. e.g.ĭelayMicroseconds(100) // Approximately 10% duty cycle 1KHz You can "manually" implement PWM on any pin by repeatedly turning the pin on and off for the desired times. Probably 99% of the readers can stop here, and just use analogWrite, but there are other options that provide more flexibility. (Note that despite the function name, the output is a digital signal.) The analogWrite function provides a simple interface to the hardware PWM, but doesn't provide any control over frequency. The Arduino's programming language makes PWM easy to use simply call analogWrite(pin, dut圜ycle), where dut圜ycle is a value from 0 to 255, and pin is one of the PWM pins (3, 5, 6, 9, 10, or 11). Simple Pulse Width Modulation with analogWrite Generating a modulated signal, for example to drive an infrared LED for a remote control.Providing variable speed control for motors.Providing an analog output if the digital output is filtered, it will provide an analog voltage between 0% and 100%. Briefly, a PWM signal is a digital square wave, where the frequency is constant, but that fraction of the time the signal is on (the duty cycle) can be varied between 0 and 100%. If you're unfamiliar with Pulse Width Modulation, see the tutorial. This article focuses on the Arduino Diecimila and Duemilanove models, which use the ATmega168 or ATmega328. This article explains simple PWM techniques, as well as how to use the PWM registers directly for more control over the duty cycle and frequency. Pulse-width modulation (PWM) can be implemented on the Arduino in several ways.
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