![]() PWM in ArduinoĪrduino UNO has 6 Pins that can be used to generate PWM Signals: 3, 5, 6, 9, 10 and 11. It is measured in percentage and it indicates the voltage between OFF and ON levels (usually 0V and 5V).įrequency of the pulse or the PWM Signal plays an important role as well and it must be sufficiently high than what the device feels its affect. There are two important factors to consider when dealing with PWM Technique: Duty Cycle and Frequency.ĭuty cycle indicates the duration for which the pulse is HIGH over it period. PWM technique can be used to control the brightness of an LED, the speed of a motor or the direction of a servo motor. PWM is a technique where the amount of power delivered to a device can be controlled accurately and efficiently. The technique used to control the brightness of an LED is called Pulse Width Modulation or simply PWM. You might already have performed an experiment with dimming an LED using Arduino, where the brightness of LED is controlled either directly using the program or by interfacing a potentiometer.
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