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Pulse Width Modulation (PWM) is a technique used in embedded systems to control power delivery to devices such as motors, LEDs, and other actuators. It involves switching the power on and off rapidly to simulate an analog voltage level. This method is efficient and widely used due to its simplicity and effectiveness.
Basics of PWM Control
PWM controls the average voltage supplied to a device by varying the duty cycle, which is the percentage of time the signal is high within a cycle. A higher duty cycle means more power, while a lower duty cycle reduces power. The frequency of the PWM signal determines how quickly the on-off switching occurs.
Implementing PWM in Embedded Systems
Most microcontrollers include hardware modules for generating PWM signals. To implement PWM, developers configure the timer registers to set the desired frequency and duty cycle. Software can then update these registers dynamically to control connected devices.
Applications of PWM Control
- Motor Speed Control: Adjusts the speed of DC motors by varying the duty cycle.
- LED Brightness: Controls brightness levels without changing voltage.
- Power Regulation: Manages power delivery in power supplies and converters.
- Signal Generation: Creates audio signals and other waveforms.