Pulse Width Modulation
Pulse Width Modulation (PWM) is a technique used to encode a message into a pulsing signal by varying the width (duration) of the pulses while keeping the frequency constant. It is commonly employed in digital systems to control analog devices, such as adjusting the brightness of LEDs, the speed of motors, or generating analog-like voltages from digital outputs. By modulating the duty cycle (the percentage of time the signal is high), PWM effectively simulates variable power levels without continuously varying the voltage.
Developers should learn PWM when working with embedded systems, robotics, or IoT projects that require precise control of power delivery to components like motors, servos, or LEDs. It is essential for applications where energy efficiency is critical, as PWM reduces power loss compared to linear control methods. For example, in Arduino or Raspberry Pi projects, PWM enables smooth dimming of lights or accurate positioning of servo motors without complex analog circuitry.