What PWM is, and how a timer makes it
Video lesson · in the full course
PWM (pulse width modulation) switches a pin on and off very fast. The share of time it is on, the duty cycle, sets the average power: how bright an LED is, or how fast a motor turns. A timer makes the signal with no work from the CPU.
What this lesson covers
- Where PWM is used: motors, power supplies, LEDs, servos, audio
- Frequency and duty cycle
- How the counter, CCR and ARR make the signal
- The two formulas you need
By the end, you can work out the timer settings for any PWM frequency and duty cycle with two short formulas.
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