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Ligne 133 :
Ligne 133 : − + − The onboard LED is tied to the GPIO 25. And that GPIO 25 can also be controled with PWM.+ − + + + + + + +
→PWM Output
[[Fichier:ENG-CANSAT-FEATHER-PICO-pwm-01.png]]
[[Fichier:ENG-CANSAT-FEATHER-PICO-pwm-01.png]]
The average voltage of PWM signal depend on the duty cycle: Vavg = 3.3V * Th / P
The average voltage (average power) of PWM signal depend on the duty cycle: Vavg = 3.3V * Th / T
[[Fichier:ENG-CANSAT-FEATHER-PICO-pwm-02.png|800px]]
Thank to PWM we can control the effective luminosity of the LED by setting-up the duty cycle of the PWM signal.
Obviously, a 0% duty cyle is equivalent to a LOW signal whereas a 100% duty cycle is a HIGH signal.
In the following example, we will use PWM to dim the light on the onbloard LED.
The onboard LED is tied to the GPIO 25 (and PWM will work there as with other GPIOs).
Thank to PWM we can effectively control the LED luminosity (very low duty cycle will dim the light while highest duty cycle will make it brightest).
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