[SAMR21 New Gameplay] 5. Graphical Programming - Breathing Light 1

dcexpert

[SAMR21 New Gameplay] 5. Graphical Programming - Breathing Light 1 [Copy link]

 

Many GPIOs of SAM R21 support PWM output function, so it is also very easy to implement the breathing light function. You only need to change the duty cycle of the PWM output periodically to change the brightness of the LED.

In graphical programming, the PWM function is implemented through the analog write pin module. Although the name is analog output, it is actually PWM output.

We first create a variable "brightness" to represent the PWM output value. In MakeCode programming, Chinese variable names are allowed, which is easy to use and understand. In the forover (infinite loop), change the brightness of the variable in the cycle. Because the PWM output is 10-bit precision, it must not exceed 1024. A complete program is as follows. Click Download and copy it to the development board, then you can run it.

This content is originally created by dcexpert , a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source.