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Modes of Operation

Each digital I/O pins of the board can be configured either as input or output. Output pins can be either digital (on / off), setup to generate a PWM at different frequencies or control a WS28XX RGB led.

PWM frequencies and resolution

Not all pins can do PWM. The following table summarizes the characteristics of each pins.

Pin # Frequencies Resolution (bits)

3, 11

31kHz, 122Hz, 31Hz

8

5, 6

31kHz, 122Hz, 31Hz

8

9, 10

31kHz

8

122Hz

16

31Hz

15

WS28XX RGB led

On each pin, up to 16 (chained) leds can be addressed (4 bits). Each color channel of each led is coded on 4 bits. The 16 bits value sent to the corresponding pin is interpreted according to the following table.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Led #

Red

Green

Blue