The second version of the development board – I will call it BI2 from now on – has some improvements:
- I used more components of the original design (Adafruit Feather Huzzah) instead of comparable (and cheaper) Seeedstudio Open Part Library components. The reason for this is easy. The Adafruit design is reliable and approved. No need for designing your own circuits, no risk to fail. (But also no fun in inventing new circuits.)
- I added LED light – the WS2812B – which is a colourful LED (16 Mill. colours). They are commonly known as Adafruit Neopixel – a strip or a ring of individual programmable LEDs.
- The diameter is smaller the first version.
- It can drive three motors. (When you use the LED then only two motors can be driven.)
Here are some impressions of the board:
As you can see I had to wire the LED by hand. The reason for this is that I used GPIO16 which does not work at all. So I wired the LED to GPIO0 which can be used for testing only. The only free GPIOs are 12, 13 and 14.