#869 UART-TTL to LED Array Interface Board
Building a simple interface board for connecting a CH340-based UART-TTL adapter to an WS2811 or WS2812B LED strip.
Notes
In LEAP#868 LED Array Control from macOS I played with controlling a string of WS2811 or WS2812B LEDs from macOS through a CH340-based UART-TTL adapter.
In these notes, I throw the connecting circuitry on a small protoboard for convenience.
Circuit Design
A simple board featuring:
- 5V power supply connector
- power decoupling capacitor
- TTL (active-low) to WS28xx (active-high) logic inverter
Designed with Fritzing: see Adapter.fzz.
Construction
A simple layout on a small piece of protoboard:
Final Test
Sending a GRB sequence to the first 6 LEDs in a WS2812B strip:
$ echo "00FF0000 00FF00 0000FF FF0000 00FF00 0000FF" | ../ws2812bify.py -p /dev/cu.usbserial-2420
Sending data to /dev/cu.usbserial-2420 at 2500000 baud...
