A long time ago I built the BLE LED Pocket Square. A fancy gadget to show off at student parties. Wearing a typical student-blazer was common practice those days.
With some weddings coming up I decided to re-iterate the original concept and make a version 2. There were a few disadvantages of the original one; the pcb was bulky, the 9v battery was heavy and controlling the device required interaction with a smartphone - which I find not socially acceptable these days.
Improvements on version 2:
- controllable with my BangleJS 2 watch - so it should work with Bluetooth Low Energy
- custom PCB
- m5stack stamp s3 controller (esp32)
- lipo-battery
The pcb is fairly easy: a socket for the m5stack stamp s3, 7 ws2813b 'neopixel's and a battery connector.
Note: nothing is perfect: the image of the pcb contains wrong wiring for the BOUT pins of the ws2813b's (the image of the schema is correct). I ended up manually breaking the leg of that pin for every single ws2813b to get the thing working.
See the result in action: