This project can be used to make tiny RGB wearables.
Origin of this project was for a set of RGB earring for my close one :
What I wanted :
A set of two roller-skate earrings with RGB leds lighting the rollers
If possible, I want the led blink pattern to be programmable and selectable by touching the earring
But I don't know if I want the earring to synchronize with each others
And maybe a mic to react to ambiant sound !
Thanks to Mitxela for the inspiration !
Check out his projects :
- Microphone for sound reaction
- Embedded WS2812B RGB LED
- Small push-button
- 5V boost converter with 'Enable' control
- 2.3V to 5.5V power input
- Only 8.5mm in diameter
| Bottom face | Top face |
|---|---|
 |
 |
- Use the same earring base : https://www.amazon.fr/dp/B0FLQ4GSNZ
- This serves as 2x SR/LR521 button cells holder /!\ It's better to use SR battery as they have higher energy density and flatter discharge curve
- Add a small step-up DC/DC to use the battery full range, with output voltage enough for LEDs
- 5v out integrated boost dc/dc : https://pim.murata.com/en-eu/pim/details/?productCategoryId=nonIsolatedDCDCconverter&partNum=MYRBP500080W21RD
- Add a small LDO to generate a stable 1.8V for MCU and stuff
- Add a small µC to generate the LED signals and HMI stuff like these
- No BLE (choosed one for simplicity)
- BLE WLCSP
- STM32WBA55HGF6TR
- IPD : MLPF-WB-05D3
- Add a small mic : https://www.lcsc.com/product-detail/C47148419.html
- And the tiniest RGB leds I can find (1x1mm): https://www.lcsc.com/product-detail/C51900942.html
Copyright (C) Nathan GARNIER Licensed under CERN-OHL-S v2, see CERN-OHL-S License user-guide.