Tiny LED ring with a microphone for wearable music-reactive lighting
Cc ring is an open-source printed circuit board by JackToaster, from the JackToaster/Wearable-LED-Ring repository on GitHub. It is a 2-layer board of 75 × 5.5 mm with 42 parts on 61 nets, routed with 253 tracks and 71 vias.
It is built around the CSD83325L, WS2812B-2020 and SPH0641LU4H-1. Its parts include 15 capacitors, 15 diodes, 4 ICs, 4 connectors and 2 resistors. It belongs with the STM32 boards of this library.
This project is intended to be a wearable ring with integrated batteries, LEDs, microphone, and microcontroller.
Tiny flex PCB to fit in a ring form factor with a curved battery.
The ring uses an STM32L431CCYxxx microcontroller with a PCM microphone. The software is a port of ColorChord Embedded, originally developed by CNLohr.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15 |
| 14 | WS2812B-2020 | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D11, D12, D13, D14, D15, D16 |
| 2 | Battery | SolderPads:Battery | J1, J3 |
| 1 | 0402 | LED_SMD:LED_0402_1005Metric | D9 |
| 1 | 120 | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | BQ297xy | Package_SON:WSON-6_1.5x1.5mm_P0.5mm | U2 |
| 1 | CSD83325L | CSD83325L:YJE0006A | U3 |
| 1 | Charge | SolderPads:MageneticChargeConnector | J4 |
| 1 | Debug | SolderPads:BGA-4_2x2_3.0x3.0mm | J2 |
| 1 | LOGO | pretzel:pretzel | G*** |
| 1 | SPH0641LU4H-1 | Sensor_Audio:Knowles_LGA-5_3.5x2.65mm | MK1 |
| 1 | STM32L431CCYx | Package_CSP:ST_WLCSP-49_Die435 | U1 |
| 1 | TLV70736DQNR | tlv707:DQN0004A | U4 |
It measures 75 × 5.5 mm and has 2 copper layers, 0.12 mm thick.
42 parts, built around the CSD83325L, WS2812B-2020 and SPH0641LU4H-1. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the JackToaster/Wearable-LED-Ring repository on GitHub, at the commit this page was made from: the board is cc-ring.kicad_pcb and its schematic cc-ring.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask JackToaster before reusing the design.
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