2 layers34.8 × 59.7 mm
2 layers22 × 31 mm
Underglow slave
lukmatuska/UnderglowCheap wireless lighting system for small local applications (cars, bikes, etc...)
- Size
- 22 × 31 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 12
- Pads
- 64
- Tracks, vias
- 0, 0
- Pours
- 3
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Sep 2026
- Updated
- 26 Oct 2026
Overview
Underglow slave is an open-source printed circuit board by lukmatuska, from the lukmatuska/Underglow repository on GitHub. It is a 2-layer board of 22 × 31 mm with 15 parts on 12 nets.
It is built around the CH572Q and HT7550-1. Its parts include 7 capacitors, 2 ICs, 1 connector and 1 crystal.
Main components
2
CH572Q
DFN-10-EP(3x3)DFN-10-EP(3x3) Microcontrollers (MCU/MPU/SOC) ROHSWCH (Nanjing Qinheng Microelectronics)Microcontrollers (MCU/MPU/SOC)
HT7550-1
SOT-89-3-40℃~+85℃@(Ta) 1 150mA 2.5uA 25mV@(1mA) 30V 5V Fixed Positive SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHOLTEKVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | DNP | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3 |
| 1 | +12V in | TestPoint:TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | TP1 |
| 1 | 100n | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 1u | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 1u 25V | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 32MHz 8pF | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | Antenna | RF_Antenna:Texas_SWRA117D_2.4GHz_Right | AE1 |
| 1 | CH572Q | Package_DFN_QFN:DFN-10-1EP_2.6x2.6mm_P0.5mm_EP1.3x2.2mm | U1 |
| 1 | Debug_header | Connector_PinHeader_1.27mm:PinHeader_1x04_P1.27mm_Vertical | J1 |
| 1 | GND screw | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1 |
| 1 | HT7550-1 | Package_TO_SOT_SMD:SOT-89-3 | U2 |
| 1 | ~ | Mylib:Addressable_led_adapter_10mm | ADDR_LED1 |
Questions
How big is the Underglow slave PCB?
It measures 22 × 31 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Underglow slave use?
15 parts, built around the CH572Q and HT7550-1. 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.
Where can I download the Underglow slave KiCad files?
From the lukmatuska/Underglow repository on GitHub, at the commit this page was made from: the board is HW/Underglow-slave/Underglow-slave.kicad_pcb and its schematic HW/Underglow-slave/Underglow-slave.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Underglow slave design in my own project?
Its repository states no licence, so its author keeps all rights: ask lukmatuska before reusing the design.
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