2 layers27.6 × 30.5 mm
MotionRecognitionWatch
AidenBTTU/Gesture-Capture-Watch
A wristband-mounted gesture recognition system built around an STM32F411, IMU, and OLED display, with USB-C battery charging and ESD-protected I/O.
46 parts
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Li Charger
kbroomm/Single-Cell-Li-ion-ChargerKiCad PCB design for a single-cell lithium-ion battery charger, with a 5V USB-C input and 10-LED charge level indicator.
- Size
- 26 × 38 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 28
- Pads
- 105
- Tracks, vias
- 243, 6
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 Jun 2026
- Updated
- 13 Jun 2026
Overview
Li Charger is an open-source printed circuit board by kbroomm, from the kbroomm/Single-Cell-Li-ion-Charger repository on GitHub. It is a 2-layer board of 26 × 38 mm with 34 parts on 28 nets, routed with 243 tracks and 6 vias.
It is built around the LM3914V and BQ24092DGQR. Its parts include 12 resistors, 12 diodes, 3 capacitors, 2 ICs and 2 connectors. It belongs with the power boards of this library.
Main components
2README
README.mdLi Charger
KiCad PCB design for a single-cell lithium-ion battery charger, with a 5V USB-C input and 10-LED charge level indicator.
Features
- BQ24092 linear charger IC (Texas Instruments)
- LM3914 dot/bar display driver for charge indication
- USB-C power input
- JST battery connector
Project structure
├── hardware/ KiCad schematic, PCB, and custom libraries
│ ├── Li Charger.kicad_pro
│ ├── Li Charger.kicad_sch
│ ├── Li Charger.kicad_pcb
│ └── libs/ Custom symbol and footprint imports
├── manufacturing/
│ └── gerbers/ Fabrication outputs (Gerber + drill files)
├── datasheets/ Component reference PDFs
├── 3D models/ Component models not included in standard libsManufacturing
Gerber and drill files for PCB fabrication are in manufacturing/gerbers/.
Datasheets
| Part | Document |
|---|---|
| BQ24092 | docs/datasheets/bq24092.pdf |
| LM3914 | docs/datasheets/lm3914.pdf |
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | LED_Small | LED_SMD:LED_0805_2012Metric | D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 3 | R_Small | Resistor_SMD:R_0805_2012Metric | R1, R2, R3 |
| 3 | SolderWirePad_1x01_SMD_1x2mm | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | GND, VBAT, VBUS |
| 2 | 1.5k | Resistor_SMD:R_0805_2012Metric | R4, R5 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric | R9, R12 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R6, R7 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D1, D2 |
| 1 | 15k | Resistor_SMD:R_0805_2012Metric | R10 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R11 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric | R8 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | BQ24092DGQR | Package_SO:HVSSOP-10-1EP_3x3mm_P0.5mm_EP1.83x1.89mm | U1 |
| 1 | Conn_01x02 | Connector_JST:JST_JWPF_B02B-JWPF-SK-R_1x02_P2.00mm_Vertical | J2 |
| 1 | LM3914V | Package_LCC:PLCC-20 | U2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_GCT_USB4125-xx-x-0190_6P_TopMnt_Horizontal | J1 |
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Questions
How big is the Li Charger PCB?
It measures 26 × 38 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Li Charger use?
34 parts, built around the LM3914V and BQ24092DGQR. 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 Li Charger KiCad files?
From the kbroomm/Single-Cell-Li-ion-Charger repository on GitHub, at the commit this page was made from: the board is hardware/Li Charger.kicad_pcb and its schematic hardware/Li Charger.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Li Charger design in my own project?
Its repository states no licence, so its author keeps all rights: ask kbroomm before reusing the design.