2 layers40 × 40 mm
2 layers69.9 × 29 mm
Tachometer dongle
anscg/tachometer-dongleA USB-A dongle that lights up like a tachometer.
- Size
- 69.9 × 29 mm
- Copper layers
- 2
- Thickness
- 2 mm
- Parts
- 29
- Nets
- 32
- Pads
- 97
- Tracks, vias
- 194, 27
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 Aug 2026
- Updated
- 28 Aug 2026
Overview
Tachometer dongle is an open-source printed circuit board by anscg, from the anscg/tachometer-dongle repository on GitHub. It is a 2-layer board of 69.9 × 29 mm with 29 parts on 32 nets, routed with 194 tracks and 27 vias.
It is built around the CH552G and WS2812B. Its parts include 14 diodes, 7 capacitors, 4 resistors, 1 IC and 1 connector. It belongs with the 8051 (CH55x, STC, AT89) boards of this library.
Main components
2README
README.mdtachometer-dongle
A USB-A dongle that lights up like a tachometer.
meow
using
| MCU | CH552G (8051 core, native USB device) |
| LEDs | 12x WS2812B-Mini in an R25 arc, plus D13/D14 indicators |
| Input | SW1 tab button + a capacitive touch pedal on the left of the board |
| Connector | USB-A plug, direct board edge (no separate connector part) |
| Board | 70.0 x 29.0 mm, semicircle body with a 12 x 12 mm plug tab, 2-layer |
libraries
- symbol
CH552G:CH552G - footprint
Footprints:USB-A
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | WS2812B | LED_SMD:LED_WS2812B-Mini_PLCC4_3.5x3.5mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C3, C4, C5, C6 |
| 3 | 330 | Resistor_SMD:R_0603_1608Metric | R2, R3, R4 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D13, D14 |
| 1 | 100u | Capacitor_SMD:C_1210_3225Metric | C7 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | CH552G | Package_SO:JEITA_SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_TS-1088-xR020 | SW1 |
| 1 | TestPoint | TestPoint:TestPoint_Pad_4.0x4.0mm | TP1 |
| 1 | USB_A | Footprints:USB-A | J1 |
Questions
How big is the Tachometer dongle PCB?
It measures 69.9 × 29 mm and has 2 copper layers, 2 mm thick.
What parts does the Tachometer dongle use?
29 parts, built around the CH552G and WS2812B. 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 Tachometer dongle KiCad files?
From the anscg/tachometer-dongle repository on GitHub, at the commit this page was made from: the board is hardware/tachometer-dongle.kicad_pcb and its schematic hardware/tachometer-dongle.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tachometer dongle design in my own project?
Its repository states no licence, so its author keeps all rights: ask anscg before reusing the design.
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