2 layers159.5 × 30 mm
Type f
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
25 parts3kApache-2.0
2 layers132.4 × 26.2 mm
MinimalSmallInputModule
cscott/DummyTouchpadFW163This is a dummy touchpad. All it does is contain the resistors and pads to tell the FW16 that there is a touchpad installed (though there is not).
- Size
- 132.4 × 26.2 mm
- Copper layers
- 2
- Thickness
- 0.96 mm
- Parts
- 25
- Nets
- 10
- Pads
- 50
- Tracks, vias
- 134, 28
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 7 Jul 2024
- Updated
- 25 Jul 2024
Overview
MinimalSmallInputModule is an open-source printed circuit board by cscott, from the cscott/DummyTouchpadFW16 repository on GitHub. It is a 2-layer board of 132.4 × 26.2 mm with 25 parts on 10 nets, routed with 134 tracks and 28 vias.
Its parts include 6 diodes, 3 resistors, 2 capacitors and 2 connectors.
README
README.mdDummy Touchpad Input Module
This is a dummy touchpad. All it does is contain the resistors and pads to tell the FW16 that there is a touchpad installed (though there is not). It also brings the signal lines out to a 2.54mm SMT header, but that's mostly for debugging/development, not for any real use.
If you are using this in conjunction with a full width touchpad spacer don't populate the header.
Here's the schematic.
License
Input Modules © 2023 by Framework Computer Inc is licensed under CC BY 4.0. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Fabrication and Assembly
Use a 0.8mm PCB for Input Modules.
As with the Framework example use Keystone 24929 "zero height threaded inserts" (available from Digikey) where indicated, with the "big" side down. These are soldered in place and provide enough steel to engage properly with the magnets on the FW16 midplate to hold the PCB in place.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 24929 | InputModule:MountingHole_3.7mm_Pad_24929 | H1, H2, H5, H6, H9, H10 |
| 6 | D_TVS | Diode_SMD:D_0402_1005Metric | D1, D2, D3, D4, D5, D6 |
| 6 | MountingHole | MountingHole:MountingHole_2.1mm | H3, H4, H7, H8, H11, H12 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 330k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | Debug Header | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical_SMD | J2 |
| 1 | Pogo Pins | InputModule:PogoPads_2x4_P2.0mm | J1 |
Questions
How big is the MinimalSmallInputModule PCB?
It measures 132.4 × 26.2 mm and has 2 copper layers, 0.96 mm thick.
What parts does the MinimalSmallInputModule use?
25 parts. 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 MinimalSmallInputModule KiCad files?
From the cscott/DummyTouchpadFW16 repository on GitHub, at the commit this page was made from: the board is MinimalSmallInputModule.kicad_pcb and its schematic MinimalSmallInputModule.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MinimalSmallInputModule design in my own project?
Its repository states no licence, so its author keeps all rights: ask cscott before reusing the design.
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