2 layers344.4 × 130.8 mm
2 layers312.3 × 119 mm
Frost
ayaangrover/frost2A 75% mechanical keyboard
- Size
- 312.3 × 119 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 168
- Nets
- 105
- Pads
- 765
- Tracks, vias
- 1,147, 212
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 May 2025
- Updated
- 30 Jul 2025
Overview
Frost is an open-source printed circuit board by ayaangrover, from the ayaangrover/frost repository on GitHub. It is a 2-layer board of 312.3 × 119 mm with 168 parts on 105 nets, routed with 1,147 tracks and 212 vias.
Its parts include 81 diodes, 81 switches and 1 IC. It belongs with the nRF52 and nRF5x boards of this library.
README
README.mdFrost
An OSHWA-certified 75% bluetooth hotswappable mechanical keyboard with over 3 months of battery.
About:
Frost uses a nice!nano v2, and a 110mah battery that will last up to 5 months. The nice!nano gives it bluetooth, and my configuration gets all the parts for under $150(other than the case). Also uses Cherry clip-in stabilizers and kailh hotswap sockets and M2(4mm) heatset inserts and screws to fasten the pcb to the case. Frost is OSHWA certified with UID US002745.
BOM:
| Item | Cost |
|---|---|
| MCU (nice!nano v2) | $25.00 |
| Battery (110mAh) | $3.00 |
| Switches | $19.30 |
| PCB | $58.23 |
| Stabilizers | $9.50 |
| Hotswap Sockets | $0.99 |
| Fasteners | $3.66 |
| Diodes | $1.99 |
| Keycaps | $16.99 |
| Foam | $9.99 |
| Total | $148.65 |
Links:
- MCU: https://bit.ly/43MxEzh (Free shipping, $25+)
- Battery: https://bit.ly/4mHn5pD (Free shipping with mcu)
- Switches: https://bit.ly/4dSzwen - MMD Princess Tactile 48g x90, under $20
- Stabilizers: https://bit.ly/3FuRC9E - KBD Fans, Cherry Clip in PCB Mount, pre lubed
- Hotswap Sockets: https://bit.ly/4dIZlgY
- Fasteners(3.2mm diameter on the heatset inserts, m2 heatsets and screws): https://bit.ly/43L1Xq4 and https://bit.ly/3Zae3aP
- Diodes: random aliexpress brand, doesnt matter which one since they're all very cheap
- Keycaps: Any
- Foam: https://www.amazon.com/HONKID-Keyboard-Foam-Mechanical-3mm/dp/B0CPPNF7NR?sr=8-4
Case:
Made with Fusion 360. Available at /case. Also includes the plate.
Firmware:
The firmware was made with ZMK, since the MCU for the keyboard(a nice!nano v2) was built specifically for use with ZMK. ZMK has inbuilt bluetooth support as well as support for displaying the batery capacity on the paired device. Firmware is at /firmware.
Renders:
Licensing:
Parts
168| Qty | Value | Footprint | References |
|---|---|---|---|
| 81 | Diode | ScottoKeebs_Components:Diode_DO-35 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +65 |
| 70 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_1.00u | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +54 |
| 3 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_1.25u | S72, S73, S74 |
| 2 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_2.25u | S56, S58 |
| 2 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_1.75u | S44, S69 |
| 2 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_1.50u | S30, S43 |
| 1 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_6.25u | S75 |
| 1 | Keyswitch | ScottoKeebs_Hotswap:Hotswap_MX_2.00u | S29 |
| 1 | LOGO | LOGO | G*** |
| 1 | LOGO | assets:Logo | G*** |
| 1 | Nice_Nano_V2 | ScottoKeebs_MCU:Nice_Nano_V2 | U1 |
The 165 most common of 168 parts.
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Questions
How big is the Frost PCB?
It measures 312.3 × 119 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Frost use?
168 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 Frost KiCad files?
From the ayaangrover/frost repository on GitHub, at the commit this page was made from: the board is frost/frost.kicad_pcb and its schematic frost/frost.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Frost design in my own project?
Its repository states no licence, so its author keeps all rights: ask ayaangrover before reusing the design.