Corteil/EMF_space_unicorn1code and PCB design files for my Space Unicorn hextension for EMF 2026
Hexpansion is an open-source printed circuit board by Corteil, from the Corteil/EMF_space_unicorn repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 48.8 × 49.9 mm with 50 parts on 27 nets, routed with 184 tracks and 73 vias.
It is built around the ATTINY85-20SU, M24C16-RMN6TP and OSTVN02A150, with the OSTVN04A150 among its other parts. Its parts include 9 resistors, 5 connectors, 4 capacitors, 2 ICs and 2 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
KiCad design files for the EMF26 Space Unicorn hexpansion.
| Front | Rear |
|---|---|
 |  |
| Path | What |
|---|---|
hexpansion.kicad_pro / .kicad_sch / .kicad_pcb | KiCad project, schematic and board. |
fp-lib-table, sym-lib-table | Library tables. |
*.pretty/ | Project-local footprint libraries (unicorn, heart, gfx, NextPCB). |
gerbers/ | Gerbers + drill files for fabrication. |
renders/ | Board renders and the paper template. |
LICENSE.txt | Hardware licence. |
0x40), an M24256E
EEPROM (hexpansion identity + resident app), and a BC857BS for Ext_5V
reverse-feed protection.fp-lib-table references some footprints by absolute local paths (parts from
…/Hardware/parts/…) and a sibling tildagon-base. These won't resolve on a
fresh clone, but KiCad caches footprints in the .kicad_pcb, so the board
opens, views and plots correctly. Re-point those library entries if you need to
edit footprints.| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10K | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R8, R9, R10 |
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C3, C4 |
| 3 | 300Ω | Resistor_SMD:R_0603_1608Metric | R1, R6, R7 |
| 2 | FSM2JRT | 6x6mm switch:FSM2JRT | S1, S2 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D1, D2 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad_Via | H1, H2 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | ATTINY85-20SU | ATTINY85:8S2_ATM | U1 |
| 1 | BC857BS-13-F | BC857BS:SOT65P210X100-6N | U2 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | Heart | heart:heart | |
| 1 | Hexpansion-Connector | tildagon:hexpansion-edge-connector | J1 |
| 1 | Jumper_2_Small_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP1 |
| 1 | M24C16-RMN6TP | M24C16-RMN6TP:SO-8_STM | CR1 |
| 1 | OSTVN02A150 | 2 block:CONN_OSTVN02A150_OST | J3 |
| 1 | OSTVN04A150 | 4 block:CONN_OSTVN04A150_OST | J4 |
| 1 | Q_PMOS_DGS | Package_TO_SOT_SMD:SOT-23 | Q1 |
The 30 most common of 50 parts.
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It measures 48.8 × 49.9 mm and has 2 copper layers, 1 mm thick.
50 parts, built around the ATTINY85-20SU, M24C16-RMN6TP, OSTVN02A150 and OSTVN04A150. 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.
From the Corteil/EMF_space_unicorn repository on GitHub, at the commit this page was made from: the board is hardware/hexpansion.kicad_pcb and its schematic hardware/hexpansion.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).