inmbolmie/elfacun4Hardware project to create a chess module compatible with the old Mephisto modular boards (Exclusive, Modular, München) that will provide connectivity to a wide variety of chess apps and services
Elfacun v2 is an open-source printed circuit board by inmbolmie, from the inmbolmie/elfacun repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 177 × 79 mm with 66 parts on 193 nets, routed with 2,077 tracks and 116 vias.
It is built around the 74HC245D, ISH0503A and 74HC373D, with the 74HC257D, 74HC74D and 74HCT00D among its other parts. Its parts include 18 ICs, 16 resistors, 7 connectors, 7 switches and 6 capacitors. It belongs with the ESP32 boards of this library.
(2026/02/07): Elfacun software version R17 released with new Chessconnect mode : Link: ----- R17 files ----- Installation instructions: ----- Update Elfacun
This is an ongoing hardware project to create a chess module compatible with the old Mephisto modular boards (Exclusive, Modular, München) that will provide connectivity to a wide variety of chess apps and services.
The project currently comprises three devices:
The hardware as well as software developed for it are published here under the GPL license.
To assist in the release of the module, I provide here links to some basic documentation:
(2025/06/15): Source code and design files for V2 module released: ----- Make your own module
(2025/02/23): Elfacun software version R15 released with chess 960 support: Link: ----- R15 files ----- Installation instructions: ----- Update Elfacun
(2025/02/23): Diablillo software version R15 released with bug fixes: Link: ----- R15 files ----- Installation instructions: ----- Update Diabillo
(2024/05/26): Elfacun software version R14 released with bug fixes: Link: ----- R14 files ----- Installation instructions: ----- Update Elfacun
(2024/01/19): Elfacun software version R12 released with improvements for Lichess mode: Link: ----- R12 files ----- Installation instructions: ----- Update Elfacun
(2023/09/16): Elfacun software version R11 released with new Chessnut-compatible mode: Link: ----- R11 files ----- Installation instructions: ----- Update Elfacun
(2023/07/13): Elfacun software version R10 released with bug fixes: Link: ----- R10 files ----- Installation instructions: ----- Update Elfacun
(2023/06/12): Elfacun software version R9 released with bug fixes: Link: ----- R9 files ----- Installation instructions: ----- Update Elfacun
(2023/06/07): Elfacun software version R8 released with support for the new Diablillo device: Link: ----- R8 files ----- Installation instructions: ----- Update Elfacun
(2023/03/05): Elfacun software version R7 released with on-screen LED indications in passive mode, board position storage and customizable sound and BLE power level: Link: ----- R7 files ----- Installation instructions: ----- Update Elfacun
(2023/02/08): Elfacun software version R6 released with opponent ELO range on Lichess challenges: Link: ----- R6 files ----- Installation instructions: ----- Update Elfacun
(2023/01/30): Elfacun software version R5 released with some bug fixes: Link: ----- R5 files ----- Installation instructions: ----- Update Elfacun
(2023/01/28): Elfacun hardware version 2 released with new features and improved compatibility with original modules: Links: ----- V2 features ----- V2 manual ----- V2 compatibility
(2023/01/28): Brocoli battery power module for Elfacun: Link: ----- Brocoli power module
(2022/05/04): Elfacun software version R4 released with some bug fixes: R4 files Installation instructions: ----- Update Elfacun
(2022/09/03): Source code and design files released: ----- Make your own module
"DGT", "Millennium", "Mephisto", "Chessnut" and "IChessOne" are trademarks of their respective owners. All the trademarks are used nominatively to indicate compatibility, and do not indicate affiliation to or endorsement by the trademark owners.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1K | Resistor_SMD:R_0603_1608Metric | R4, R5, R7, R8, R9, R10, R11, R12 |
| 6 | SW_Push | audio:honyone_pb13_switch | SW1, SW2, SW3, SW4, SW5, SW6 |
| 5 | 100K | Resistor_SMD:R_0603_1608Metric | R6, R13, R14, R15, R16 |
| 5 | SS34 | Diode_SMD:D_SMA | D1, D2, D5, D6, D7 |
| 4 | 100uF | Capacitor_SMD:C_1206_3216Metric | C1, C3, C4, C6 |
| 3 | MC14066BDG | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U8, U9, U10 |
| 2 | 1,5K | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C2, C5 |
| 2 | 74F189 | Package_DIP:DIP-16_W7.62mm | U17, U18 |
| 2 | 74HC245 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U2, U14 |
| 2 | 74HC373 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U11, U19 |
| 2 | MCP23S17_SS | Package_DIP:DIP-28_W7.62mm | U3, U4 |
| 2 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2 |
| 1 | 150 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 2N3904 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | 3.3V | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Horizontal | J6 |
| 1 | 5K | potent:RES-ADJ-SMD_G32AT | RV1 |
| 1 | 74HC257 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | 74HC74 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U12 |
| 1 | 74HCT00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U13 |
| 1 | 74LS148 | Package_SO:SOP-16_3.9x9.9mm_P1.27mm | U16 |
| 1 | AudioJack3 | audio:AUDIO-TH_PJ-3059-X | J1 |
| 1 | Buzzer | Buzzer_Beeper:MagneticBuzzer_ProSignal_ABT-410-RC | BZ1 |
| 1 | CR2013-MI2120 | Display:CR2013-MI2120 | U6 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J5 |
| 1 | Conn_02x20_Odd_Even | con_5_08:PinHeader_2x20_P2.54mm_Horizontal | J2 |
| 1 | ESP32-DEVKITC-32D | esp32:MODULE_ESP32-DEVKITC-32D | U5 |
| 1 | ISH0503A | xp:ISE0303A | PS1 |
| 1 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | LED control source | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | RFID-RC522-MODULE | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | P1 |
| 1 | SW_DPDT_x2 | dpdt_2:SW-TH_K3-2235S-K1 | SW7 |
| 1 | TXS0108EPW | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | USB_B_Mini | Connector_USB:USB_Mini-B_Tensility_54-00023_Vertical | J3 |
inmbolmie/elfacun
Hardware project to create a chess module compatible with the old Mephisto modular boards (Exclusive, Modular, München) that will provide connectivity to a wide variety of chess apps and services
SmallRobot2000/AMIX-68k
Motorola 68010 based sbc with IDE, keyboard, DMA, PIT, Xosera & more!
snippyrow/-816-board
A retro computer motherboard for the W65C816S CPU. Dual-core expandable, 16mb extended memory, four expansion ports.
It measures 177 × 79 mm and has 2 copper layers, 1.6 mm thick.
66 parts, built around the 74HC245D, ISH0503A, 74HC373D and 74HC257D. 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 inmbolmie/elfacun repository on GitHub, at the commit this page was made from: the board is Kicad/v2.1/elfacun_v2.kicad_pcb and its schematic Kicad/v1.1/elfacun_11.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).