2 layers254 × 254.1 mm
Assembly
K-0hm/Chessboard
Code for a chessboard with light and capacitance Touch Sensors.
236 partsGPL-3.0
2 layers396.3 × 336.1 mm
Chessconnect
K-0hm/ChessboardCode for a chessboard with light and capacitance Touch Sensors.
- Size
- 396.3 × 336.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 260
- Nets
- 199
- Pads
- 766
- Tracks, vias
- 1,394, 240
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Apr 2026
- Updated
- 24 May 2026
Overview
Chessconnect is an open-source printed circuit board by K-0hm, from the K-0hm/Chessboard repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 396.3 × 336.1 mm with 260 parts on 199 nets, routed with 1,394 tracks and 240 vias.
It is built around the ATMEGA328P-PU, SN74LVC125ADRG3 and MPR121QR2, with the LM1117DT-3.3 and WS2812B among its other parts. Its parts include 85 capacitors, 65 diodes, 32 resistors, 10 ICs and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
SN74LVC125ADRG3
SOIC-14-40℃~+125℃ 1 1.65V~3.6V 2.5ns@3.3V,50pF 24mA 24mA 4 40uA 74LVC Output enable、Level shifting Tri-State Unidirectional SOIC-14 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
MPR121QR2
QFN-20(3x3)-40℃~+85℃ 1.71V~3.6V 12 29uA 2kV 3uA Capacitive Touch QFN-20(3x3) Touch Sensors ROHSNXP SemiconductorsTouch Sensors
LM1117DT-3.3
TO-2520℃~+125℃@(Tj) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
README
README.mdTactBoard
Code for a chessboard with light and capacitance Touch Sensors.
Parts
260| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | 100p | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +48 |
| 64 | TestPoint | TestPoint:TestPoint_Pad_4.0x4.0mm | T1, T2, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23 +48 |
| 64 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +48 |
| 13 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C67, C69, C71, C72, C73, C74, C75, C76, C77, C78, C79, C80, C85 |
| 12 | 4,7kΩ | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R4, R12, R13, R16, R17, R20, R21, R24, R25, R28, R29 |
| 9 | 4,7k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R6, R7, R8, R9, R11, R15, R19, R23, R27 |
| 6 | 75kΩ | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R14, R18, R22, R26, R30 |
| 6 | MPR121QR2 | Package_DFN_QFN:UQFN-20_3x3mm_P0.4mm | U1, U3, U5, U6, U7, U8 |
| 3 | 0.1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C68, C81, C82 |
| 3 | 330 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R32, R33, R34 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C65, C66 |
| 1 | 100uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C84 |
| 1 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C83 |
| 1 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R31 |
| 1 | 4.7u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C70 |
| 1 | ATmega328P-P | Package_DIP:DIP-28_W7.62mm | U4 |
| 1 | AVR-ISP-6 | Connector_PinSocket_2.54mm:PinSocket_2x03_P2.54mm_Vertical | J3 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | LM1117DT-3.3 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U9 |
| 1 | LedAlim | LED_SMD:LED_0201_0603Metric_Pad0.64x0.40mm_HandSolder | D65 |
| 1 | SN74LVC125ADR | Myfootprints:SOIC74LVC125 | IC1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H8mm | SW8 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-3-2-5.08_1x02_P5.08mm_Horizontal | J1 |
| 1 | TCA9548APWR | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U2 |
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Questions
How big is the Chessconnect PCB?
It measures 396.3 × 336.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chessconnect use?
260 parts, built around the ATMEGA328P-PU, SN74LVC125ADRG3, MPR121QR2 and LM1117DT-3.3. 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 Chessconnect KiCad files?
From the K-0hm/Chessboard repository on GitHub, at the commit this page was made from: the board is Kicad_v_plein/chessconnect.kicad_pcb and its schematic Kicad_v_plein/Leds.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chessconnect design in my own project?
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).