2 layers282 × 282 mm
Openchess board
PaoloJN/openchess
A chessboard that knows where the pieces are: 64 Hall sensors, 81 RGB LEDs, one ESP32, a printed case, and a BLE phone app. KiCad hardware, PlatformIO firmware, Expo app.
251 parts1
2 layers
Openchess controller
PaoloJN/openchess1A chessboard that knows where the pieces are: 64 Hall sensors, 81 RGB LEDs, one ESP32, a printed case, and a BLE phone app. KiCad hardware, PlatformIO firmware, Expo app.
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 76
- Pads
- 333
- Tracks, vias
- 138, 12
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 3 Jun 2026
- Updated
- 24 Oct 2026
Overview
Openchess controller is an open-source printed circuit board by PaoloJN, from the PaoloJN/openchess repository on GitHub. It is a 2-layer board with 67 parts on 76 nets, routed with 138 tracks and 12 vias.
It is built around the 74AHCT125D, CH340C and TPS61022RWUR, with the AMS1117-3.3, BQ24074RGTR and TBD62783APG among its other parts. Its parts include 26 resistors, 18 capacitors, 8 ICs, 7 connectors and 2 diodes. It belongs with the ESP32 boards of this library.
Main components
10
74AHCT125D
SOP-14-40℃~+125℃ 1 4 4.3ns@5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
TPS61022RWUR
VQFN-7(2x2)-40℃~+125℃@(TJ) 1 2.2V~5.5V 3A 3uA 500mV~5.5V 600kHz、1MHz Adjustable Boost Boost Built-in Overcurrent Protection、Light load efficient mode、Load disconnect Yes VQFN-7(2x2) DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BQ24074RGTR
QFN-16-EP(3x3)-40℃~+125℃ 1 1.5A 4.2V 4.35V~10.2V 6.5uA Charging IC Lithium Battery Not supported Support QFN-16-EP(3x3) Battery Management ROHSTexas InstrumentsBattery Management
TBD62783APG
DIP-18-40℃~+85℃ 0.1mA 1uA 1uA 2V 30V 8 DIP-18 Darlington Transistor Arrays ROHSToshibaPower Distribution Switches
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
B2B-XH-A
插件,P=2.5mm-25℃~+85℃ 1 1x2P 2 2.5mm 250V 2P 3A 5.75mm 7.4mm 7mm Brass K Pin PA66 Through Hole Tin UL94V-0 White XH 插件,P=2.5mm Wire To Board Connector ROHSJSTWire To Board Connector
MSK12C02
SMD,8x2.8mm-20℃~+70℃ 1.4mm 10000 times 12V 2.8mm 50mA 8mm SMD(SMT) Tab SPDT Surface Mount, Right Angle SMD,8x2.8mm Slide Switches ROHSSHOU HANSlide Switches
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
hardware/hardware-controller-v2/README.mdhardware-controller-v2 (shelved)
Status: shelved 2026-10-24, never fabricated. The schematic reached ERC-clean and layout was started. Dropped because the v0.1 controller with a battery-module swap does the job for a one-off board. Kept for reference.
Integrated controller: soldered ESP32-WROOM-32E + USB-C (CH340C) + BQ24074 power-path charger + TPS61022 5V boost + AMS1117-3.3. Replaces the v1 DevKitC + Lipo Rider Plus daughterboards.
- Spec:
docs/superpowers/specs/2026-07-27-controller-v2-integrated-design.md - Plan:
docs/superpowers/plans/2026-07-27-controller-v2-integrated.md - GPIO map:
docs/gpio-map.md(v2 table) - Part sourcing + design values:
SOURCING.md
The KiCad files keep their original names (openchess-controller.*) within this
directory; the directory name itself (hardware-controller-v2/) distinguishes v2
from frozen v1.
v1 (../hardware-controller/) is frozen — boards exist physically.
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | 10µF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C14, C17, C18, C20, C21, C22 |
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R20, R23, R24, R30, R36, R37 |
| 5 | 100nF | Capacitor_SMD:C_0603_1608Metric | C11, C12, C13, C16, C19 |
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R15, R26, R32 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R25, R27 |
| 2 | 22µF | Capacitor_SMD:C_0805_2012Metric | C24, C25 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R21, R22 |
| 2 | D | LED_SMD:LED_0603_1608Metric | D4, D5 |
| 2 | S8050 J3Y | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW_BOOT1, SW_EN1 |
| 1 | 1.1K | Resistor_SMD:R_0603_1608Metric | R28 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 100µF | Capacitor_SMD:CP_Elec_6.3x5.4 | C23 |
| 1 | 1µF | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 1µH | Inductor_SMD:L_APV_APH0420 | L1 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 33Ω | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 74AHCT125 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | 750k | Resistor_SMD:R_0603_1608Metric | R31 |
| 1 | 910Ω | Resistor_SMD:R_0603_1608Metric | R29 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U11 |
| 1 | B2B-XH-A | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J5 |
| 1 | BQ24074RGTR | Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm_ThermalVias | U9 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | Conn_02x13 | Connector_PinHeader_2.54mm:PinHeader_2x13_P2.54mm_Vertical | J1 |
| 1 | ESP32-WROOM-E | RF_Module:ESP32-WROOM-32E | U2 |
| 1 | J_BTN_DOWN XH-2 | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J8 |
| 1 | J_BTN_OK XH-2 | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J9 |
| 1 | J_BTN_UP XH-2 | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J7 |
| 1 | J_OLED XH-4 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J6 |
| 1 | MSK12C02 | Button_Switch_SMD:SW_SPDT_Shouhan_MSK12C02 | SW1 |
| 1 | TBD62783A | Package_SO:SOP-18_7.495x11.515mm_P1.27mm | U6 |
| 1 | TPS61022RWUR | Package_DFN_QFN:Texas_RWU0007A_VQFN-7_2x2mm_P0.5mm | U10 |
| 1 | TYPE-C-31-M-12 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J4 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U8 |
Questions
What parts does the Openchess controller use?
67 parts, built around the 74AHCT125D, CH340C, TPS61022RWUR and AMS1117-3.3. 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 Openchess controller KiCad files?
From the PaoloJN/openchess repository on GitHub, at the commit this page was made from: the board is hardware/hardware-controller-v2/openchess-controller.kicad_pcb and its schematic hardware/hardware-board/openchess-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Openchess controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask PaoloJN before reusing the design.
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