2 layers
Openchess controller
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.
67 parts1
2 layers37 × 57.8 mm
Circular pcb,Mark2
sarankrishna1098/PCB-designinghydroscale
- Size
- 37 × 57.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 33
- Pads
- 104
- Tracks, vias
- 224, 18
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 May 2026
- Updated
- 18 May 2026
Overview
Circular pcb,Mark2 is an open-source printed circuit board by sarankrishna1098, from the sarankrishna1098/PCB-designing repository on GitHub. It is a 2-layer board of 37 × 57.8 mm with 27 parts on 33 nets, routed with 224 tracks and 18 vias.
It is built around the CH340C, RA-08H and AMS1117, with the B2B-XH-A among its other parts. Its parts include 7 connectors, 6 capacitors, 5 resistors, 3 ICs and 2 diodes.
Main components
4
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB ConvertersRA-08H
SMD-18P-138dBm -40℃~+85℃ 115mA 2.7V~3.6V 22dBm 433MHz、470MHz、490MHz 9.5mA FSK、LoRa、GFSK、MSK、GMSK、BPSK SPI、UART、ADC、GPIO、I2C、I2S、PWM、DAC Stamp Hole Antenna、IPEX interface SMD-18P LoRa Modules ROHSAi-ThinkerLoRa Modules
AMS1117
1.0 A Low-Dropout Fixed RegulatorAdvanced Monolithic SystemsUncategorised
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
README
README.mdPCB-designing
hydroscale
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1UF | Capacitor_SMD:C_0805_2012Metric | C2, C4, C6 |
| 3 | 10UF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5 |
| 3 | 4.7K | Resistor_SMD:R_1206_3216Metric | R1, R2, R3 |
| 3 | B2B-XH-A | 2connector:JST_B2B-XH-A | J4, J5, J7 |
| 2 | 1N5819 | Diode_SMD:D_1206_3216Metric | D1, D2 |
| 2 | 22R | Resistor_SMD:R_1206_3216Metric | R4, R5 |
| 2 | MountingHole | MountingHole:MountingHole_2.1mm | H3, H4 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_CK_PTS125Sx43PSMTR | SW1, SW2 |
| 1 | AMS1117 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Vertical | J3 |
| 1 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J6 |
| 1 | RA-08H | footprints:MOD18_RA-08H_AIT-L | U1 |
| 1 | SMA-J-P-X-RA-TH1 | sma model:ANTENNA_SMA-J-P-X-RA-TH1 | J2 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10104110_Horizontal | J1 |
Questions
How big is the Circular pcb,Mark2 PCB?
It measures 37 × 57.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Circular pcb,Mark2 use?
27 parts, built around the CH340C, RA-08H, AMS1117 and B2B-XH-A. 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 Circular pcb,Mark2 KiCad files?
From the sarankrishna1098/PCB-designing repository on GitHub, at the commit this page was made from: the board is circular_pcb,Mark2.kicad_pcb and its schematic circular_pcb.Mark2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Circular pcb,Mark2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask sarankrishna1098 before reusing the design.
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