2 layers150.5 × 48 mm
Battery bus
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
136 parts915
2 layers99.6 × 99.1 mm
PCB v0.3
iloevera/hku-martians-prototype115A 10x10cm 2-layer Robot Controller & PDB for Pi 5 & Pico 2. 22.2V input, 12V/7.5V/5.1V rails, 6 DC motors, 6 encoders, 4 servos.
- Size
- 99.6 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 61
- Nets
- 78
- Pads
- 300
- Tracks, vias
- 345, 118
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Apr 2026
- Updated
- 13 May 2026
Overview
PCB v0.3 is an open-source printed circuit board by iloevera, from the iloevera/hku-martians-prototype repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 99.6 × 99.1 mm with 61 parts on 78 nets, routed with 345 tracks and 118 vias.
It is built around the NCE15P25JK, SK1010C and SMAJ6.0A, with the XT60-M among its other parts. Its parts include 22 connectors, 9 capacitors, 9 resistors, 7 diodes and 2 fuses. It belongs with the robots and motor control boards and the RP2040 boards of this library.
Main components
4
NCE15P25JK
TO-252-2L-55℃~+150℃ 1 P-Channel 1.5V 131pF 137nC@75V 150V 160W 160mΩ@4.5V 25A 7.65nF TO-252-2L MOSFETs ROHSWuxi NCE Power SemiconductorMOSFETs
SK1010C
SMC-55℃~+150℃ 1 Independent 100V 10A 250A 500uA@100V 850mV@10A SMC Schottky Diodes ROHSFUXINSEMISchottky Diodes
SMAJ6.0A
DO-214AC(SMA)-65℃~+150℃ 10.3V 38.8A 400W@10/1000us 6V 7.37V 800uA IEC 61000-4-2、IEC 61000-4-4 TVS Unidirectional DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHSLittelfuseESD And Surge Protection (TVS/ESD)XT60-M
THrough holeTHroughhole New Arrivals ROHSChangzhou Amass ElecUncategorised
README
README.mdHKU Martians Prototype Rover
Rudimentary 2-layer all-in-one Power Distribution Board (PDB) and logic carrier designed for small 6-wheel rovers with a 4-DoF robotic arm.
🚀 Key Specifications
- Dimensions: 99.57 x 99.06 mm
- Power Input: 6S LiPo (22.2V nominal, 25.2V max) via XT60.
- Power Tree:
- 12V @ 10.8A: High-current rail for BLDC/DC Main Drive motors. External module attached through XT30 connectors
- 7.5V @ 5A: Dedicated HV Servo rail (Optimized for 7.4V nominal servos). External module attached through XT30 connectors
- 5.1V @ 5A: On-board stabilized logic power for Pi 5 and peripherals. 3V3 Using Pico's built-in regulator.
- Processing:
- Dual-core architecture: Raspberry Pi 5 (Thinking) + Pi Pico 2 (Doing).
- UART communication bridge.
- Actuation & Sensing:
- 6x PWM Encoder inputs.
- 6x PWM-Controlled DC motor driver headers.
- 4x High-Torque Servo ports with localized bulk capacitance.
- Integrated 6S Battery Fuel Gauge (Voltage Divider + ADC).
🛠 Hardware Setup
Battery Monitor Calibration
The internal voltage divider uses a 100kΩ (Top) and 13.7kΩ (Bottom) 1% precision resistor set.
- Max Input: 25.2V
- ADC Output: ~3.03V
- Safety Factor: 10% headroom to prevent Pico ADC overvoltage.
Communication
The Pi 5 and Pico 2 communicate via UART.
- Baud Rate: 115200 (Default)
- Pinout: Pi GPIO 14/15 <-> Pico GPIO 0/1.
⚠️ Assembly Warnings
- Thermal Reliefs: High-current pads (XT60, Regulators, Motors) have thermal reliefs DISABLED. Use a high-power chisel-tip iron and pre-heat the board to 100°C for assembly.
- Capacitors: Ensure C1 & C2 (2000uF) is rated for 50V minimum.
- USB Isolation: Always use a USB isolator when debugging the Pi/Pico while the main battery is connected to prevent back-powering your PC.
📜 License
This project is released under CERN-OHL-W-2.0 license. Designed by Ilo Japar / HKU Martians.
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 2.54mm 5P Terminal Block | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-5P_1x05_P2.54mm_Horizontal | J11, J12, J13, J14, J15, J16 |
| 6 | 470R 0805 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R5, R6, R7, R8, R9 |
| 6 | JST-SH 3P | Connector_JST:JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J17, J18, J19, J20, J21, J22 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 4 | 2.54mm 3P | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J7, J8, J9, J10 |
| 4 | Green 0805 | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4, D5, D6, D7 |
| 3 | 0.1u 50V 1206 (C) | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2, C3, C9 |
| 3 | M3 3.2mm | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3 |
| 2 | 1000u 50V (E) | Capacitor_THT:CP_Radial_D13.0mm_P5.00mm | C1, C6 |
| 2 | 100k 0805 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | 470u 50V (E) | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C5, C7 |
| 2 | XT30-F | Connector_AMASS:AMASS_XT30PW-F_1x02_P2.50mm_Horizontal | J3, J5 |
| 2 | XT30-M | Connector_AMASS:AMASS_XT30PW-M_1x02_P2.50mm_Horizontal | J4, J6 |
| 1 | 100n 50V 1206 (C) | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C4 |
| 1 | 100u 50V (E) | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C8 |
| 1 | 13.3k 0805 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 14.7V | Diode_SMD:Nexperia_CFP3_SOD-123W | D1 |
| 1 | 15A | Fuse:Fuse_Blade_ATO_directSolder | F1 |
| 1 | 3.2~32V -> 5.1V 5A | Library:Buck_Converter_54x24mm | U1 |
| 1 | 5A 1812 | Fuse:Fuse_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F2 |
| 1 | NCE15P25JK | Package_TO_SOT_SMD:TO-252-2 | Q1 |
| 1 | Raspberry Pi 5 | Library:raspberrypi_2_3 | J2 |
| 1 | RaspberryPi Pico | Module:RaspberryPi_Pico_SMD_HandSolder | A1 |
| 1 | SK1010C | Diode_SMD:D_SMC_Handsoldering | D2 |
| 1 | SMAJ6.0A | Diode_SMD:D_SMA | D3 |
| 1 | XT60-M | Connector_AMASS:AMASS_XT60PW-M_1x02_P7.20mm_Horizontal | J1 |
Questions
How big is the PCB v0.3 PCB?
It measures 99.6 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PCB v0.3 use?
61 parts, built around the NCE15P25JK, SK1010C, SMAJ6.0A and XT60-M. 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 PCB v0.3 KiCad files?
From the iloevera/hku-martians-prototype repository on GitHub, at the commit this page was made from: the board is PCB v0.3.kicad_pcb and its schematic PCB v0.3.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PCB v0.3 design in my own project?
Its repository publishes it under the CERN-OHL-W-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).
Similar boards
- 2 layers158 × 63 mm
Oven controller
codeThatThinks/oven-controller-hw
A Raspberry Pi Zero-powered PID reflow oven controller -- PCB design files
66 parts5 - 4 layers165.2 × 72 mm
- 2 layers86 × 36 mm
Vacuum Tweezers
ARENARobotics/MiniPic
Open-source benchtop vacuum tweezer engineered for SMD soldering, rework, and precision part handling
31 parts3CERN-OHL-S-2.0 - 4 layers50 × 70 mm
Stm32-portable data logger
copperheadhq/copperhead-stm32-data-logger
Portable STM32L433 data logger, 50 × 70 mm, four layers, microSD, USB-C LiPo charging. Designed with copperhead. Never built: do not order expecting it to work.
90 parts3 - 4 layers46.3 × 37.7 mm
Interface
earlynerd/bl4818-servo-M23
This repository contains the electronics, embedded firmware, host software, and browser players for a network of brushless servo percussion actuators.
20 parts3 - 2 layers100 × 64 mm
Ac tester production
EVtivity/evtivity-ev-tester
An open-source, EV-side charging simulator. It emulates an electric vehicle so you can test AC charging stations (EVSE) and CSMS backends on the bench, without a real car.
68 parts3 - 4 layers100 × 50 mm
STM32H7 Board
phancak/STM32H7_Board
High-Performance STM32H7S3 System-on-Module | 600MHz ARM Cortex-M7 | External SDRAM & NAND Flash Integration | 4-Layer High-Speed PCB optimized for real-time control and LCD UI.
112 parts3MIT