4 layers19.6 × 42.2 mm
PicoROM
schenkmi/electronic-retro-computing-projects
In revision 2, the PCB size has been reduced by more than 50% and TAPuino support has been ditched. It now features a Micro SD slot and a few other improvements.
49 parts
2 layers50 × 50 mm
HolidayExpress
joshkephart/holidayExpressesp32 project for a Lego train motor and servo control
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 54
- Pads
- 158
- Tracks, vias
- 161, 106
- Pours
- 16
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Dec 2024
- Updated
- 27 Jul 2025
Overview
HolidayExpress is an open-source printed circuit board by joshkephart, from the joshkephart/holidayExpress repository on GitHub. It is a 2-layer board of 50 × 50 mm with 21 parts on 54 nets, routed with 161 tracks and 106 vias.
It is built around the MPM3610GQV-P, DRV8833PW and SML-D12M1WT86. Its parts include 8 capacitors, 5 resistors, 4 connectors, 3 ICs and 1 diode. It belongs with the robots and motor control boards and the ESP32 and RISC-V boards of this library.
Main components
3MPM3610GQV-P
QFN-20(3x5)-40℃~+125℃ 1 1.2A 1.6mm 200uA、700uA 2MHz 3mm 4.5V~21V 5mm 800mV~18.48V Over-temperature protection、Over Current Protection、Under Voltage Protection、Automatic fault recovery、Programmable output voltage、Light load efficient mode Step-down type QFN-20(3x5) DC-DC Power Modules ROHSMonolithic Power SystemsDC-DC Power Modules
DRV8833PW
TSSOP-16-40℃~+85℃ 2 2.7V~10.8V 360mΩ 500mA Bipolar Driver Yes TSSOP-16 Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
SML-D12M1WT86
0603-40℃~+85℃ 2.2V 20mA 40mcd 54mW 572nm Discrete Diode Frosted White Lens Top-mount Yellow Green 0603 LED Indication - Discrete ROHSROHM SemiconductorLED Indication - Discrete
README
README.mdholidayExpress
Lego motor control using an esp32 and custom board.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10uF | Capacitor_SMD:C_0402_1005Metric | C1, C3, C9 |
| 2 | 22uF | Capacitor_SMD:C_0402_1005Metric | C2, C6 |
| 2 | motorPower | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1, J2 |
| 1 | 0.01uF | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 2.2uF | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 24k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 2k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 75k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | DRV8833 | Package_DFN_QFN:Texas_RTY_WQFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm_ThermalVias | U2 |
| 1 | ESP32-PICO-MINI-02 | PCM_Espressif:ESP32-PICO-MINI-02 | U1 |
| 1 | MPM3610GQV-P | footprints:QFN3p0x5p0x1p6_MPM3610_MNP | U3 |
| 1 | SML-D12M1WT86 | footprintDownloads:LED_SML-D12M1WT86 | D1 |
| 1 | UARTprogrammer | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | batteryPower | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
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Questions
How big is the HolidayExpress PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HolidayExpress use?
21 parts, built around the MPM3610GQV-P, DRV8833PW and SML-D12M1WT86. 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 HolidayExpress KiCad files?
From the joshkephart/holidayExpress repository on GitHub, at the commit this page was made from: the board is KiCad/holidayExpress.kicad_pcb and its schematic KiCad/holidayExpress.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HolidayExpress design in my own project?
Its repository states no licence, so its author keeps all rights: ask joshkephart before reusing the design.