Lichee-Jack PCB

This repository contains the open-source extension board system for the Lichee-Jack project. It includes multiple PCBs, FPCs, stack-up boards, and extension modules designed to expand the capabilities of the LicheeRV Nano.

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Overview

The complete hardware system consists of three main boards:

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1. Lichee-Jack_EXT_BOARD

The primary functional PCB containing:

• Battery management system
• WS2812 RGB LED
• SP3T control switch
• Peripheral support circuits
• PCB thickness: 1.6 mm

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2. Lichee-Jack_EXT_BOARD_FPC

A flexible cable connecting:

• LicheeRV Nano ETH pads → EXT board ETH pads
• LicheeRV Nano CSI pads → Header board
• Extra signals for extension modules

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3. Lichee-Jack_HEADER_BOARD

Adapter board for:

• 1.27 mm 2×10 SMT header
• EXT_BOARD_FPC
• PCB thickness: 0.8 mm

Used by external extension modules.

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Assembly Notes

Important: Follow recommended solder temperatures to avoid damage.

EXT_BOARD

• Use high-temperature solder paste (Sn63/Pb37 or SAC305)

EXT_BOARD_FPC

• Solder with standard soldering iron

Header Board

• Use high-temperature solder paste

LicheeRV Nano + EXT Board

• Use low-temperature solder paste (Sn42/Bi58)

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Battery Information

• Recommended: Li-Po 3.7V 200mAh
• Model: 402030
• Fits the 3D-printed enclosure included in the repo

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5V Power Notes

The LicheeRV Nano shorts VBUS ↔ VSYS using a 0Ω resistor (marked "5V").

To safely power externally:

Remove the 0Ω resistor on the bottom layer.

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Assembly for 3D-Printed Case Compatibility

To fit the Nano + EXT Board inside the enclosure:

1. Remove CSI Connector

• Desolder the CSI camera connector on the LicheeRV Nano

3. Install Header Board

• Solder SMT connectors based on BOM

4. Connect FPC

• Solder EXT_BOARD_FPC between the Header Board and the LicheeRV Nano

5. Ethernet Wiring

• Use short 4P or 8P RJ45 cable

• Solder wires to EXT Board ETH pads:

  • WOG, OG, WG, G → pins 1, 2, 3, 6

• Crimp 8P8C connector to cable end

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PCB Assembly via Manufacturer

You may order PCBA for the EXT_BOARD using:

• Gerber files
• BOM
• CPL

Manufacturers (JLCPCB / PCBWay / Seeed) will assemble only the EXT_BOARD. The LicheeRV Nano must be soldered manually unless custom services are arranged.

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PCB Version History

Always use the latest revision.

v1.0 → v1.1

• Added missing Schottky diode between PWR_IN → PWR_OUT
• Fixed boot issue by rerouting SP3T pos1 from GPIO-A16 → GPIO-A15
• See diagram:

v1.1 → v1.0.32 (EXT_BOARD)

• Fixed UART0-RX conflict (GPIO-A17)

• Rerouted pos2 → GPIO-A24

• Added speaker pads

• Replaced old ETH-FPC system with:

  • Stack board
  • Header board
  • New EXT_BOARD_FPC

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License

Licensed under GNU GPLv3.

You are free to use, modify, study, and redistribute this project under the same license.