GitHub repo: https://github.com/ndoo/ikoka-nano-meshtastic-device

A Meshtastic device based on the Seeed Studio XIAO nRF52840 and EBYTE E22-XXXMXXS series LoRa modules. Pinout matches the Meshtastic xiao_ble variant.

The focus is on small size without an onboard display or buttons, meaning it must be used with Meshtastic client software, or as a remote repeater managed with remote node administration.

• JST PH (2mm pitch) connector for 1S LiPo
• JST PH (2mm pitch) connector for solar panel (TI BQ25100 charge IC on XIAO nRF52840, max 6.45V), connected to USB 5V
• Qwiic connector for I²C sensors

• SnapMagic E22-900M30S footprint & symbol
• SparkFun KiCad Libraries (@v1.1)
• SeeedStudio OPL KiCad Library (forked to add missing XIAO nRF5240 symbol)

• The files were created in KiCad 7
• Clone this git repository recursively, i.e. with –recursive
• Ensure the SparkFun library is at v1.1:
  • cd symbols/SparkFun-KiCad-Libraries
  • git checkout v1.1

• Follow the instructions to generate Gerbers at your PCB house, e.g. JLCPCB PCB Files Preparation
• Default 1.6mm 2-layer PCB settings should work well
• PCBA: I used JLC PCB Plug-in for KiCad to generate a BOM and CPL file compatible with JLCPCB PCBA

• LCSC
  • 1* EBYTE E22-900M30S
  • 1* JST SM04B-SRSS-TB(LF)(SN)
  • 2* JST S2B-PH-SM4-TB(LF)(SN)
  • 1* Murata GRM31CR60J107ME39L
• Seeed Studio
  • 1* Seeed Studio XIAO nRF52840

(TODO)

Follow the instructions at meshtastic/firmware/variants/xiao_ble/.