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.

Connectors

• USB-C for power and data
• Qwiic connector for I²C sensors

Future Plans

• Add a boost converter and restore battery-powered operation

Libraries Used

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

Building One

Software Required

• The files were created in KiCad 8
• Clone this git repository recursively, i.e. with --recursive

Ordering PCBs

• 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, this PCB passes DRC based on JLCPCB specifications (other than the silkscreen of XIAO module being clipped by the PCB edge)
  • PCBA: I used [[https://github.com/bennymeg/Fabrication-Toolkit|JLC PCB Plug-in for KiCad]] to generate a BOM and CPL file compatible with JLCPCB PCBA

Ordering Components

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

Assembling the PCB

1. Solder U2 E22 module
2. Solder C1
3. Solder U1 XIAO nRF52840
4. Solder Qwiic socket

Flashing

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

Enclosure

A snap-fit 3D printable enclosure is available in the enclosures folder.

PCB Images