Modular & Small like never before!
Hardware design files, schematics, and 3D models for KIISU SMOL — a modular networking development board built around the STM32WB55 with Flipper Zero firmware compatibility and pluggable expansion modules for Wi-Fi, GPS, LoRa (Meshtastic), NFC and RFID.
KIISU SMOL is currently crowdfunding. Back the campaign and get yours:
- Main MCU: STM32WB55RGV / STM32WB55VGY (Cortex-M4, 64 MHz, 1 MB flash, 256 KB RAM)
- Sub-GHz: CC1101 (300–348 / 387–464 / 779–928 MHz)
- NFC: ST25R3916 (13.56 MHz, ISO14443 / ISO15693)
- RFID: 125–132 kHz
- Bluetooth: built-in with antenna
- IR: receiver and transmitter
- Display: 128×64 OLED (SSD1306-compatible)
- GPIO: 2×12-pin, 2.54 mm pitch, Flipper Zero pin-compatible
- Storage: soldered 512 MB SD
- Power: USB-C, LiPo connector, on-board 5 V → 3.3 V LDOs
- Dual-Band Wi-Fi / GPS / SD (ESP32-C5)
- LoRa (Meshtastic-compatible, SMA connector)
- NFC / RFID + LIR2032 add-on
| File / Folder | Description |
|---|---|
kiisu smol v1a schematics.pdf |
KIISU SMOL V1a schematics |
kiisu smol v1a model.step / .glb |
3D model of the main board |
kiisu smol kicad extension board/ |
Sample KiCad project (CR2032 expansion board) and 3D packages |
- Main firmware (Flipper Zero–compatible):
kiisu-smol-firmware
- Direct (EU): https://store.rainwalker.ee/
- Indiegogo (worldwide): https://www.indiegogo.com/projects/rainwalker/kiisu-smol---networking-development-board
- 💬 Discord — https://discord.gg/kiisu
- 📰 Reddit — https://www.reddit.com/r/KIISU_IO/
✈️ Telegram — https://t.me/kiisu_io- 📸 Instagram — https://instagram.com/kiisu.io
- 📘 Facebook — https://facebook.com/profile.php?id=61576595588296
Hardware design files (schematics, PCB project, 3D models) are released under the CERN Open Hardware Licence Version 2 — Strongly Reciprocal (CERN-OHL-S v2).
Documentation, manuals and this README are released under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).
Note: the previous internal name of this board was Kiisu Mini. Some artifacts in the KiCad sample project (
km-2032,kiisumini.step, etc.) still carry the legacykm/kiisuminiprefix to preserve internal references.
Made with ♥ by RainWalker OÜ · Tallinn, Estonia