A compact LoRa hat for the LuckFox Pico Ultra and LuckFox Lyra Ultra SBCs, carrying a NiceRF LR2021F33 (LR2021 / LR1121) 1–2 watt LoRa module and an AHT20 temperature/humidity sensor.
Warning
The LR2021 module is not supported in any official Meshtastic release. A custom build of meshtasticd is required. Use the code from firmware PR #10567 and build from source.
| Front | Rear |
|---|---|
 |
 |
The PCB/ directory contains all files needed to order assembled boards from JLCPCB.
| File | Purpose |
|---|---|
| Gerber_PCB1_2026-06-28.zip | Gerber files for PCB fabrication |
| Gerber_PCB1_2026-06-28.csv | Bill of materials for JLCPCB SMT assembly |
| PickAndPlace_PCB1_2026-06-28.csv | Component placement file for SMT assembly |
- Go to jlcpcb.com and click Order Now.
- Upload
Gerber_PCB1_2026-06-28.zip. JLCPCB will auto-detect the board dimensions. - Set your desired quantity and any stack-up/colour preferences (defaults are fine).
- Enable PCB Assembly (PCBA) and select Standard PCBA.
- Upload
Gerber_PCB1_2026-06-28.csvandPickAndPlace_PCB1_2026-06-28.csvwhen prompted. - Confirm component matches — all parts are sourced from LCSC and should resolve automatically.
- Review the component placement preview, then proceed to checkout.
Note: The NiceRF LR2021F33 radio module is not available at JLCPCB and must be soldered by the end user. The module uses a castellated SMD footprint suitable for reflow on a hotplate. Order directly from NiceRF or search for "LR2021F33" on AliExpress.
Note: The recommended HAT connector is the Samtec ESW-113-23-T-D (DigiKey: ESW-113-23-T-D-ND). This is not stocked at JLCPCB and must be ordered separately and hand-soldered.
SPI must be enabled on the LuckFox before use.
Configure SPI0 with the following pin mapping: CS=10, CLK=8, MOSI=6, MISO=7. Maximum SPI speed: 2 MHz.
Enable the overlay luckfox-lyra-ultra-w-spi0-cs0-spidev via armbian-config.
Copy the YAML config to your Meshtastic config directory:
| File | Compatible boards |
|---|---|
| lora-lyra-ultra-LoRa2021F33.yaml | luckfox-pico-ultra, luckfox-lyra-ultra |
Pin assignments:
| Signal | Pin |
|---|---|
| CS | 10 |
| IRQ | 5 |
| Busy | 11 |
| Reset | 9 |
| SPI | spidev0.0 |
This work is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).
Commercial use of these designs is not permitted. You are free to build, modify, and share them for personal and non-commercial purposes, provided you credit the original author and license any derivatives under the same terms.
