CaribouLite RPi HAT is an open-source dual-channel software-defined radio (SDR) Raspberry Pi HAT – or rather uHAT – that works in the sub-GHz ISM range and optionally the 30 MHz – 6 GHz range for the full version.
Developed by Israel-based CaribouLabs, the micro HAT is equipped with a Lattice Semi ICE40LP1K FPGA, a Microchip AT86RF215 RF transceiver, two SMA antenna connectors, a Pmod expansion connector, and designed for any Raspberry Pi board with a 40-pin GPIO header.
CaribouLite RPi HAT specifications:
- FPGA – Lattice Semi ICE40LP with 1.28 kLE
- RF Chipset – Microchip AT86RF215 Sub-GHz / 2.4GHz transceiver
- Qorvo’s RFFC5072 integrated Mixer IC (for full version only)
- Tuning Range
- Full version – 30 MHz – 6 GHz
- ISM version – 2.4 – 2.4835 GHz
- CH2 – Sub-1GHz
- Max Sampling Rate – 4 MSPS
- ADC/DAC Resolution – 13-bit
- Max RF Bandwidth – 2.5 MHz
- Transmit Power – up to 14 dBm @ISM frequencies
- Frequency Stability – <±2 ppm
- Dual-half Duplex operation
- Clock – 26 MHz TCXO
- 2x SMA antenna connector
- Host interface – SMI (Secondary Memory Interface) interface to Raspberry Pi
- Optional GPS support with add-on
- Expansion – 8-bit PMOD connector for GPIOs, GND, 3.3V
- Misc – User switch and user LEDs, RF activity indication LEDs
- Power Supply – 5V via Raspberry Pi header; LDOs delivering 3.3V, 2.5V, and 1.2V signals
- Dimensions – 65 x 30 mm
- OSHWA certification – IL000002
The uHAT interfaces with the Raspberry Pi through the SMI (Secondary Memory Interface) of the Broadcom BCM2xxx processor which I don’t think I ever heard of, and CaribouLabs confirms the ” interface had not been fully investigated previously”. You can find more details on the Caribou-SMI API Driver page.
CaribouLabs has launched the CaribouLite RPi HAT on Crowd Supply with a $112,500 target. Rewards start at $69 for the CaribouLite-ISM (Sub-Ghz + 2.4 GHz), and $119 for the model supporting up to 6 GHz tuning. Shipping adds $8 to the US, $18 to the rest of the world, and deliveries are scheduled to start at the end of May 2022.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.