ism-band

A python program for 2-way texting with the 33cm band [REYAX RYLR998](https://reyax.com/products/rylr998/) LoRa® module, either with a Raspberry Pi 4, five wires and ten female-female GPIO connectors; or with a Linux PC running a CP2102 USB 2.0 to TTL serial converter, four wires and eight female-female GPIO connectors. No threads, only async

CC1101 + nRF24 dual-band RF expansion module for M5Stack Cardputer ADV. Supports 433/868/915 MHz Sub-GHz and 2.4GHz. Hardware auto-switching, Bruce firmware native support. Setup guide, pin reference, and troubleshooting docs.

ESP32 + CC1101 RF spectrum scanner and Morse communicator

STM8S003F3 nRF24L01+ wireless receiver - bare-metal firmware (SDCC + IAR)

An rtl_433-compatible multi-sensor system

Telemetry Tracking & Reporting System

2.44 GHz ISM-band microstrip inset-fed patch antenna and 2x2 corporate-fed array designed on Rogers RO4350B substrate. Includes Mathcad analytical synthesis, CST Studio Suite 3D electromagnetic simulations, and mechanical CAD enclosure models licensed under CERN-OHL-P v2.

Long-range LoRa® breakout board based on the Ebyte E22-900M22S and Semtech SX1262 transceiver.

869 MHz rectangular microstrip patch antenna on FR-4 substrate with a quarter-wave matching transformer. Includes analytical Mathcad calculations, full-wave 3D CST Studio Suite models, transient EM analysis, VSWR/Z-parameters optimization, and farfield directivity patterns under CERN-OHL-P v2.

A realistic CubeSat hacking platform — flat-sat satellite, ground stations, software simulator and a 12-step curriculum. Build it from breadboards and Pi Picos, or run it on your laptop.

Square microstrip patch antenna design at 2.4 GHz using MATLAB Antenna Toolbox — FR4 substrate, full RF characterization.

ESP32-based BLE scanner and relative 2.4 GHz RF activity monitor using single and dual nRF24L01 implementations, with Processing, C++, MATLAB, and Python tools.

A 915MHz radio w/ temp sensor, pressure sensor, LED and ATMega328p

Low-power 433 MHz OOK RF receiver module designed for wireless DIY projects.