Mastering Bitcoin 3rd Edition - Programming the Open Blockchain

SI473X Library for Arduino

Documentation and help with the ESP8266 chip/boards/modules

Ham Radio hat for Raspberry PI

A second generation low-cost amateur HF software defined radio transceiver.

TR-9 - M17 protocol compatible handheld - schematics, PCB design files, BOM.

Arduino Library for SINGLE-CHIP BROADCAST FM RADIO TUNER RDA5807

ADX - Arduino Digital Modes HF Transceiver

A simple and easy Arduino / Pi Pico / ESP8266-powered WSPR, FT8, and FT4 beacon system which uses NTP + DS3231 RTC for timing. Super extensible! Now comes with optional GPS support.

JDY-08 Bluetooth transparent transmission module, with resource for KiCAD

QN8066 TX FM DSP Transmitter Arduino Library

Project of 600 W LDMOS amlifier based on 2xMRF300.

A small CM108 USB radio interface providing audio, PTT and Squelch lines. PCB fits into a 9 pin D-Sub connector.

A simple Python AIS parser intended for casual use.