Boards in 2 GitHub repositories, designed in KiCad, that use the PCA9539PW by NXP Semiconductors (-40℃~+85℃ 16 1uA 2.3V~5.5V 4 400kHz I2C、SMBus Interrupt Output Reset function、Cascading and address extension TSSOP-24 I/O Expanders ROHS). See how each wires it, with its parts, size, README and files; the PCA9539PW’s symbol, footprint and pinout are on its own page.
PE1RGU/hf-antenna-switch
Remote HF antenna switch: 3 radios x 4 antennas (path to 8), outdoor relay unit with a hardware safety chain, controlled over Cat6 from a shack interface. KiCad 10, open hardware, designed together with an AI.
entropia/Teebeutel-Hardware
Teebeutel (eng. Teabag) is an electronic, Entropia themed con-badge for the GPN20, featuring an ESP32 microprocessor running micropython.
PE1RGU/hf-antenna-switch
Remote HF antenna switch: 3 radios x 4 antennas (path to 8), outdoor relay unit with a hardware safety chain, controlled over Cat6 from a shack interface. KiCad 10, open hardware, designed together with an AI.