Smartphone / PDA / MP3 music player interface circuit diagrams / circuit schematics
Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy.
Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced.
For paid software / firmware / hardware design and consulting work please see Professional software development and electronic design in Hobart, Tasmania who
also serves international clients. For pre-built LoRaWAN IoT sensors with a turnkey web-based IoT monitoring platform please see Telemetry2U LoRaWAN IoT platform.