They used the webaudio API to send serial data to a remote Arduino. The hack uses a FET, a capacitor, and a few resistors. They didn’t quite build a real modem with the audio.

The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.

The Arduino GIGA Display Shield is a versatile, user-friendly solution for GIGA R1 WiFi projects. Its innovative design, advanced features, and seamless integration make it a valuable addition to ...

For more details on how to build your very own DIY Arduino radar jump over to the official GitHub page and Thingiverse for the files to 3D print the enclosure and radar dish. Source: AB Share ...