![]() I2S is used for simplicity, but there is no reason why analogue components couldn’t be used with a few code changes. The hardware is a collection of modules on a custom PCB, aside from the ESP32 there’s an I2S microphone and I2S audio amplifier, which along with battery and speaker are housed in a neat 3D printed case. It’s a memory conjured up for grown-ups by with his ESP32 walkie-talkie, which replaces a shaky 49MHz connection with one a bit more robust through the magic of WiFi. It didn’t matter that they were a very simple AM low-end-VHF radio with a range of about 500m and a Morse key of debatable utility, you could talk clandestinely with your friends, and be a more convincing spy, or commando, or whatever was the game of the moment. One of the most thrilling childhood toys for the adventurous 1970s or 1980s kid was probably the toy walkie-talkie.
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