The effects of a certain pandemic revived videoconferencing as a form of communication, and if we need to send a quick voice message, there's always an instant messenger coming to the rescue. However, those willing to explore a DIY solution can invoke the spirit of the classic walkie-talkie and create a "telephone" based on Arduino Uno modules and a couple of cans…
A Classic with a Modern Twist
Two cans joined by a piece of string. The first telecommunication experiment for millions of people, and a source of inspiration for hundreds of years. There is always something irresistible about a simple piece of technology that works well, and to be honest, nothing stops us from giving that idea a 'modern' twist. So, with a pinch of creativity and a dose of humor, the proposal is to recycle the tin can telephone. How? Turn it into a walkie-talkie, with a couple of Arduino modules in the middle.
What You'll Need
Geoff from the channel Facio Ergo Sum explains the process: an Arduino Uno, an I/O expansion module, a microphone, an audio amplifier, an NRF24L01+PA transceiver, a speaker, a push button, a pack of AAx6 batteries, and a can... all duplicated. The can requires a bit of cosmetic surgery, and the glue gun doesn't take long to appear, but placing the components inside isn't complicated at all. Even simpler is the connection diagram. Geoff did a good job indicating the correct destination for each cable.
Wiring and Code
The last step (which should be the first) is loading the code onto the Arduinos. It's supposed to come ready to use, and requires no further modification unless you use a different transceiver module. Find a partner, turn on both cans, take some distance, press the button... and talk! If they hear you on the other end, ask them to respond. If you detect interference or strange noises, it's likely that some component has come into contact with the can. Everything should be well insulated.
Worth the Effort?
I admit that it's not practical or particularly economical to reproduce this project, but we've seen more absurd things in the past, and at the same time it serves as a good introduction to the fabulous world of Arduino hardware. On top of that, there's the possibility of modifying the format. Using cans has a certain comical profile, but if comfort is a priority, printing a couple of enclosures isn't a bad idea...
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