I'm suggesting a video on the PJON communication protocol which is a very comprehensive library that lets multiple arduinos comunicate over a singe wire bus
The PJON protocol has many possibilities that obviously couldn't be covered in a single video but I've just started playing with this and find it a very interesting topic.
I simple example using a single or two-wire bus with three arduino nanos would be enough to get people started.
Apart from the PJON documentation, there is very little content on the internet so a DroneBot would be be very informative.
Thanks in advance