Discussions about URB here: https://forum.arduino.cc/index.php?topic=578952.0
Yes, this is my site – http://arduinorailwaycontrol.com/index.php#aboutme
Introdution I2C bus – http://arduinorailwaycontrol.com/arduino.php#introduction-to-I2C-bus
I think you can use any children's railway and a train with an electric motor. Only a large locomotive size is desired.
For example: https://www.youtube.com/watch?v=edEst3GmzQA
You can see the application of these sensors in my new video about the railway interlocking system – https://www.youtube.com/watch?v=1TdhZOkEtoc
Otherwise, children (or cats) will very quickly disassemble the project. According to my statistics, the child tears the wires for tens of seconds, the cats disassemble the train for several hours :)
ESP8266 is very good! ESP32 is even better. But for this project, they are redundant.
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