Robots and Physical Computing

Back to playing with TinkerCad in a previous post called  explaining-tinkercad-microbit-neural,  I used it to produce a simulation of a microbit-based neural network built around microbits.  If you haven't played with this free tool to TinkerCad  https://www.tinkercad.com/dashboard  from AutoCad, I highly recommend it as a versatile, simple CAD system (that includes coding for microbits) with a load of support material. If that wasn't enough, it is free and online. So, to experiment, I have made a simple traffic light simulator (an oldie but a goodie), so I can see what it can do a little more. Essentially, Red, Orange and Green LEDs (with appropriate resistors) are controlled by pins 0,1,and 2 on the microbit. So here is a circuit with a microbit. The anode (the one with the bent leg)connects to the microbit pins through resistors. The cathode goes to the ground connection. Here is the code for the microbit turning the LEDs on and off, and when it starts up put...