This time, I made more simple object just for joy. the above picture shows the object buried inside epoxy resin. Indeed they are object for N-gauge model train, and I added several tiny (1005 (0403)) size LEDs for headlight of car, traffic signals. Just turning on is not so interesting, so I put Arduino boot loader loaded ATmega328 below the basement of traffic signal. I made it looks like the car is ready to fly!!
And here is the completed one. Signal is controlled by MCU and actual operation can be found in the following movie... Have fun!