Getting an old traffic light and wiring it up to do its thing inside your house isn’t exactly a new trick; it’s so common that it wouldn’t normally pass muster for these hallowed … ...

Our traffic light sensor has four pins: R, G, Y, and GND. We'll connect digital pins 9, 10, and 11 to R, G, and Y respectively, and the fourth pin, GND to a GND pin on our shield. Now open the ...

Going back to the garbage can example, you'll need a sensor, jumping wires, and a motor to make everything work. On top of all that, you'll need to program the device to do what you want it to do.