You could build a simple robot. Can you invest in a shield for your Uno? This would provide a driver chip for two motors, plus an interface for sensors, servos, etc.
Yes I can buy a motor shield but as I live outside the states, I find it difficult and costly for suppliers to ship the electronic goodies to me.
but, I have recently started using amazon and I found the service to be quite satisfactory… so I am wondering if anyone have tried/reviewed this motor shield kit from amazon
I got my motor shield from goodluckbuy for $19.50. The shipping is free to anywhere in the world. The shield is basically the Adafruit design, and it works very well. You can run a couple of stepper motors (easy enough to salvage from old gear) or 4 DC motors. I also soldered on a couple of male headers to run two mini servos, so I can sweep a rangefinder, and some female headers to get access to the spare Arduino pins.