A raspberry pi on wheels. See it working below.
This is my first real experiment with robotics. I've ordered the arduino car kit on the internet, but some parts went missing. So, instead of a arduino, I've used my raspberry pi to control the wheels. I wrote a simple flask server to expose the commands (go left, right, forward and backward) over the internet, that could be accessed by any device. Later I decided to use myChatBot to control the car.
This project was featured on HACKADAY - Control Anything With a Chat Bot.
You might have to add the address of the server as a trusted site, If you want to use the voice control without a SSL certificate.