Robot chassis - 2WD with encoder discs.
With a robot chassis like this, you can take your Arduino to the next level of using it as a robot car.
To get going you will need an Arduino, a motor driver board that can drive at least two motors and a way to control it like an IR remote control.
To that, you can add all kinds of sensors like an ultrasonic sensor to avoid walls etc. To make it even more impressive you can add a Bluetooth module to control it from your cell phone.
We will soon have more time on our hands and we will play a bit and create a couple of block posts with great examples.
Note: Infrared Motor Speed Sensor not included