This is a great because it comes ready made with two h-bridges and a steering mechanism already built. The cost of the whole project is probably $90 if you don’t have any of the materials but for me I was about $3(for the batteries).
This test shows how the robot works. I didn't have a large enough space to test it while it moved. And I also had it running the dark seeking sketch.
Because i'm entering this in the robot contest I'd like to say i'm 13-18 years old and belong to the 401 venture company (scouts).
Step 1: Materials
1x Arduino (I used an Uno but any will do)
1 x Breadboard
1 x 9v Battery
1 x 9v to Arduino cable (link to make your own)
1 x Arduino to USB cable
1 x R.C Car
2 x LEDs (hopefully the same)
3 x AA batteries (for the car)
About 50cm of four strand wire
15 – 20 jumper wires
A few elastics
Some electrical tape
Some solder (lead free)
Third Hand (for soldering)
Computer (with Arduino software installed)
Step 2: Taking Apart the Car
Next we need to take the screw out of the PCB (Printed Circuit Board) so that we can more easily access the brain of the car.