I was trying to make an interactive robot long time but making one is not easy if you don't know any electronics or special programming languages. Now there is a programming language called nqBASIC, that is totally free, to make your very own robot.
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Signing UpStep 1What you need?
1) Go and find an RC car that has two DC motor in it. I found a very cheap car called thunder tumbler for $12.
Picture is below.
2) You will need a Servo Sensor controller card called SSMI. Here is the link to get it
http://www.technologicalarts.ca/catalog/product_info.php?currency=USD&products_id=276
3) You will need a micro controller for this board called NanoCore12DX
http://www.technologicalarts.ca/catalog/product_info.php?cPath=50_36_92&products_id=429
4) You need two sensor if you want to make your robot interactive
http://www.technologicalarts.ca/catalog/product_info.php?cPath=25_147&products_id=188
5) Serial cable to connect your computer to your robot to program.
http://www.technologicalarts.ca/catalog/product_info.php?cPath=26&products_id=38
6) A cool robot language developed for this product is called nqBASIC. Go to http://www.nqbasic.com and download for free. You can also ask questions from their forum.
7) 4 AA batteries (alkaline or rechargeable)
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If you think its expensive there is a cheaper way to do it.
Here is the link.
http://www.technologicalarts.ca/catalog/product_info.php?cPath=50_36_91&products_id=524&osCsid=e9915a576fe62a123ae25700fd603786
You have to do some wiring.
Best Regards.