IR obstacle detection Robot

Today, I happened to come across this website, describing how to build a very simple robot without any electronics knowledge. It’s very interesting and easy. But it suggests a budget of over $110 which is very high for such a simple robot.
Therefore I decided to design and build one with the same functionality but lower cost.
Let’s see how much it would cost approximately (I got all the prices from ebay):
Arduino UNO                – £15
Servo                           – £3 (usually sold in bulk)
IR distance detector      – £2 (will only need 2 or 3 units, I bought 10 from China for £3 ;-p  )
Motor Driver (L293D)     – £2 (cheaper than building one yourself!)
Gear Motor                   – £13 (better than using the motor directly as we need higher ratio, slower movement)
9V PP3 battary               – £3 (I use rechargeable so more expensive)
resistor/capacitor/wire     – £2
Optional:
other accessories          – £5 (varies really)
Wheels                         – £7 (or £0 if you could make some yourself)
Total                              —– £40 to £52 (which is $62 to $80 on today’s exchange rate!)
I have divided the robot into several parts, and we will be building and testing each part before we put them together. The green arrow indicates the interactions between these parts.

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