"We are not preceducing products," My electronics teacher said. "we are learning."

In fact, ALL of the problems I am facing can be solved by this way:

Need more power? Lithium batteries;
Motor with low current? Servo;
Motherboard? The MIT's "Handyboard";
Motor Driver? The drivers for model cars and ships;
Sensors? Do a search and you can find many many well-done modules, cost between US$10 to US$40.
The robot body? You pay $ and the workshop will make one for you.
Don't know even how to build the robot? The teachers will build it for you.
... ...

These happened in the other schools: The school give the teachers money, buy parts, spent a huge amount of money to WIN, so their school becomes famous.

There are always some well-done parts for you, only if you have money. My teacher don't want me to use those parts. He said we can learn nothing by that. For sure we will WIN if we buy those, and we will be fighting with money. Driver chips...motherboard...sensors.....

That's why I design the sensors by myself, soldering by myself. If I buy a H-bridge driver, will I understand why the motor turning? Can I improve my soldering skill? Do I need to know what 7805 do? Do I need to learn how op-amps work? No.

Stanley