@jack

thnx for directing me what to read first in wikipedia.....i was so confused but now i really have some image of microcontroller and now can understand how can they be so small

I wanted to know which components are there in micro controller and how they work and also what work they do in microcontroller  ? please explain or give links that provide the theory regarding it.
please do not explain in too technical language and if u want to use any technical term please explain it. And yes I am just a newbie at electronics.........
THNX a lot.

Buy servos with dual-ball bearings on the output shafts with metal gears. Sure, it's a lot more expensive up-front to do this; but with a biped and the load (lots of side load) on the shafts, if you don't, your decision to go "cheap" may end up costing you more in the long run than if you had spent the money on the more expensive option in the first place.

IOW - don't be "penny wise and pound foolish".

Thnx for the advise ..... No doubt you are right but unfortunately  my budget will not allow...I live in India where such servo is not easily available moreover if a servo is $10 here they sell for $ 18 and Indian rupees have less value than dollar . And if I buy from other online site like robotshop.com and other the import duties are double of the cost.

I think I should not be needing so much high quality as my robot will weigh 1-2 kg and small in size.

How do I find center of gravity

Hello there!
I am making a humanoid robot with arduino uno and Android........ I want to ask several question....ie

1how I choose the servo motor I mean how to calculate the torque needed
2) can and how I connect 10 servo to arduino uno and bread board with seperate powersupply
3)any good tutorial on humanoid structure (not biped plzz..ie not only legs)just for reference

  hey guys suggest me project ideas

Yes it finds targets and I am planning to shoot marbles or nerf bullets....or any other you can suggest

Shoot at targets which will be detected by ultrasound sensors

I am making one from scrap but with no success till now

http://www.robosoftsystems.co.in/roboshop/index.php/robot-kits/nexus-swarm-kit.html
 
Sensor only
 http://www.robosoftsystems.co.in/roboshop/index.php/sensors/grid-solving-sensor-module-digital-output-designed-for-nexus-competitions.html

Gripping module.:
 http://www.robosoftsystems.co.in/roboshop/index.php/mechanical-accessories/meccano-gripper-module-designed-for-nexus.html

Hello there,
I am an extreme amateur, 1st time builder. I am making a shooter robot and grabber.
My grabbing module is ready ...... But I am not able to make a shooting module.
Any ideas ?
Thank-you for your concern
Mohit Gupta