mobile robot motor problem

[weijie]

Hi guys ,
I am currently doing a project using tamiya gear box with motor for my mobile robot.
The major problem that i face is that the motor don seems like able to run the robot.
Do u guys have any suggestion to solve this problem?







Is changing the motor a good way of solving?
Potential motor:


Please advice !

[SmAsH]

Well, if you mean the motor can't move the robot because its not strong enough. Then yes, you will need to upgrade the motor or reduce the robot weight.

[weijie]

I change the gear ratio from 58:1 to 208:1 , resulting in a higher torque and lower rpm. Problem solved 

What is the recommended way for bi-directional communication (wireless) with user controller ? i need to get some data from mobile robot while asking the robot to do some job.
I need some circuit/schematics .
Thank you !

[waltr]

For wireless it is best to buy RF modules as designing and building them is not trivial. If you need bi-direction communication then the choice is either modules with full bi-directional capability or modules on different frequencies one to send to the robot and one to receive from the robot.

SparkFun has various RF modules that would work.
http://www.sparkfun.com/commerce/categories.php

[weijie]

thanks for the infos . i will try and build first before sharing the results here