Here the another Line Follower robot tutorial… The robot mechanical design not included, you may create the shape and the mechanical design of your line follower robot by your self. Just use motor gearbos which have high torque… 
This line follower robot use the following module:
Here the complete robotics tutorial based on youtube video. There are 40 long time videos which will explain about robotics. Tired to watching this video online..? Then try to download the video using keepvid.com.
Lecture 1. Introduction to Robotics
Lecture 2. Technologies in Robots
Sound activation also knows as tone detector is one of sensing system that usually used for robot start up activation. When some frequency have received by microphone in this circuit, then the robot will start to move.
I’ve collected some schematic diagrams of sound activation as follow:
Sound Activation schematic 1
Sound Activation schematic 2
