While this is a fairly intricate robot, some of the motor techniques and circuits can be used for other simpler robots.
This instructable shows how to:
1-Use a Picaxe controller to receive remote control signals from a standard universal TV remote.
2-Use a Picaxe controller to interface with an infrared distance sensor.
3-Send serial commands to a serial motor controller or serial servo controller.
4-Make a simple one servo robot gripper.
The video shows the robot using infrared to locate and pick up a wooden block. It also shows that like most ants, the robot ant has a certain disdain for its puny human masters.
Step 1: How It Works
It also uses serial commands to control a servo controller which positions the three servos which operate the body, head and gripper movements.
It can be controlled by a standard TV remote control or it can operate autonomously.
The robot ant uses modular construction. Each circuit is a module that plugs into .1" header sockets. This makes it easy to test each circuit on a breadboard before it is installed. It also makes the modules available for the next robot or other project.
For details on making these modules see: http://www.instructables.com/id/Picaxe-Projects-1-Making-Fast-Printed-Circuit-Mo/
The robot ant is about 12 inches long and was made intentionally larger than necessary to allow room for more circuits. I intend to use it as a test platform for skin sensors and antenna sensors that I am working on.