This is a robot which carries a paper disc. Although handwriting is quite a difficult task for robots, this is an example of a writing robot.
http://www.geocities.com/davidvwilliamson/robot.html
This report describes the development of a vacuum cleaner robot prototype, both on software and hardware point of view.
http://www.engr.sjsu.edu/rkwok/projects/A%20Maze%20Vacuum%20Robot1.pdf
The design specifications of the robot are divided into the following mechanical and electrical subsystems: microcontroller, object and light sensors, and motor. The software is divided into seven different modules.
http://www.engr.sjsu.edu/rkwok/projects/SUMO.pdf
This is an observation to see how easy or difficult it is to emulate the behavior of a fly. Since it is technically a bit complicated to built a flying robot we will make it drive around instead.
http://members.home.nl/b.vandam/lonely/pagina11.html
This is to try the Sharp GP2Y0D340K infrared object detector. It is cheap, the disadvantage is that is will detect an object but it has no indication of the distance of this object. The detection range is highly reflectiveness (thus color) dependent.
http://members.home.nl/b.vandam/lonely/pagina22.html
You can build a simple robot from your old floppy-disk drive. Connect it to your computer using some simple circuit and give command from PC. It will move forward, backward and can perform other types of motion too.
http://www.tvdsb.on.ca/banting/ICE3M/unit6/floppy/
Here is a small robot that will run from sunlight. Just powered by a solar cell. Here are the circuit diagrams, assembly instructions, and the parts list.
http://www.xs4all.nl/~sbolt/e-fotovoor.html
The device is controlled by a PIC 12F675 microcontroler, and gives eight analogue outputs from one analogue input, and one digital input.
http://www.rmcybernetics.com/projects/DIY_Devices/homemade_sensor_multiplexer.htm