The Dagu line tracing car V2, has a linear tracking feature that allows the car to identify and follow a route drawn by the user. Simply draw a line (in black) on a white background and the car will do the rest! The car uses two receivers and two infrared diodes which sense ground colors to identify it's route. The car has a very simple structure but is lively and fun and is suitable for the electronic novice to intermediate roboteer.
Power source: 3V (2 x AA batteries required)
Power consumption: 100mA, MIN: 60mA
Size: 140 x 125 x 40mm
Please note: This product is supplied in kit form and requires assembly and soldering.
On the plus side there are lots of parts, all of decent quality. Putting it together is fun and will give you lots of soldering practice. The instructions are minimal, but adequate for assembling the thing. The instructions are completely lacking when it comes to running the thing however, which leads us to the minuses.
It doesn't really work very well. There is no micro-controller chip, just a simple comparator providing 'bang-bang' control. This makes the circuit easy to understand, but makes the robot lurch around badly. My son was extremely disappointed with its crappy performance - but he did enjoy the build.