An(other) Arduino-Based Line-Follower Robot

29 10 2010

After more than half a year from the MadridBot competition, I’ve decided to rescue the documentation and pictures of the robot that we built for a line-following (speed) competition.

It’s basically a 1:28 scale RC car hacked with a servo for direction and an home-made arduino based board. In the front there can be seen 5 x CNY70 line sensors (IR reflection), shielded from light and crashes with foam. The rest of the car is described in the pdf below.

This has been the first competition robot we have made, and OK, I can say that I have learned a lot with it… Now I know that EVERYTHING can fail if you are sufficiently close to the challenge date. As any of my projects, the main reason to our partial failure was the lack of time (and planning). Apart from this, we had a very crude fight with some noise created by the DC motor, which interacted with the electronics of the servo. Eventually noise won, and we had to divide our power sources in two separate ones. Huge botch…

So, the competition day we met at 7:00 AM and tried to make some adjustments on the software, and we achieved speeds over 1m/s, what seemed a good value (although usually competition level line-followers reach up to 2.5m/s). But the funny part was this: We used to test the robot in a concrete, even surface; but the competition track was made from a soft foam, which was deformed by the weight of the robot, making the sensor array touch the ground and brake the entire car… Although this technical problem, we got the 12th position out of 40, and we spent a quite good time.

This is the document we attached to our inscription:

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4 responses

1 11 2010
Jon

Hombre! Este robot me suena, pero no me acuerdo ahora de qué…

21 11 2010
gizer20

Mola!!! iniciarse con un robot basado en un coche de radiocontrol es complicado así que considera un logro llegar al 12º puesto. Para el ruido lo que podeis hacer es una idea parecida a la jaula de faraday, envolved el servo en papel de plata. Es algo parecido a lo que usan en electronica de RF que ponen una placa de metal conectada a masa para no crear radiacion en la electronica de alrededor.

21 11 2010
vilxes91

Oye, muy buenas ideas!
La pena es que perdí una pieza del coche, y este año si competimos tendrá que ser con otro hardware… Aún así, y aunque creo que el ruido que entraba en el servo lo hacía por el cableado, me apunto lo del papel de aluminio, que he visto que se usa bastante en robótica.

4 06 2013
psychic

Good work. I honestly liked An(other) Arduino-Based
Line-Follower Robot | Warranty Voider. I trust you do not mind me saying this
but it reminded me of motorcycle gps navigation which I learned about on another niche
site.

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