Let's Make Robots!

Standard Tracked Robot

 
Goes around avoiding obstacles

This is a simple tracked robot, based mostly on standard entry level components: picaxe, sharp sensors, l293d driver, tamiya motors. I'm mainly reusing them from my first robot, apart from the motors.

The chassis is made by two custom hand-sawed "plastic glass" sheet, distantiated by long screw. I used a lot of L-shaped components to secure the wheel axels and the sensor. The final structure is rock-solid.

This time i also added a switch. I was tired of connecting and disconnecting the "9V like" connector. If anyone is in my situation, i can guarantee: it's worth the effort :)

So sorry if this is yet another standard design robot, i'll try and make something more interesting asap :)

 

Pictures and videos:

 

track2.jpg

 

track3.jpg

 

track4.jpg

 

track5.jpg

 

 UPDATE 11/09/2008

As suggested in the comments, i decided to add another distance sensor. This will he hosted higher, so that the robot can tell if the obstacle is high or low. If it's low, the tank will of course use the his mighty powerful tracks to climb over it :) If it's high, it will use the servo to search for an "exit" and go that direction.

Actually i don't have a spare Sharp sensor, so i just mounted the servo. It fitted perfectly between the mounting of the original  sensor, just in front of the motors.

 Here's some pictures :)

 

1001034lj4.jpg

 

1001037js3.jpg

 

1001038nt3.jpg

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I  see a tank! Awsome! great forward thinking with the power switch. You have built a First class robot. Now you should go beat up bully bot.  just a thought.

a pirate bot :) ? i really like the chassis you made, it looks well made and i really would like to have something similar for my bot. What tools did you use for the cutting?

i used a plain old saw.. no fancy laser cutting here :( i drawed the lines with a maker and a try square and followed them

The sheet of plastic glass was about 25x50 cm, 4 mm thick. I sawed a a strip of 6,5 cm and then cut in two to make the two decks. For the holes i used a hand drill, all bolts are 3 mm, of various length.

The sintetic glass had a label that said: "you can saw it, you can drill it, you can hot-bend it, etc", and indeed the sawing was clean, no debris or erosion or cracks, i just sanded the edges slighly and it was ready. It's also very very transparent, almost like real glass.

normally the point of having a sensor is so that it can avoid obstacles but all yours does is run them over :)

Loool, you're right :) The thruth is that the videos were taken when i still had to mount the sensor, so it did just run forward and nothing else :) It was to demonstrate its climbing abilities!

Maybe i'll take another video of the robot avoiding obstacles :)

You could use the sensor to check if the object is flat enough to be run over or if the 'bot should drive around it.
Or save the programming just mount the sensor high enough so that it doesn't seek objects that it can destroy :)

Uhm not bad, i think i will go for this option :)

I don't think so. It goes over the stack of books in the video, because they are arranged like stairs, where each step is relatively low. What if the books were stacked, so the robot hit a wall? Would it climb over them?

Sure, the bot can easily climb vertical wall, thanks to some sticky paste i used on the tracks.

Ok, just joking :) it doesn't climb walls. Anyway the idea still apply becouse the sensor is low enought now to sense very short obstacles. Making it some centimeters higher should avoid sensing short steps