Let's Make Robots!

Turpis the robot

Navigate via bumper switches
Photo_58.jpg73.96 KB
Photo_60.jpg70.89 KB
Photo_59.jpg74.32 KB

Photo_59.jpgPhoto_58.jpgPhoto_60.jpgAs I previously stated:I've been working on my robot, and I honestly feel like a doctor in a third world country, I'm short on everything. I've run out of glue sticks for my glue gun, my microcontroller was faulty, so I had to replace it, the bumper switches were about 10x smaller than they should be, I don't have the right battery pack (a 9v will fry it), the back is severely sagging, I have nothing to cut my metal, I could go on and on! I've decided to name my robot "Turpis", and I don't know if it will work or not. Quite frankly I'm worried. I'm still confused as to which wires go where. Fear not, I am not deterred. I won't be defeated by a mere Turpis.This little fella has been a huge pain in the you-know-what. I'm goint head over to Radioshack to get a better powerpack, but I hae a feeling that I put the wires in the wring places (like the feeling I got when mouser sent me the wrong transistors).My room is now a total mess, and I couldn't cut the metal I have to make a frame for the motors.

As you can see in the pic of the microcontroller, the top 2 wires on the left go to the left motor. The top 2 wires on the right go to the right motor. The bottom 2 wires on the left go to the left bumper switch, and the bottom 2 wires on the right go to the right bumper switch. I tried to follow the datasheet instructions, but it had one image of the motors going to the top, and another of bmper switches going to the same I/O pins! Here it is: http://www.rev-ed.co.uk/docs/AXE023.pdf


Now that I've imputed the code I would like to thank Fritsl for supplying it on node 87. Thanks Fritsl! 


Help appreciated,



Brennon Williams

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
sweet  ^-^
Lol, tape is always the best structural tool :)

DUDE! haha! calm down! the beginning is always hard. the main thing is not to start with a GREAT project. i never finished my first robot(http://www.youtube.com/watch?v=P3B6PA9skwY), but i don't give up. you will need some instruments for sure, but you have bigger problems first. your chassis won't work. i hope i'm wrong, but i think you don't really have any idea how the robots move. you just can't use 4wheels for chassis with 2 servos(well, you can, but it's deffinetly not a good idea) here is some help - http://www.societyofrobots.com/robot_tutorial.shtml. there are a lot of tutorials there, which might be REALLY helpfull. hold the project for a while, read everything you are interessted in and than start from the beggining. i'm newbie too, so i'll just shut up now, but i think everyone here will tell you the same - the chassis sucks. keep going!


Here is another guy's opinion:

Stop reading so much, just add more tape (since you do not have melt-glue)!

Nobody gets anywhere in building by reading. It is from building you learn how to build. What good is it to read about how to .. when you have never even tried to ..

Reading is only when you know what your problem is and not when everything is a mess! 

Do not concentrate on it all at once; Get a LED flashing, a motor running.. get one step going 100% at a time... and build on top of that; On your robot, ind your mind.

Finish one step (like power to the darn thing), make sure it works (tape & glue often helps here). And THEN plan the next step..

i definitely got your point. and i work just like this - without plan, without much reading. but he allready have a problem, so a little knowlidge might be helpfull. but like i said - i'll shut up for now, because i'm not a pro. not at all..

wish you luck Brennon!

Your motors are not geared, are they? They need to be.

Anyway; I think you are doing well, you just need some more tape! 

Can you explain why motors have to be geared? I understand gear ratios (was actually going to post a tutorial on it soon), but not why motors need to be geared. I am assuming it has to do with not burning them up when starting or stopping...

Have a drivers license? Tried manual (knowing you are from the US)..well.. if so, try to start your car in 5´th gear.. It will not!

The speed of the little motors are high. Very high. Even my wall-racers are geared down, my guess is 50:1 And they are fast (even with small wheels which is acting as a down-gearing as well). if the gearing was not there, they would not be able to start: High speed = low power, low speed = high power.

You need a gearing that can both suply enough power for your bot to start up, bot not so heavy (slow) that you fall asleep before it has moved an inch :)

I have seen one bot without gearing. It was FAST, and the wheels was SMALL (this helped, if not, it would not work), it was able to skid (motor could get it's turning).. it was light.. and I also think it got way too much power:


- And then there is of course the solar-powered little things, where there is no wheel, just some plastic around the shaft (=VERY small wheels)

I always recommend high gearing (200:1 or something like that) for beginners projects; It makes the robot much stronger, and so it is more forgiving. And, it makes it slower, which makes it easier to capture what on earth it is doing / bugtrack.

Hmm.. I think this could be useful to many - I often see people try with non-geared motors.. Hmm.. Will make mini-walkthrough.. 

I have a drivers license and my car is a 6 speed manual ;) I know how that works I just wasn't 100% sure why you said he had to use gears. I know why I will use them on my next bot I just didn't get the exact reason. It makes sense tho...