Let's Make Robots!

555 Timer Photovore Robot

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This is a simple robot that I made for my cousin, it only uses 2 LDRs, 2 geared motors, and a 555 timer IC.

I reused a Tamiya Tank tread kit and gearbox for locomotion. All powered by 4 AA batteries. The batteries, IC, and switch are all housed in an Altoids tin.

Not much more to say about this robot (Sorry OddBot) 

Requested pictures: 

Schematic I found from the internet.

There's not much to see on the inside because i DeadBugged the 555 Timer.


EDIT: As of July 25, 2012 this robot no longer belongs to me. It has been shipped off to Chicago to give company to my cousin.

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Sorry I was a bit slow in answering you, but this was cut and pasted directly from the Shout Box (with the times added by me).  I think you didn't wait long enough for the answer, but I wanted you to know that we did indeed answer.
SINCE this is from Shout Box, go to the bottom and read up towards the top.
Dan M: I did not breadboard it, but I do not spot anything wrong with the idea.
Dan M: photodiodes).
Dan M: It looks to me like that will work. (Cover both photodiodes and adjust the potentiometer for straight ahead, then uncover the
birdmun: 'llo ig
Dan M: @Towlieboy, and do I presume that the diodes you show are photodiodes?
kariloy: lol
Dan M: If you wire it like that, you would be able to manually adjust left to right motor to balance them. Was that what you wondered?
Bajdi: kariloy: 4 minutes to go :)
Dan M: Yes, thanks birdmun. I caught the earlier one. :-)
Dan M: You are asking about the changes you have for the 555 timer photovore bot?
birdmun: for dan :P
Dan M: @Towlieboy, yes?  [posted 05:54 PM]
birdmun: @towlieboy: I have it opened. I am juggling many things. I want to look up kariloy's mouse bot.[posted 05:53 PM]
Towlieboy78: guys?    [posted 05:52 PM]

Simplicity is bliss


Same circuit as in the Hivebugs! I love this BEAM design, its a great beginner project and tons of fun to make.

great concept! I like it alot......

This was my first robot I ever made. 

Well, that's a good decision, so you need to build another companion for yourself ;-)

I tried it last night and it's working. However, we started with 3.7V but it needs a bit more juice. Best running with 6V.

Now we got another simple line follower, with a 555...cool.


i am planing to build something like that only much much smaller


Remember to use high geared motors because this robot takes shallow turns, so a slow moving robot will perform better, that was the only real problem I had. I would also use a potentiometer in parallel of the LDRs to trim the sensors if needed.

Yes, we used small gear motors but no pot for the testing.