Let's Make Robots!

any schematic design for brainless/no PIC/no microcontroller. avoiding obstacle robot??

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guyz  how about this one??? 


it tells its a range rover..  can u tell me how this works??


(confused) (.") is this a obstacle avoiding or a light chaser?? or both? whew

It's very similar to the first circuit you posted. It chases the light and backs up when it detects an object via the 40kHz IR detector.

You don't need this level of complexity.

You just need a simple circuit that drives two motors forward until an obstacle is detected, then takes some sort of evasive motion, like reversing a motor before driving forward again.

Maybe, find a simple circuit that uses bump switches, and replace the bump switches with IR detectors if that is what you need.

How long have you got before your deadline?

hmmm. til 1st week of march sir,, sir do you have any IM??



how about this 1? ill change the bump switch into this comparator? can u help me?



That is more like what you want.

What sort of motors do you have? Have you got any components yet? We may be able to make something with parts you have already.

Is this for a small robot, like one that will run around on a tabletop, or must it be able to go on the floor, cope with carpets or whatever?

Please give me some idea of what you have in mind.

Also, what knowledge of electronics do you have? I don't want to explain things that you already know.

I do not have a lot of time, but I am happy to help you if and when I can.

And, please don't call me sir. :-)

i will be using the twin gear motor which u can buy in tamiya..




im thinking if i can use this circuit as a sensors.. see the link


Been very busy with work and stuff. I will post a part schematic later today.

Apologies for the delay. As soon as I said I would help all these tasks raised their ugly heads, and apparently I'm the only person in the universe who can deal with them! (No pay rise, though ... )

 This is just a simple sensor arrangement which will cause the motor to which it is attached to reverse for a certain amount of time. This time is set by R3 and C1.

 R1 feeds D1 which is an IR LED. You may wish to lower the value of R1 to increase the range. These are, obviously, used to trigger Q1, the phototransistor, when IR light hits an obstacle.

The phototransistor will have to be shielded from ambient, and stray IR, light. Under the corner of the 'bot sounds good.

Set potentionmeter, P1, so that the output of U1, the LM393, is high. Adjust the pot until the output goes low, then readjust until it just goes high again.

When an obstacle is detected the voltage at the junction of Q1 and R2 will decrease. When it falls below the voltage at the inverting input of the LM393 (pin 2), the output will go low, and reverse the motor. When the output goes low it will charge C1. The motor will continue to reverse until  C1 discharges.


Maybe breadboard the circuit and see how it goes for you.

You may, of course, want to use a 38kHz detector, but that would be a bit more work.

Any questions, please ask. Should I be a bit tardy with answers, others here may help.

If anyone has any improvements to offer, please feel free to have at it!


thanks a lot.. you're a big help..

dude,,, i suggest this schematic than the 1st 1