Let's Make Robots!

OFR (Object Following Robot)

Follow an Infared beam around

I have been having this idea in my mind for awhile. Now I want to get it out and put it on the drawing board.

OFR is a robot that follows a specific infared siginal around and around where ever it goes!

I'll give updates on my progress


I have made an infared emmiter from some parts and it emmits a 38kHz. This will be what the robot will follow.





I have planned out the circut board that emmits a 38 kHz signal.




Also I have it designed in a PCB form.


The 7805 voltage regulator turn 9V to 5V enough for the chip to handle.

22k and the 10k varrible resistor helps the capacitor charge at different speeds.

The 74AC14 is an inverter chip.

th capacitor charges about 38,000 times per second and transfer it to the infared LED which generates a 38kHz signal


I'm waiting for my PICAXE kit to arrive.


in the meantime i'm having trouble solving how it's head is going to find, lock on, and follow the infared beam.

if anyone has an idea, feal free to tell me :)


Thanks to Chris the Carpenter, I decided to use the Pololu beacon transceiver.



I have recievied my PICAXE and instead of the pololu dual serial motor controller, I used the solarbotics L298 motor driver. I hooked it up to 2 motors and to the PICAXE. The PICAXE gives signals to the L298 motor driver and it drives themotors. Also indicating the direction through fashionable LEDs.=)ofr_00002.jpg


This is what I have so far.



I just finished the emmiter circut on a perf board.



Close uo of the components:


The Infared LED Looks great at 56kHz



I finally finished the robot after many program problems.




yes the body is a puzzle calender. I stumbled upon it and thought it was really good!



This is in the engine. The PICAXE is wired to the motor driver really badly. I couldn't find good connectors, usually the soder would break and the wire would come off.


That is the Pololu Infared Beacon sitting at the top of some lego sticks.


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that's very interesting! how did you make your calculations to know you would exactly get a 38 kHz signal?

Man,  I just love seeing neat, clean homemade boards --Great Job. Boy do I want to see this one work... well, I just want to steal the idea!

 -One thought, if the IR LED was put into a little tube where it could only shoot one direction -or- the IR sensor had "blinders" in the same fashon could this take care of any false or vauge readings? I'm just brainstorming.

www.rocketbrandcustom.com baby!!

Thanks, I'm still waiting for the sensor.

How about two IR phototransistors? There'd be a bit of a trick getting them to react only to 38KHz, but it could be done. Point the in slightly different directions and establish which is the strongest... 

Do you mean instead of using 38kHz sensors use IR phototransistors?

 How about an infared photodiode?

I issed the bit where you aid you had 38kHz sensors. Use 38kHz sensors if you have 'em    .
Nice! BaseOverApex - This is your sollution for the Big Chaser, no?
I'm thinking "yes."
You need a LOT more caps around the power supply (tantalum) to reduce false spikes. Make sure you use a mylar or silver mylar cap too.

Looks like a PP3. I can't see a need for caps on the input side of the regulator unless you're using the 9V to drive something else as well. You've already got some buffer juice and looks like a bit of decoupleing, too on the output.

Where would you stick extra caps? I ask because power supplies are alwasy causing havoc in my bots!!