Let's Make Robots!

Free Range Robots (IR Beacon) **UPDATED**

**Update 4.14.09***

OK, when you watch the video... 

First of all, it is like, 5 minutes -sorry. There is a point though promise, and that point starts at about 3:40 or so. Now, I can't stress enough, the code is wicked chunky as it was written in about 10 min. It is all "bang-bang" and not proportional at all. The final code should be about 10x faster, much more accurate with a lot less trial and error. For now, this is just proof of concept and indeed it has been proven. 


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And you set up the RadioShack IR reciever with the same circuit shown in the manual? I must be doing something wrong ...

Most parts like the ir receivers have their own datasheets that show how you would set up their product. It's best to refer to that document vs the one that is shown in the picaxe manual as far as other supporting comments are concerned. You should only have to worry about the signal line in the end.

 This is one I worked on a while back that I included a connector(far back side)plus an led that showed I was getting a signal. no need to hook it up to a uProc to know that it worked. just a battery and a tv remote.

I used a pnp transisotor(top right) hooked up to the signal line to the led. This is a 38khz ir reciever btw bought from Mouser electronics. The one used here is the tsop4838


3-pin, 38khz IR receiver -as shown in the picaxe manual. --That's it

That is beyond awesome. This IR triangulation is a breakthrough.

Expect on having lots of imitators. LoraxVision!

Does Walter use the IR reciever that Rev Ed sells? I tried to locate a US distributer for that part and was told they are no longer in production ...

I found a bunch of Sharp GP1u5's at a local shop, but haven't been able to get it connected to my axe.


IR parts : World Educational Services says that the Rev Ed IR receiver part is a TSOP18xx. Try checking out that datasheet for compatibility to the Sharp GP1U5 parts you have, checking frequency, and also look over Panasonic PNA4602. I've used a couple Sharps, but prefer the Panasonic part as it seems more sensitive.

Maybe you could set your system up so that the receiver has more than one sensor. Only thing I see resembling this pre-built on the market is the Pololu tranceiver pair, but they're kinda expensive. But they do have a good idea there, those Pololu dudes.

 Anyway, cool project! I've always wanted to do that! 

I'm thinking if you want to have IR beacons every where then why not use a single picaxe in the ceiling, running of the mains power. By using an array a picaxe 14M can drive 20 LEDs. More with Charlieplexing. then in each room where you want a beacon you only need to drill a tiny 5mm hole (or even 3mm with 3mm LEDs) and poke the LED through.
When I was brainstorming an IR beacon for a charging station I would going to make it so it would fit in a wall outlet and have an adjuster so the LED was at the right height.
That's a good idea for a charging station.
That would work here too so you can avoid havign so many batteries hooked up around the house for beacons. You would have to change them out too often and if the beacon doesnt have a charge it would make the bot not know the room.