Digital Voice over IR using picaxe 08m

[madspof]

Hi all i was wondering if it is possible to send voice from a microphone connected to a a picaxe 08m and then convert this to digital and then transmit and decode on another picaxe 08m chip? and would the sounds be audible?

thanks before hand madspof

 

[BeanieBots]

In short. No.
The PICAXE is simply not fast enough to sample audio digitally and then reproduce it.

You might be able to get up to a few kHz but the quality would be dreadful at such a low bandwidth.

 

[madspof]

Would any of the other chips do it? i am thinking of a school project at the moment and have had quite a bit of experience with picaxe chips do you have any ideas of a project involving sending data over IR?

 

[hippy]

You can buy IR headphone links. I've heard variable reports on quality but it is possible. Not sure what they use, maybe a bit of research on your favourite search engine is in order ?

 

[madspof]

hmmmm i dunno, i dont really have a favourite search engine at the mo X) but its the doing it by picaxe and creating a project which is needed for my a level. Im now thinking of using a lcd screen and key board and creating a wireless message board not sure if i could get that to work

 

[boriz]

This is one of those projects that would be more suitable to discrete component design. You could prolly use a raw PIC programmed in machine code. But I’m guessing that’s not your bag.

Simplest method is direct amplitude modulation, something like this:

http://simple-circuit.blogspot.com/2009/07/simple-ir-audio-transmitter-circuit.html

Some other circuits:

http://www.electronic-circuits-diagrams.com/audioimages/audiockt3.shtm

http://forum.allaboutcircuits.com/showthread.php?t=3483

http://www.electronicsforu.com/EFYLinux/circuit/January2007/CI-01_Jan07.pdf

 

[manuka]

A "wireless message board" certainly could be PICAXEable, but the overall cost with (say) an 18X/LCD/IR or 433 MHz TX/RX etc may well hit US$50 each end. Given Bluetooth mobile phones will do this already to ~10 metres, just what range did you have in mind? Budget? Time? Resources? Skills?

 

[Rickharris]

If keen to communicate using Picaxe read up on Manuka's posts on Hellschriber.

 

[MFB]

Optical coms handbook

I keep plugging the following free to download book when ever anyone wants information on how to send audio or data over an optical over-air link. It provides schematics and many other practicle details.

http://www.imagineeringezine.com/files/air-bk2.html