> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Michael Watterson
> Sent: 10 May 2010 11:28
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Bluetooth control via iPhone
> 
> It would be easier to add IR dongle or 433MHz OOK/ASK (315or 915 in
> USA?) dongle. Simpler software too. The ASK/OOK dongle could even
> operate of headphone jack. On nearly any phone. 4KHz clock on one
audio
> channel as power and 2.4kHz manchester data on other audio channel.
> 
> The RF ASK/OOK can use about 1mW (lower power than Bluetooth) and can
be
> 90% efficient and TX and RX parts are under $1 each end. The case and
> connector maybe cost more than the ASK TX which is a SAW resonator, 1
> transistor, about 4 capacitors, 1 resistor and PCB foil filter/aerial.
> 
> 1200bps at better range than Bluetooth too! Current ASK receiver chips
> only need a single crystal and no external IF filter. The two coils
and
> aerial can be printed PCB track.  Built in AGC and Data slicer. Over
> 88dB dynamic range. You simply manchester encode the raw serial data.

That means extra hardware to be plugged into the phone though; I can
certainly see why a software only solution at this end would be greatly
preferable.

Mike

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