Hi,
Maybe have a look at the HopeRF rfm73 Radio modules. I'm currently playing with them and am quite impressed. The range isn't wonderful (ca. 10 meters through 2 concret walls) but the modules are:
1) Really cheap at 2.50Euro a Piece
2) SPI Interface
3) Include Auto acknowkledge/retry
4) Really small 16x13mm
5) There's a Bascom AN for an earlier model that almost works
6) 2.4GHz Radio frequwncy
7) Each Radio can have it's own ID so i's possible to create a one to many star Network (One Transmitter, many Receivers)
I'm currently transmitting a data packet to one of 16 Receivers every 300ms. Once I get the Software working 100% I'll create an AN (I'm corrently having Timing Problems with the initalisation).
Regards
Ian Dobson
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