Today we looked at XBee modules. XBee, in case it wasn't mentioned in earlier posts, is MaxStream's implementation of a ZigBee radio. We decided on the XB24-BWIT-004-ND, which is an XBee Series 2 radio with a wire antenna. It costs $21. (XBee Series 2 implements ZigBee mesh, whereas Series 1 is apparently meant for other applications.)
As for microcontrollers: we wanted an 8051 with an integrated ADC and DAC, given our past difficulties with ADCs. Atmel has an 8051 variant with an ADC, DAC, and MP3 decoder, which sounds quite handy; unfortunately, they are BGA packaged. There are also no DIP 8051s with ADCs built in. In all likelihood we will probably have to do something like this.
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