In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

[QUOTE="dbj"]
Would it be ok to use the SX28 and enable the sleep mode and have the alarm event wake up the SX and then enable the transmitter by pulling the power down pin high, then send sync pulse followed by a loop containing the identifier data string that tells the BS2 which transmitter is active so that it can activate the proper alarm input on the sensaphone?[/QUOTE]
This sounds like a good plan to me!

[QUOTE="dbj"]Also should there be a reset based on time so that the alarm if triggered it will reset its self and return to sleep mode. [/QUOTE]
You could do that to save battery power.  Whatever state change triggers your alarm, say High-to-Low, just finish transmitting then go to sleep and wait for the opposite condition to occur.  This will indicate that the alarm condition has been cleared.  So just have the SX go back to sleep yet again, this time waiting for another High-to-Low event signaling a new alarm condition.

[QUOTE="dbj"]Also should the internal clock be used or a external oscillator? [/QUOTE]
Definitely go with an external oscillator or resonator.  You will want stable timing for sending serial data over the temperature range your construction site will see.

I hope this helps.

- Sparks

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