Getting started with sending radio/wireless payloads

[LesB]

First of all, the deal is, besides being an avid cyclist, I'm just a real geek.

With rim brakes on a bike, the bike is slowed by transferring the energy from forward motion into heat, which gets dumped into the aluminum rims.  On a technical descent like the one linked below, the rims can get in the vicinity of 200F.  Being the geek I am, I am interested in logging this heat and charting it in Excel. 

And now that you mention it, tire pressure is a definite point of interest.  Heat from the rim will transfer to the air inside the tire, and to the tire itself. The air will expand from the heat and the rubber in tire will be weakened.  This creates a situation where the tire can have a critical failure.  There have been serious crashes from cyclists having a tire failure during a fast descent.

So, yes now that you mention it, tire pressure will be a good addition, which I will add after I  have the system operating with temperature logging.

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Now for my next question regarding RF: 
Since I will have 2 nodes sending from separate locations, I plan on having two gateway Moteinos on the handlebar, one to receive from each of the nodes. 

Question is, is it possible to have just one gateway Moteino and have each of the nodes respond only when requested by the gateway?

[TomWS]

<...snip>
Now for my next question regarding RF: 
Since I will have 2 nodes sending from separate locations, I plan on having two gateway Moteinos on the handlebar, one to receive from each of the nodes. 

Question is, is it possible to have just one gateway Moteino and have each of the nodes respond only when requested by the gateway?

ABSOLUTELY!  One Moteino as a data collector and (presumably reporter to the rider) and a mote on each tire measuring and sending their data to the single collector is trivial.  The hard part is the interface design, the SW is a piece of cake. 

Basically, your bike (am I allowed to call your high tech machine that?) will have its own 'network' with three devices.  The central one on the handlebars isn't a 'gateway'.  It's simply another node in the network that the other two devices talk to.  As long as they 'know' the central mote's node id, they can each carry on their individual 'conversations' with it and the central mote 'knows' who it's talking to from the SENDERID...

Easy peasy   
Tom
AND I was right, a REALLLLLY cool project!