[Tinyos-help] A very important question..Need opinions..

[John Griessen]

nisha jain wrote:
> Hi All,
> 
For example if we need to check the
> weather
> conditions for exapmle -- pressure and temp. Can sensors be equiped with
> single mote
> and sampled? I don't know how many A/D converters are present? If there are
> multiple can
> we use event handlers to collect the data?

Sure, that's what T2 is good for -- many sensors used at once without stomping on each other's code.

There are 8 A2D's available on telosb.  I've just tested a sensor board that muxes 6 of them and uses two A2D slots
as DAC instead to have 12 A2D's.  All on a telos add-on platform called ecosens1.  I'll be making motherboards
based on that soon too that do not add onto a telosb board, but give you a low cost expansion
connector for flat flex cable.  That lets you plug an add-on sensorboard with few mounting
and space constraints (flat flex cable), plus low cost.  When I make the ecosens1 MSP430F1611
motherboard from scratch, it will have two or three 20 conductor FFC connectors (they cost 0.25 each in volume)
so every imaginable add-on can be done.  For your temperature wants, I have a customer buying development of
Dallas one wire interface code in tinyOS that will let you use those thermometers -- almost as many as you want:
up to 50 per node.  And nice solar power supplies too.

John Griessen

-- 
Ecosensory   Austin TX
tinyOS devel on:  ubuntu Linux;   tinyOS v2.0.2;   telosb ecosens1