[Tinyos-help] about the "PIR_THRESHOLD" value

[campbell gao]

hi ,
could i change the  "PIR_THRESHOLD" value for MSP410??

now i refer the detect program(in /opt/MoteWorks/apps/xmesh/XMSP410) to
write a experiment program.
but i find that in the sensorboardApp.h(the same folder) and detect.nc ,
there is a "PIR_THRESHOLD"  value .
This value is set to tell the mica processor : when the pir value is top of
"PIR_THRESHOLD"(?? or the difference between two samples is top of the
value??) , then the quad is detected ,right ??

and my question is how to change it or use it in my program ??( i need to
set the THRESHOLD in my program,too)

i search every folder (in /opt,especially the /tos folder) for this value,
but the result is none except in the sensorboardApp.h.
i try to change the value ,and use it like this in my .nc file :

# define PIR_THRESHOLD 150

but i am not exact sure whether this is right!?
and after the value change (from 736 in the sensorboardApp.h to 150 in my
program) , how will the result be changed??

best wishes

campbell
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