I am preparing the code to make the conversion of the raw RSSI value
available in received message (indirectly a reading from ADC INPUT 0 - RSSI
MONITOR). Although, I am developing using T1 (TinyOS 1.x), I read the T2 doc
http://docs.tinyos.net/index.php/Rssi_Demo and noted the same thing I
You may get a more informed opinion, but my belief is that the
raw RSSI reading should track the battery voltage because both
the source and ADC reference are relative to the battery. This
would not be the case if the ADCref was regulated, but it's not.
So baring any non-linearities you shouldn't
A little asideyou CAN measure the REAL battery voltage on
the micas because they have a fixed voltage connected to
the battery measurement ADC input (at least the mica2 does,
I'm forgetting if the Z is the same now...). It's counter-
intuitive, but when you convert the fixed ref it's apparent
Michael,
I understood your position. It really doesn't make sense to take the battery
level reading for each RSSI related to each received packet.
That's why, in my program, I will send this battery level value only if
happened a level drop (battery) based on a threshold.
Considering your idea, I
No you don't understand my position. You will have to check
the radio chip specs to verify if the raw RSSI ouptut is
independent of supply voltage or not. I suspect the not part,
and thus made the assertion that you don't need to make
adjustments to the readings as the battery droops.
You could
