It's maybe easiest just to check which is larger
and then do the appropriate subtraction...
It looks like what you are getting is a "negative"
16bit int (where the top bit is set because the
subtraction "wrapped-around") converted into a
positive float.
You might also check the MPS manual to see if you
can set up an ADC with differential input. I think
the ATMEGA has options for this.
MS
manu suryavansh wrote:
Hi,
I am using tmote sky and want to measure differential voltage so I am
connecting V+ and V- to ADC1 and ADC2 on the tmote sky and then I am
taking the difference between the two adc values but I am getting values
like 65416.0 for the difference so I wanted to know is there any
function which gives the absolute value of the difference (modulus of
the difference) . I think this is the problem.
Is this correct?
Thank you
Manu Suryavansh
University of Florida
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