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Topic: Differential pressure sensor (Read 1 time) previous topic - next topic

kevindomadia

Hey guyz!,
I am using a differential pressure sensor(SX100DN) from honeywell...http://www.digchip.com/datasheets/parts/datasheet/1749/SX100DN.php.... its output voltage is 100-150mV...i wanted to connect it to the analog input of duemelinove.... Is it necessary to use an amplifier or is there any alternate method?....

johnwasser

You can use the internal 1.1V analog reference and measure 1024 steps between 0 mV and 1100 mV.

If you need finer resolution you will need an amplifier.
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kevindomadia

thanks!...how do i do it?...i am new to arduino!!

retrolefty


You can use the internal 1.1V analog reference and measure 1024 steps between 0 mV and 1100 mV.

If you need finer resolution you will need an amplifier.


Even using that lowest 1.1vdc reference voltage, one would still only get 10% of the measurement range of the analog input pin (so 100 'counts' of measurement range). I suspect you would be very dissapointed at the resulting resolution and noise variation that would result of using that method.

This kind of basic sensor is really designed to use with an input Wheatstone bridge compatible op-amp to increase the measurement output voltage to something more useful.

Lefty

kevindomadia

can you please suggest any opamp... as in the model no. or something?!

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