Air pressure sensor with 4 pins

#1

Hi! Electronics illiterate here. My MPX10DP came in from eBay today, and I want to make sure I know what I'm doing before I try to hook anything up.

Are pins 2 and 4 redundant? Since GPIO takes positive voltage, should I just use pin 2 and not 4?
Does this look right?
1. GND
2. PA0
3. VDDA
4. nothing

#2

I had a quick look on-line, it appears both pins 2 & 4 need to each be connected to a separate Analogue Input pin. The reading from both pins needs to be compared.

Extracted from the data sheet..
"The output voltage of the differential or gauge sensor
increases with increasing pressure applied to the pressure
side (P1) relative to the vacuum side (P2). Similarly, output
voltage increases as increasing vacuum is applied to the
vacuum side (P2) relative to the pressure side (P1)."

#3

Since I'm only measuring one sensor (the other will be open to the air), would it be ok if I only hooked up the corresponding pin?

#4

yes that should be fine...