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Why is MPX5500DP is giving a reading at the top of the range (78 PSI) when no pressure is applied.

Question asked by Marc Cote on May 22, 2015
Latest reply on May 25, 2015 by Jose Alberto Reyes Morales

I try to connect an MPX5500DP to an Arduino Mega but it keeps giving me a reading of about 78PSI which correspond to around 5V even nothing is connected to the ports. I was expecting to get something close to 0 in that case. In don't really care about the noise so the sensor is directly connected the Arduino (1 Vout, 2 GRD, 3 Vcc) and do not use capacitors. I use sample sensors. I tried with 2 different sensors with the same result. Can they be damage on arrival? What can cause such behaviour to the sensors?