I am trying to use a pressure sensor which is MPX2100DP. Datasheet is; https://www.nxp.com/docs/en/data-sheet/MPX2100.pdf
My goal is to measure the air pressure inside a pipe. First of all, I tried it alone. 1st = GND, 2nd = A1, 3rd = +12V. (I connected GND to power supply and arduino.) Whether I close the pipe or not, the result is 1023.. Also, I tried plug the hose into the other port. There arent any difference. Then, I tried to use a differential amplifier to compare the normal air with the air in the pipe and increase the value, but the values reflected unchanged at the opamp output. I used the instrumentation amplifier AD620AN, thinking that it is lost because of the low signal, but I still could not get any results. Where is my fault? Someone could advice me? I will convert voltage to pressure but firstly ı want to solve the problem of value.
Arduino code is ;
Serial.begin(9600);
}
void loop() {
float sensorValue = analogRead(A1);
Serial.print("A/D is: ");
Serial.println(sensorValue);
delay(750);
}