Could use some help wiring a MPX5050GP pressure sensor to arduino

Other Hardware Sensors
1

So I've ordered a Freescale MPX5050GP pressure sensor which supposedly can be connected to the arduino without any amplifier. I previously used a MPX12GP which did need an amplifier.

The datasheet for the MPX5050GP: here

Im trying to wire the sensor to the arduino, and the VCC, GND and Vout are pretty obvious i guess, I just am too inexperienced with datasheets to deduce how to connect the rest of the pins.. theres V1, V2 and Vex, but I am at a loss what to do with those..

I've googled for some wiring schematics or projects where people explain how to wire the sensor to the arduino but to no avail..

I hope one of you guys can help me out!
Thanks in advance.

Edit. I just found a similar sensor wiring schematic, which says to only wire the first 3 pins ( Vout, GND, VCC) basically.. But what are the other 3 for then? Calibration or something?

2

In the datasheet they write in capitals that the other pins are "NO CONNECTS". You may not connect those to anything!
Perhaps they are used during manufacturing or calibrating the sensor, I don't know.

3

Ok, so this topic is way old. But I have an MPX5050 and an arduino on my desk (6-sip format). I have an LCD readout of the pressure and an LED that lights up when it is over 26 psi.
The circuit is simple. Pin 1 (Vout) goes to an analog in (A0 for me). Pin 2 to ground. Pin 3 to Vcc (5 V). The other pins are just floating there, not connected to anything.

float voltage = (float) 5*sensorValue/1023 - .15; // voltage at Arduino pin. Range is 5V, 10 bits.

This isn't quite right, meaning it isn't calibrated, but it gives me a good reading. divide by 68.9476 for psi

I apologize for posting to such an old post, but I just ordered 10 more of these sensors for a hemodialysis test project and found this in my search.

4

Daz999:
float voltage = (float) 5*sensorValue/1023 - .15; // voltage at Arduino pin. Range is 5V, 10 bits.

Why float voltage. Are you making a voltmeter?

Just convert A/D value to pressure directly.
Assuming you want to display in psi, with two decimal places, try this sketch.
Leo..

const int offset = 41; // zero pressure calibrate
const int fullScale = 962; // max pressure calibrate
float pressure; // final pressure

void setup() {
  Serial.begin(9600);
}

void loop() {
  pressure = (analogRead(A0) - offset) * 7.25189 / (fullScale - offset); // 50kPa = 7.25189 psi
  Serial.print("Pressure is ");
  Serial.print(pressure);
  Serial.println(" psi");
  delay(500); // slow down for humans to read
}