mpxv7025 sensor

[roshank]

Can i use mpxv7025 dp pressure sensor with arduino board? 

[TomasVaverka]

Hi Roshan,

Yes, it should be easy to connect this sensor to Arduino boards.

It is a 5V, temperature compensated and calibrated differential pressure sensor for ±25kPa. The offset is 2.5V and the output is 90mV per kPa.

The pins are numbered as follows:

So connect Arduino 5V to sensor pin 2. Arduino GND to sensor pin 3. Arduino analog input (for example A0) to sensor pin 4.

Read the analog value and write it to the serial monitor: http://arduino.cc/en/Tutorial/ReadAnalogVoltage

If that is working, you can start to calculate the actual pressure.

Hope it helps!

Best regards,

Tomas

[roshank]

Hi tomas,

 I am usinng following circuit. what is the range of ideal ADC

values from pressure sensor.

[TomasVaverka]

Hi Roshan,

First off, the operating supply voltage is from 4.75V to 5.25V. 3.3V is out of the recommended range. 

With no pressure applied (no pressure difference between P1 and P2), the output voltage should be around 2.5V. Then try to force some air into P1, e.g. using your mouth and see if the voltage goes up.

Best regards,

Tomas

[roshank]

Hi tomas,

        Thanks for reply. what is the range of ideal ADC values for inhalation and exhalation for this sensor.

Regards,

Roshan

[roshank]

Hi tomas,

          I also want to know that when we using this sensor for spirometric project, Is it better to use the sensor directly or with a reference circuit as shown above. which method gives more accuracy.

Regards,

Roshan