mMPXV7002DP Airspeed measurement

[nadi_abumahfouz]

Hello,

I'm using mMPXV7002DP and I'm trying to convert the output to measure airspeed. knowing the output pin connected to ADC with 3.3V refrence. how can I convert the output value to measure airspeed? 

Thanks,

Nadi

[TomasVaverka · Accepted solution]

Hello Nadi,

First off, have a look at Dynamic pressure - Wikipedia.

Dynamic pressure = 0.5 x density x velocity x velocity
You can use 1.225kg/m3 for sea level air density. Velocity should be m/s. Pressure will be in Pascals.

Then you need to know how many Pascals correspond to 1 ADC count. 

For example, if you have an 8-bit ADC with a 3.3V reference and considering typical sensitivity of 1V/kPa , then 1 ADC count corresponds to 12.89Pa.

Hope it helps.

Best regards,

Tomas

[nadi_abumahfouz]

Thank you Tomas, this is really helpful I understand everything right now.

Thanks,

Nadi