Sensors中的主题 MPX5100DP resolution

MPX5100DP resolution

petepauline — Tue, 03 Feb 2026 21:08:35 GMT

Hey There! I have a question about the MPX5100DP and it's resolution. I'm having some trouble (embarrassingly) understanding 45mV/kPa. I'm hoping to observe changes is air pressure in the .01kPA range with an arduino.

Is this possible? If not is there another sensor that would be a more appropriate choice?

Thanks so much! Pete

Re: MPX5100DP resolution

TomasVaverka — Tue, 12 May 2015 13:33:19 GMT

Hi Pete,

With a 10-bit ADC that is typically used on the Arduino boards, you can only get 1024 voltage readings between 0 and 5V, giving a difference of 4.88mV between readings. Considering sensitivity of 45mV/kPa, the resolution is about 108Pa.

We do have some more sensitive differential/gauge pressure sensors, but I need more information on your application to recommend the most suitable device.

Regards,

Tomas

PS: If my answer solves your question, please mark it as "Correct" or “Helpful”. Thank you.

Re: MPX5100DP resolution

petepauline — Thu, 14 May 2015 18:26:20 GMT

Hey Tomas!!

Thanks so much for the clarification!

I was hoping to use a bunch of Arduinos (5v) to sense the delta in pressure between rooms. I was looking to get near the : 0.1 in. H2O or 2.5 Pascals range. Is there a freescale product that would allow me to sense this?

Thanks Tomas!!

Pete :smileyhappy: