MPL3115A2 Sensor Altitude Accuracy problem

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MPL3115A2 Sensor Altitude Accuracy problem

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kayathrim
Contributor I

Hi all,

 

I am testing MPL3115A2 sensor to measure altitude. I can able to read the altitude value. I have monitored the altitude over 24 hours in a same place, height varies from 0 to 50 meter. How to calibrate the accuracy . Altitude keep on varying . I have attached log for reference.

 

Regards,

Kayathri

Original Attachment has been moved to: Altitude_sensor.zip

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王琳娜王
Contributor I

您好 请问这个问题最后是如何处理的呢? 我现在遇到一个跟您一样的问题

我也是用MPL3115A2芯片直接从芯片内寄存器中读取海拔值,在一天当中同一地点的不同时间芯片出的海拔不同

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markpedley
NXP Employee
NXP Employee

The MPL3115 is a pressure sensor which converts pressure to altitude using a standard atmospheric model. With a "back of the envelope" calculation, 1 atmosphere is about 10,000m so a 50m change is just 0.5% change. You're probably just seeing atmospheric pressure changes.

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kayathrim
Contributor I

Hi Mark Pedley,

Thank you for your response.

If 50 meters change is due to atmospheric changes then how do we bring accuracy in altitude calculation.

Regards,

Kayathri

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