Building 2 Axis inclinometer

Discussion in 'The Projects Forum' started by Rahul Shah, Feb 12, 2016.

  1. Rahul Shah

    Thread Starter New Member

    Nov 4, 2014
    Hi All,
    I am in process of building 2-Axis Inclinometer. Ideally a 2 or 3 axis mems accelerometer along with a mems gyroscope should solve the problem. There are 6 axis solutions available from ST, Invensense and others with digital interface to host controller. All costing nearly about 5-6 USD max. In their application they do not mention that this can be used as +/- 90 deg inclinometer. I need resolution up to 0.001 deg.

    Yet, I came across a product from Analog Devices - ADIS16201. This product claims that it can be used as +/- 90 deg inclinometer. This is also a 2 axis accelerometer but costing around 30 USD!!!! I compared the specs and almost all are same.

    Why is this price difference? What should I go for? A cheaper solution or a costlier solution like Analog Devices?

    Thank you,
    Rahul Shah
  2. Sensacell

    Senior Member

    Jun 19, 2012
    Devil is in the details- remember that specs are written by MARKETING PEOPLE to sell parts!
    You really have to dig-in and study the parts in detail to see how things add up.

    "Show me a simple answer and I'll show you a poorly considered question"
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    From the ADIS16201 datasheet:

    Even at $30 it doesn't come close to what I think you mean by "resolution." That is, the LSB has some meaning. 0.001° resolution for 90° will require 2^17 "resolution."

    Of course, if all you want is resolution, not accuracy or precision, then that is a different story.