Make: Sensors by Tero Karvinen Kimmo Karvinen and Ville Valtokari

Author:Tero Karvinen, Kimmo Karvinen, and Ville Valtokari
Language: eng
Format: mobi, pdf
Tags: TECHNOLOGY & ENGINEERING / Sensors
ISBN: 9781449368050
Publisher: Maker Media, Inc
Published: 2014-05-05T16:00:00+00:00

Gyroscope

Angular velocity

Change of angle, spinning

rad/s (SI), often deg/s or RPM

Ignores gravity

Experiment: Accelerate with MX2125

MX2125 is a simple two-axis acceleration sensor (see Figure 8-1). It reports acceleration as a pulse length, making the interface and code simple.

The real, physical world is three dimensional. Objects can go up and down (y), left and right (x), and back and forth (z). A two-axis sensor only measures two of these axes.

The MX2125 only measures up to 3 g per axis. But some sensors can measure extreme acceleration. For example, the maximum measured acceleration of the ADXL377 (200 g), is much more than would kill any human. Thus, it’s more than is experienced in a shuttle launch or high-g maneuvers in fighter jets. It could measure an object accelerating faster than a bullet fired from a pistol. When we made an early prototype for an Aalto-1 satellite sun sensor, even the satellite spec did not require acceleration this tough.

It’s unlikely that you would need to measure such an extreme acceleration, and it would probably not be possible with a breadboard setup (because the acceleration needed to test would shake your project apart!). The cost is quite minimal, though. However, the wider the area of measured acceleration (from -250 g to +250 g), the less precise the device is.

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