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Grove - 3-Axis Digital Accelerometer(±1.5g)

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3 aix acc

Contents

Introduction

3-Axis Digital Accelerometer is the key part in projects like orientation detection, gesture detection and Motion detection. This 3-Asix Digital Accelerometer(±1.5g) is based on Freescale's low power consumption module, MMA7660FC. It features up to 10,000g high shock surviability and configurable Samples per Second rate. For generous applications that don't require too large measurement range, this is a great choice because it's durable, energy saving and cost-efficient.
Model:SEN21853P


Specifications

  • Working voltage: 3.0 - 5.5V
  • Off Mode Current: 0.4μA
  • Standby Mode Current: 2μA
  • Active Mode Current: 47 μA at 1 ODR
  • Test Range: ±1.5g
  • Sensitivity: 21LSB/g
  • Suli-compatible Library


Note: More details about Suli-compatible Library, please refer to Suli


Demonstration

Here we are going to show you how to get raw data and data measured by "g" from this sensor. 

Connect this module to the I2C port of Grove - Base Shield via a Grove cable.

Note:If you want to activate the Interrupt function of this module, you need to connect the INT soldering pad we broke out on the board with a pin of Arduino that's capable of Interrupt Service Routine. 

Digital Accelerometer Sensor Connector1.5g.jpg

Install the library we provide in the "Resources" section.

Open the code directly by the path:File -> Example ->DigitalAccelerometer_MMA7660FC ->MMA7660FC_Demo.

In this program, acceleration infomation are sent from the sensor to Seeeduino via I2C bus and then Seeeduino printed them onto the serial monitor.
Open the serial monitor to check the result.


3 aix acc resutl

The outputs of this sensor consist of two parts: raw data and 3-axis acceleration info converted into the unit of gravity, "g".

Reference

Below are two figures helping you understand the physical meaning of the result.

The first figure is about the direction of each axis:
MMA7660 Direction.jpg

The second figure gives some examples:


Sensing Direction 1.jpg

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