Ashley Mills / MMA8452

Library for driving the MMA8452 accelerometer over I2C

Dependents:   MMA8452_Test MMA8452_Demo Dualing_Tanks IMU-Controlled_MP3_Player ... more

Here is a simple example:

#include "mbed.h"
#include "MMA8452.h"

int main() {
   Serial pc(USBTX,USBRX);
   pc.baud(115200);
   double x = 0, y = 0, z = 0;

   MMA8452 acc(p28, p27, 40000);
   acc.setBitDepth(MMA8452::BIT_DEPTH_12);
   acc.setDynamicRange(MMA8452::DYNAMIC_RANGE_4G);
   acc.setDataRate(MMA8452::RATE_100);
   
   while(1) {
      if(!acc.isXYZReady()) {
         wait(0.01);
         continue;
      }
      acc.readXYZGravity(&x,&y,&z);
      pc.printf("Gravities: %lf %lf %lf\r\n",x,y,z);
   }
}

An easy way to test that this actually works is to run the loop above and hold the MMA8452 parallel to the ground along the respective axis (and upsidedown in each axis). You will see 1G on the respective axis and 0G on the others.

Files at this revision

API Documentation at this revision

Revision 14:0602b45ca70f, committed 2014-03-05

Comitter:
ashleymills
Date:
Wed Mar 05 15:09:21 2014 +0000
Parent:
13:4bd8b4cd479d
Child:
15:7620a11149b8
Commit message:
Updated author priority to reflect work

Changed in this revision

MMA8452.cpp Show annotated file Show diff for this revision Revisions of this file
MMA8452.h Show annotated file Show diff for this revision Revisions of this file 
--- a/MMA8452.cpp	Wed Mar 05 15:04:13 2014 +0000
+++ b/MMA8452.cpp	Wed Mar 05 15:09:21 2014 +0000
@@ -1,4 +1,4 @@
-// Author: Nicholas Herriot, Ashley Mills
+// Authors: Ashley Mills, Nicholas Herriot
 /* Copyright (c) 2013 Vodafone, MIT License
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software

--- a/MMA8452.h	Wed Mar 05 15:04:13 2014 +0000
+++ b/MMA8452.h	Wed Mar 05 15:09:21 2014 +0000
@@ -1,4 +1,4 @@
-// Author: Nicholas Herriot, Ashley Mills
+// Authors: Ashley Mills, Nicholas Herriot
 /* Copyright (c) 2013 Vodafone, MIT License
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software