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 18:27d839e6dc0e, committed 2014-03-05

Comitter:
ashleymills
Date:
Wed Mar 05 17:04:04 2014 +0000
Parent:
17:6e4232c421c0
Child:
19:4d6cd7140a71
Commit message:
Debugging enabled by default for convenience

Changed in this revision

MMA8452.h Show annotated file Show diff for this revision Revisions of this file 
--- a/MMA8452.h	Wed Mar 05 17:01:00 2014 +0000
+++ b/MMA8452.h	Wed Mar 05 17:04:04 2014 +0000
@@ -24,6 +24,8 @@
  
 #include "mbed.h" 
 
+#define MMA8452_DEBUG 1
+
 // More info on MCU Master address can be found on section 5.10.1 of http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA8452Q
 #define SA0 1
 #if SA0