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MMA8453 Accelerometer Library

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An arduino library for the MMA8453 Triple Axis Accelerometer

The MMA8453Q is a cute little surface-mount triple-axis accelerometer chip from Freescale Semiconductor . It communicates over the I2C protocol so it is easy to interface with many microcontrollers especially Arduinos! Here we have an Arduino library, which abstracts away many of the nasty details of talking to the chip. It just gives you the values you want, namely the X, Y and Z accelerations.We use these bad boys all the time for eample in our Wearable Wayfinder , Leo Gamer and HID3D projects. The example code prints these values out on the serial port. You can use accelerometers as a tilt sensors.

Images

The MMA8453Q From Freescale Semiconductor

The MMA8453Q From Freescale Semiconductor

The accelerometer chip!
MMA8453 Accelerometer on I2C Bus Electrical Schematic

Schematic showing how to hook the accelerometer up to a I2C bus. Remember these guys operate at 3v3 so you may have to use transistors to communicate with a 5v device.

The accelerometer chip!

Code

Arduino Code for The MMA8453 Accelerometer

Here is a little code snippet to spit the values of the MMA8453 Accelerometer out on the Serial port. Make sure to include the I2C library and the MMA8453 library in the sketch. You can download them both lower down on this page!

#include "I2C.h"#include "MMA8453Q.h"MMA8453Q accelerometer;

Now get accelerometer readings with the functions getX(), getY(), and getZ(), as in:

int x  = accelerometer.getX();

The values can be positive or negative and range from -512 to 512. See the entire example sketch below.

Download File

#include #include MMA8453Q accelerometer;void setup(){  Serial.begin(9600);} void loop(){  Serial.print("X:");  Serial.print(accelerometer.getX());  Serial.print(", Y:");  Serial.print(accelerometer.getY());  Serial.print(", Z:");  Serial.print(accelerometer.getZ());  Serial.println();  delay(300);}

Downloads

MMA8453Q Accelerometer Arduino Library

A clean and simple library for interfacing with the MMA8453Q chip built on top of Kerry Wong's post and ninjablocks work . We had to change the address to:

const byte I2C_ADDR = 0x1C; //SA0=0

previously it had been 0x1D. Download the MMA8453Q Accelerometer library from Github!

I2C Arduino Library

Similar to the wire library but more flexible. You may wonder why we cannot use the standard Arduino Wire library, it is because the MMA8453Q uses a repeated start condition for the read operations and the default Wire library cannot handle those without modification.

Click Here to Download: I2C Arduino Library

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