MMA7455L Three Axis Digital Output Accelerometer

By on February 9, 2012
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This module integrates the sensor MMA7455L (produced by Freescale), able to detect the movement on three axes, and then in every direction. The chip offers the possibility to select three different sensitivity (± 2g, ± 4g, ± 8g) and makes available, on an SPI bus and the I ² C-Bus, the data detected by allowing a more easily read by a microcontroller. There are also two programmable interrupt lines to communicate a certain event, or to perform one or more actions when it detects a certain acceleration or when the module is stopped.

The accelerometer connections are carried out on a male strip pitch 2.54 mm, seven contacts, which allows the insertion in any dip socket, female strip or directly on the printed circuit. The module, powered with a DC voltage of 2.5 to 3.6 V, is suitable for be used in all systems that require the detection of movement, acceleration, such as an alarm systems for vehicle, laboratory analytical instruments, electrical equipment, machinery test and robots.

The module has extremely compact dimensions (10x18x3, 6mm).

Before using this module is necessary to establish (through jumper J1) which must be the voltage applied to pin VIO (Digital Power for I/O pads), levels of the I / O interface must be the same of micro. If the voltage applied between the pin + and – of the module is the same as the interface device is necessary to close J1, while if it is different (for example because the micro operates at 5V) the jumper must be open and the line VIO must be connects to the same supply voltage of the microcontroller. The I ² C-Bus module is assigned to 00111011. For more information on the chip MMA7455L consult the datasheet from the Internet site www.freescale.com.

To show the operation of the module I made a little demo with Arduino.







The connection to the microcontroller is very simple and the pin-out allows you to insert the module in the 6-pin for the analog inputs.
The low absorption permit to use the input pin A0 as level of communicationis (VIO) brought it to a high logic level (5V), while the pin A1 is set to 0, the mass for the MMA7455L.
The main supply voltage is provide from 3.3 V by Arduino.

Thanks to the library Wire.h pin A4 and A5 are used to communicate directly with the module.
The communication is very simple thank the library MMA_7455.h developed by Moritz Kemper.

 

The software written in Processing By IAN allows you to immediately verify the correct operation of Freescale chip. A cube will rotate like the movements of the sensor.
The applications of this sensor are different and I will show you just developed.







About Boris Landoni

Boris Landoni is the technical manager of Open-Electronics.org. Skilled in the GSM field, embraces the Open Source philosophy and its projects are available to the community.

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17 Comments on "MMA7455L Three Axis Digital Output Accelerometer"

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[…] Three Axis Digital Output Accelerometer – [Link] Tags: accelerometer, I2C, MMA7455L, SPI Filed in Sensor | 7 views No Comments […]

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[…] Landoni] put together a guide to using an inexpensive 3-axis accelerometer with Arduino. The chip that he chose for the exercise is an MMA7455L made by Freescale. It’s got a lot of […]

David Kavanagh
Guest

Is this breakout board available somewhere? Seems like a nice compact form factor. I’m interested in perhaps a few of them.

Joe Thompson
Guest

Confused about power sources – why can i apply 5v to pin 1 on the MMA7455 when the datasheet says a maximum allowable voltage is 3.6v? if i’m running my atmega at 5v, am i supposed to have 5v on pin 1, and 3.3v on pin 6 with the jumper open?
why does the picture on the arduino MMA7455 library website show only the 3.3v source being used?
Thanks

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[…] LINK do strony projektu […]

Jonius Christian Harefa
Guest
Jonius Christian Harefa

Hi,
do you have a tutorial about accelerometer mma7361+arduino?

thanks

BorisLandoni
Guest

Hi, we are working on a new GPS shield with an accelerometer MMA7361 ;-)

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rahul
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Dear Sir, I am getting an error : error “MMA_7455.h: No such file or directory”. I tried reinstalling the library PROPERLY. kindly help.

BorisLandoni
Guest

Chekc the folder and the folder name

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You should check this out

I saw this really great post today.

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