So many accelerometers and so little time! Adafruit have expanded Adafruit's accelerometer selection even more with this high-precision and inexpensive MMA8451 Triple-Axis Accelerometer w/ 14-bit ADC. You can detect motion, tilt and basic orientation with a digital accelerometer - and the MMA8451 is a great accelerometer to start with. It has a wide usage range, from +-2g up to +-8g yet is easy to use with Arduino or another microcontroller
The MMA8451 is a miniature little accelerometer from Freescale, who are (by this point) masters at the accelerometer-design game. It's designed for use in phones, tablets, smart watches, and more, but works just as well in your Arduino project. Of the MMA8451/MMA8452/MMA8453 family, the MMA8451 is the most precise with a built in 14-bit ADC. The accelerometer also has built in tilt/orientation detection so it can tell you whether your project is being held in landscape or portrait mode, and whether it is tilted forward or back
This sensor communicates over I2C so you can share it with a bunch of other sensors on the same two I2C pins. There's an address selection pin so you can have accelerometers share an I2C bus. Please note this chip requires repeated-start I2C support (in case you are looking to port this to another processor)
To get you going fast, Adafruit spun up a breakout board for this little guy. Since it's a 3V sensor, Adafruit add a low-dropout 3.3V regulator and level shifting circuitry on board. That means its perfectly safe for use with 3V or 5V power and logic. It's fully assembled and tested. Comes with 8-pin 0.1" standard header in case you want to use it with a breadboard or perfboard. Two 2.5mm (0.1") mounting holes for easy attachment.
- Dimensions: 21mm x 18mm x 2mm / 0.83" x 0.71" x .08"
- Weight: 1.3g
- Uses I2C repeated-start, address is selectable to either 0x1C or 0x1D
- Datasheets, PCB files, Fritzing object available in the tutorial
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Documentation and Resources:
- The Maker Revolution
The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...
- Getting Hands-on with Sensors
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- Automatic Bike Indicators
This project uses an Accelerometer to detect when you are leaning left or right. Depending on if/where you are leaning, it will flash LEDs on the right or left of the bike's rear. Powered by an Arduino and a 12v battery pack (my case 8 AA Batteries). I have made a video on it below. Here is the code you'll need to build your own....
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