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language:cĪs in the example above, you can use if or switch statements to check which orientation your accelerometer is in.The 3-in-1 Smart Car and IOT Learning Kit from SunFounder has everything you need to learn how to master the Arduino. This function returns a byte, which will either be equal to PORTRAIT_U, PORTRAIT_D, LANDSCAPE_R, LANDSCAPE_L, or LOCKOUT. To read the portrait/landscape data from the accelerometer, use the readPL() function. The MMA8452Q has all sorts of nifty, extra features, one of which is orientation detection - it can estimate if it's being held in landscape mode, portrait mode, or flat. Make sure that happens before you start using acceleration values. Remember! Those variables are only updated after the read() function is called.

Serial.print('Acceleration on the z-axis is: ')

ZAcceleration = // Read in calculated z-axis acceleration These are the calculated acceleration values read out of the accelerometer they'll be in units of g's. Or, if you want a value with physical units, you can use the cx, cy, and cz class variables. Serial.print('Acceleration on the x-axis is ') XAcceleration = accel.x // Read in raw x-axis acceleration data Reading from the x, y, and z class variables will return a signed 12-bit integer read straight out of the accelerometer.

Wire.h library arduino download update#

language:cĪccel.read() // Update acceleromter dataĪfter you've called the read() function, you can use either of two sets of values to use the data. First, call the read() function to pull in the values. Reading and using the values is a two-step process. Once you've set the accelerometer up, you can immediately start reading the data coming out of the chip. Scale can be either SCALE_2G, SCALE_4G, or SCALE_8G. If you want to specify the acceleration and output data rate, you can instead use an init() function like this: language:cĪccel.init(, ) // Init and customize the FSR and ODR This will initialize the accelerometer with range of ☒g and an output data rate of 800 Hz (turns the accelerometer up to the max!): language:cĪccel.init() // Default init: +/-2g and 800Hz ODR You can use a simple declaration like below. The init() function verifies communication with the accelerometer, and sets up the full-scale range and output data rate.Īgain, you have a few options here. Initialize the MMA8452Q (Setup)įinally, in the setup() function of your sketch, you can initialize the accelerometer using the init() function. MMA8452Q accel(0x1D) // Initialize the MMA8452Q with an I2C address of 0x1D (SA0=1)īut if you've left the address jumper untouched (meaning the 'SA0' pin is connected to VCC), you can call the default (no parameter) constructor shown earlier. MMA8452Q accel(0x1C) // Initialize the MMA8452Q with an I2C address of 0x1C (SA0=0) Optionally, you can define the 7-bit I 2C address of your MMA8452Q in this parameter, using one of these lines of code: language:c MMA8452Q accel // Default MMA8452Q object create.

Wire.h library arduino download code#

This line of code will do it for you: language:c Once the library is included, you can create an MMA8452Q object. Make sure you include that before you include the SFE_MMA8452Q.h file. The library also requires that you include Wire.h in your sketch.

#include // Includes the SFE_MMA8452Q library #include // Must include Wire library for I2C To begin, you need to 'include' the library in your sketch: language:c Here are some tips on using the MMA8452Q Arduino library so you can embed it into an Arduino sketch of your own. Test the other axes by rotating the board and making them feel the pull of gravity. If it is motionless, flat on the desk, then an acceleration of 1g should be felt on the z-axis, while the others feel around 0. Try moving the sensor around to change those values.