Add accelerometer only example

Author: sandeepmistry

libraries/CurieImu/examples/Accelerometer/Accelerometer.ino

@@ -0,0 +1,94 @@
+/*
+  ===============================================
+  Example sketch for CurieIMU library for Intel(R) Curie(TM) devices.
+  Copyright (c) 2015 Intel Corporation.  All rights reserved.
+
+  Based on I2C device class (I2Cdev) demonstration Arduino sketch for MPU6050
+  class by Jeff Rowberg: https://github.com/jrowberg/i2cdevlib
+
+  ===============================================
+  I2Cdev device library code is placed under the MIT license
+  Copyright (c) 2011 Jeff Rowberg
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+  ===============================================
+*/
+
+#include "CurieImu.h"
+
+void setup() {
+  Serial.begin(9600); // initialize Serial communication
+  while (!Serial);    // wait for the serial port to open
+
+  // initialize device
+  Serial.println("Initializing IMU device...");
+  CurieIMU.begin();
+
+  // Set the accelerometer range to 2G
+  CurieIMU.setAccelerometerRange(CURIE_IMU_ACCELEROMETER_RANGE_2G);
+
+  Serial.println("About to calibrate accelerometer. Make sure your board is stable and upright");
+  delay(5000);
+
+  // start accelerometer
+  Serial.print("Starting accelerometer calibration...");
+  CurieIMU.autoCalibrateAccelerometerOffset(X_AXIS, 0);
+  CurieIMU.autoCalibrateAccelerometerOffset(Y_AXIS, 0);
+  CurieIMU.autoCalibrateAccelerometerOffset(Z_AXIS, 1);
+  Serial.println(" Done");
+
+  Serial.println("Enabling accelerometer offset compensation");
+  CurieIMU.enableAccelerometerOffset(true);
+}
+
+void loop() {
+  short int axRaw, ayRaw, azRaw;         // raw accelerometer values
+  float ax, ay, az;
+
+  // read raw accelerometer measurements from device
+  CurieIMU.readAccelerometer(axRaw, ayRaw, azRaw);
+
+  // convert the raw accelerometer data to G's
+  ax = convertRawAcceleration(axRaw);
+  ay = convertRawAcceleration(ayRaw);
+  az = convertRawAcceleration(azRaw);
+
+  // display tab-separated accelerometer x/y/z values
+  Serial.print("a:\t");
+  Serial.print(ax);
+  Serial.print("\t");
+  Serial.print(ay);
+  Serial.print("\t");
+  Serial.print(az);
+  Serial.println();
+
+  // wait 5 seconds
+  delay(5000);
+}
+
+float convertRawAcceleration(short aRaw) {
+  // since we are using 2G range
+  // -2g maps to a raw value of -32768
+  // +2g maps to a raw value of 32767
+  
+  float a = (aRaw * 2.0) / 32768.0;
+
+  return a;
+}
+