Merge pull request landlessness#3 from gradymorgan/master

Adding some features to library

README.md

@@ -1 +1,69 @@
+
 # node-BNO055
+
+## Installation
+
+Install i2c following instructions here:
+https://github.com/kelly/node-i2c
+
+```sh
+$ npm install --save bno-055
+```
+
+## Usage
+
+```js
+
+var BNO055 = require('bno-055');
+
+var async = require('async');
+
+var imu = new BNO055();
+
+imu.beginNDOF(function() {
+    console.info('imu running');
+
+    setInterval(function() {
+        async.series({
+            calibrationStatus: imu.getCalibrationStatus.bind(imu),
+            quaternion: imu.getQuaternion.bind(imu),
+            euler: imu.getEuler.bind(imu),
+            linearAcceleration: imu.getLinearAcceleration.bind(imu)
+        },
+        function(err, results) {
+            console.info( 'imu: ', JSON.stringify(results) );
+        });
+    }, 1000);
+});
+```
+
+Change the mounting position of the sensor. See section 3.4 Axis remap in the datasheet for details.
+
+```js
+var imu = new BNO055({
+        orientation: BNO055.orientation(BNO055.AXIS_REMAP_Y, BNO055.AXIS_REMAP_X, BNO055.AXIS_REMAP_Z, 0,1,0)
+    });
+```
+
+Resuse the sensor's calibration data.  See section 3.10 Calibration for details on manual calibration.
+
+```js
+// get calibration values, and save for later
+var calibrationData;
+
+imu.getCalibrationData(function(err, results) {
+    if (!err && results) {
+        calibrationData = results;
+    }
+});
+
+
+//then use that data later when initializing the sensor
+var imu = new BNO055({
+    calibration: calibrationData
+});
+```
+
+## Datasheet
+
+https://www.adafruit.com/datasheets/BST_BNO055_DS000_12.pdf