first commit

Software/NodeJS/libs/sensors/accelerationI2cSensor.js

@@ -0,0 +1,29 @@
+var util       = require('util')
+var I2cSensor  = require('./base/i2cSensor')
+var commands   = require('../commands')
+
+function AccelerationI2cSensor() {
+  I2cSensor.apply(this, Array.prototype.slice.call(arguments))
+}
+AccelerationI2cSensor.prototype = new I2cSensor()
+
+AccelerationI2cSensor.prototype.read = function() {
+  var write = this.board.writeBytes(commands.acc_xyz.concat([commands.unused, commands.unused, commands.unused]))
+  if (write) {
+    this.board.wait(100)
+    this.board.readByte()
+    var bytes = this.board.readBytes()
+    if (bytes instanceof Buffer) {
+      var x = bytes[1] > 32 ? -(bytes[1]-224) : bytes[1]
+      var y = bytes[2] > 32 ? -(bytes[2]-224) : bytes[2]
+      var z = bytes[3] > 32 ? -(bytes[3]-224) : bytes[3]
+      return [x, y, z]
+    } else {
+      return false
+    }
+  } else {
+    return false
+  }
+}
+
+module.exports = AccelerationI2cSensor