example: Add ambientlight example using dh1750

Origin: https://github.com/tizenteam/node-i2c
Forwarded: #99
Change-Id: I2ea802fa46de654d3c45acd667afefb7ff88da76
Signed-off-by: Philippe Coval <[email protected]>

Author: rzr

examples/ambientlight/ambientlight.coffee

@@ -0,0 +1,33 @@
+# SPDX-License: BSD-3-Clause-Attribution
+# Info: https://github.com/abandonware/bh1750
+
+Wire          = require '../../main'
+
+GET = 0x10
+
+
+
+class Ambientlight
+
+  address: 0x23
+
+  constructor: (@address) ->
+    @wire = new Wire @address;
+
+  read: (callback) ->
+    setTimeout =>
+      @_read GET, 2, (err, buffer) ->
+        if not err
+          data = ((buffer[0] <<8) + buffer[1]) / 1.2;
+          callback null, data
+        else
+          callback err, null
+    , 200
+
+  _read: (cmd, length, callback) ->
+    @wire.readBytes cmd, length, callback
+
+sensor = new Ambientlight(0x23)
+sensor.read (err, data) ->
+  console.log data
+