Measure the total household electricity consumption.
Most electical meters today have a diode that transmits pulses in step with consumption. The diode is marked like "1000 imp / kWh". Put the phone's camera to the diode and measure consumption. The diode probably transmits in infrared so it will not be visible to human eyes, however the camera on the phone will see it.
More instructions on google+ site
https://plus.google.com/u/0/b/108719271699520743932/
衡量家庭总用电量。
最electical米今天有一个二极管步骤与消费发射脉冲。该二极管被标记,如“1000年进出口/千瓦时”。把手机的摄像头的二极管,并测量消耗。该二极管可能发射红外线,这样就不会被人眼可见的,但是手机上的摄像头会看到它。
在谷歌+网站更说明
https://plus.google.com/u/0/b/108719271699520743932/
Energy Meter更新内容
Improved performance and accuracy
Connect the app to WattDepot
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