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+ sitehttps://plus.google.com/u/0/b/108719271699520743932/
VERSION HISTORY
- Version 2.3 posted on 2014-10-31
Improved performance and accuracy,Connect the app to WattDepot - Version 1.7 posted on 2011-05-03
Several fixes and updates
Program Details
- Category: System Utilities > System Maintenance
- Publisher: Jon Lennersten
- License: Free
- Price: N/A
- Version: 2.3
- Platform: android