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Reading the not so smart meter

Today I completed another small project. I’ve got this ‘smart meter’ in my house. The smart bit is that automatically sends off the meter data to the network provider. But I can not see the actual power usage from inside my apartment.

My meter has an infrared LED interface (right next to the meter above 1000 imp / kWh), which gives a pulse for every kWh consumed. By measuring the time between pulses and to count I’m on a current consumption in watts (3.6 / pulse duration to be exact).

I already had a sensor network running based on my previous Simplyduino project, so the addition of a new node was a quick job.

The graph shows that it works well. I still can not explain all the peaks, but the high consumption (800W) between 10:30 and 16:00 is my electrical water boiler.  The other major consumers are the refrigerator, the coffee and tea (for short peaks).

Measuring is knowing!

IR sensor diagram (led1 not used for now).

2_Schematic_-__Users_rob_Projects_Arduino_SmartMeter_SmartMeter_smartmeter_sensor_sch_-_EAGLE_7_5_0_Light

 

Closeup of the meter

IMG_3187

 

Sensorium graph:

Chart_-_Sensorium