Another small but interesting project is power monitoring usage using Arduino.
The idea was to be able to get instant feedback on my home power consumption.
So I bought some CT sensor from EBay (9 euros/each) . The only problem is that I have a three phased installation. So instead of two phases as usual, (three wires) there are three phases and four wires.
The installation was made in two steps: first a breadbord connected to the CT sensor and the arduino, sending the information every ten seconds on OpenSensorCloud using an Eternet Shield.
The advantage of having a three phase installation is that you can display each phase individually, so it gives you much more indication on what is currently hapenning. For instance, I no that on Phase 3 there is the heat pump installation, on phase 2 the kitchen, etc…
The sketch is here:
As a bonusI wanted something to display these data in the living room, so I used the spark core that I bought as an #IoT geek: the core is connected to the server and receive the data every ten seconds. This is probably not the optimum configuration (Ethernet -> Server -> Wifi -> Spark core) and I plan to do an updated version if a different connectivity. In the meantime, the result is quite nice: the core display the total consumption and the phase consumtion ona small olde display, as well as the usage graph of the last ten minutes.
The RGB led of the core is also used to provides feedback on power usage: green -> low usage, red, high usage