This mains AC Relay module uses a 5V relays that can run straight off the Arduino and switch 230V, following the circuit on the arduino website here: relays. pdf I`ve built my own (very simple) evergy monitoring and control system (using Arduino 2009), using off the shelf wireless remote control sockets, and power meter LEDpulse detection. Its not
Click here to download the full size of the above Circuit.
a perfect solution as all sockets suffer from random turn on / turn off, (Watts Clever has several reports of this issue), but it removes the need for wiring mains voltages. ;-) BTW. I also have a 4 channel relay unit (eBay $10), which has optoisolators etc and works really well. I think its cheaper and easier just to buy these modules than to buy individual components and build it ;-( I`m sort of following in your footsteps. I have an Arduino measuring my mains usage for the whole house running a small web server using a Wishield. I blatantly stole your code for the code measurement (thanks for your help with this) and am using Pachube to create basic graphs on the web. My experience with mains power is pretty high here in the US with our split phase 220 and your relay example may give you a bit of trouble. What I`ve done for an electric water heater is a 5 volt relay switching a 24 volt supply to a 40 Amp contactor. 24 volt contactors are widely available for use on air conditioning and 24 volt transformers are easy to find for this reason as well as some doorbells. The currents you`re going to be working with need BIG contacts and high reliability contactors or you`ll be surprised by a failure in the middle of the night. I recommend a 24 VAC transformer and contactor between the mains and your 5 VDC relay. It`s simple enough and will protect your circuitry as well as give you the ability to put the Arduino in a...
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