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July 7, 2011
Tutorial - Controllable Power Outlet
about 8 years ago
Good link, useful information. Thanks for that. Only one SMALL complaint. Please don't use Comic Sans as it burns my eye. Oh the pain!
For the record, my relay seems to be pulling a stable 134mA in use (and the transistor is puling around 4mA from the Arduino output). I had some strange errors which I think were surge related so powered relay of its own dedicated supply (not off the Arduino rails).
I'm was having similar problems with one of these used alongside an LCD. I was driving everything from an Uno. It was stable for awhile but started sending my LCD haywire after clicking in and out (not quickly). I'm thinking it's a surge thing when pulling back in.
Anyway, I knocked up a separate 5V regulator circuit on the breadboard and drove it from the same 9v wall-wart which powers the Uno. I used the new 5v for the relay supply alone and the problems have gone.
In short, although I can't confirm this, it seems that the reg on the Uno board wasn't quite up to the job, it wasn't the wall-wart as I first suspected.
Hope this helps someone.
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