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  • Great tutorial! Do you think I can make it on the inverse, in terms of making the arduino open the door when power is out?the thing is, I want to install sth similar, running on batteries and with a WiFi shield to send the signal ("please, open the lock") via Internet. But I don't want the door to keep locked once the battery runs out. I prefer the door opening in this case (yes, the whole thing would be useless by then, but you can change the batteries). So I thought that maybe, if with the 12v I could make the lock keep closed instead of opening, then I could bypass the problem of not being able to ever open the door again because I've run out of batteries.I still have to do my research and see if I can definately power this whole system with a handful of AA batteries.Thank you

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