I got an
RFID http://www.ebay.com/itm/250681401280?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_1036wt_1177
and a
electronic door strike http://www.ebay.com/itm/300567444686?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_500wt_1198
Anyways I want to set up an RFID door security system. I have one problem. The electronic door strike is a fail safe which means when power is applied it locks and when power is failed or shut off it opens. The thing is is that the RFID outputs power when the key is brought near which will lock the door strike instead of opening it and the rest of the time it is insecure. Is there some way I can make an inverter or something that when it gets power it stops giving power to the door strike. I wanted to use an arduino board but the output and input is only 5 volts and I will be using 12. Any help I can get is appreciated.
The easiest thing to do would be to use a transistor not gate.-an arduino is way overkill. Essentially, you want to use this schematic. Transistor Circuits . But you may need to add a switching transistor to the output to satisfy the load requirements of the door strike.
The electronic door strike is a fail safe
No what you describe is a fail secure system. A fail safe system unlocks the doors when it fails. It is safe because for example what happens if it fails during a fire, you are locked in.
Your system is designed for a latch lock not a mag lock. These things usually take a lot of current so you would be better off using a FET to do the inverting.
Thank you for your help bilbo. I will try to build one of those. I appreciate it.