I mean a device that locks or unlocks when when it recieves some current
I'm coupling a 4 digit lock circuit using LS7220 IC's. Please can someone tell me which electronic key powered by the relay to use and how to connect it. From Nigeria
I also have a touch plate and an LDR powered intruder alarm. When they are powered, the alarm turns on first without detecting anything. Is there anything i can do to stop this because, if the system is on and power fails, before it switchs to alternative source of power the alarm goes on. The circuits are on https://www.circuitstoday.com/wp-content/uploads/2008/03/touch-plate.JPG for the touch plate and https://www.circuitstoday.com/wp-content/uploads/2008/03/intruder-alarm-circuit-1.JPG. Again the intruder alarm doesn't respond to normal walking pace.
If the right combination of keys are pressed, the lock opens and remains open for some seconds and then locks again. [/url]