Something Else

[Fanie]

Electric Door Lock (Pic-less)
For anyone interested, here is an electric remote lock for a door.
Key locks can be picked, hence using a code hopping remote is a lot more secure.
The lock uses an automotive striker motor which drives a couple of 12mm metal pins in or out of the the pane.

The door open/close sensor is a NO reed switch which is activated with a magnet when the door is pushed close.

If the door is closed, the reed is closed and the 2k2 resistor draws about 5mA from the 12V.

When the remote activates the Open (Oop) relay, the motor pulls the pins and the door can be opened by hand.  The remote allows about 1 second for the door to be opened.  You can hear the striker unlocking the door.

If the door is not opened, like when the remote is accidentally pressed, the door will lock itself again, essential, otherwise the door will be unlocked.
The self re-lock happens because when the remote activates the open relay, the 1000uF cap is rapidly discharged through the diode.  When the open relay closes, the 1000uF cap then powers the lock (Sluit) relay which locks the door.

If the door is opened, the reed goes open and the 1000uF cap is discharged by the 2k2 resistor.
If the door is then closed again, the reed closes and locks the door again by the cap charging up through the lock relay.
The 2R2 10W WW resistor is there to extend the striker motor's life.

This locking mechanism is in my front door for more than 20 years.  I did have a pic board in there to do basically the same, with a buzzer that warns every minute or so when the door is left open.  I suspect water got in the board (the wife has a flower pot above it), I couldn't find another board or the code for it between the hundreds of codes, so I decided to replace with the more robust electro mechanical setup.