The system is composed by a WI-KEY and a WI-LOCK.
The WI-KEY is composed of: wireless power transmitter, a small power bank and a switch.
The WI-LOCK is composed of: wireless power receiver, and solenoid to make the unlocking movement.
When the WI-KEY reach the WI-LOCK (hidden inside the wall, or inside the box or other), the WI-LOCK gets the power supply and the solenoid moves backward, unlocking the lock.
As soon as the WI-KEY is outside the wireless power supply range, the WI-LOCK will lock the device; closing the door it will lock immediately.
As the wireless power supply needs to have the transmitter and the receiver quite close to each other, the wireless power receiver could be placed near the external side and just the 2 wires go inside the strongbox; in case of very thick wall it’s possible to place also a wireless antenna outside the strongbox to make the wireless connection possible.
Wireless is the best choice because:
1) There are no batteries inside the strongbox, this prevent any kind of acid leak from the batteries and malfunction of the power supply system, because it’s not there.
2) No external power supply needed, so it’s possible to use it everywhere.
3) No mechanical part visible from outside. It’s very easy to make a secret hiding.
4) It’s not possible to forget it unlocked, without the key the system will lock automatically, as soon as the door close, it will be locked.
Here how it works:
Here how to make it:
Connect the switch on the power supply wire (RED), so it’s possible to switch off the power supply.
Find a little case, fill it with the Wireless Power Transmitter, the Power Bank and fix the switch.
Find the box you need to lock.
Mount the lock in the box, connect the solenoid with a thin rope (I have used a fishing wire). Put the Wireless Power Receiver in the cover. Check if the Power is transfered before to fix it, in case find the best place to fix the receiver.
Check that the lock move enaugh backward to unlock itself from the bottom side.
Wireless Power Transmitter:
Connect the Vin pin to one switch, connect the switch to the RED wire of the USB cable.
Connect the GND pin to the BLACK wire of the USB cable.
Wireless Power Receiver:
Connect the OUT pin to one wire of the solenoid (it does not matter which one).
Connect the GND pint to other wire of the solenoid.
Transmitter Module FT1235M + COIL
Receiver Module FT1236M + COIL
Solenoid 5 Volts
Power bank + USB cable
A kind of lock