optically coded key


Posted on Feb 6, 2014

The optical key works as an infrared door opener for house, garage and the likes. Diagram 27. 0 functions as the key. It is a transmitter module which sends out a modulated infrared (IR) beam. The modulating frequency can be adjusted through P1. Diagram 27. 1 is the actual lock (receiver module). It uses a phototransistor to receive the IR beam comi


optically coded key
Click here to download the full size of the above Circuit.

ng from the key transmitter module. It compares the modulation frequency of the transmitter beam to its internal frequency. When the two frequencies match, the relay is activated, thereby opening whatever elecric door lock is connected to it.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Electronic ship siren
High-Voltage Pulse Supply
High- Or Low-Input Regulator
Long Period SCR Timer
Volt To Current
temp control fan hardware
wireless fm transmitter
MK484 AM radio circuit design project
Fundamentals of Electrical Engineering and Monostable Multivibrator
Induction automatic switch circuit
Automatic telephone call recording circuit



Top