In this position the delay timer is enabled by the reed conduction, which eventually operates the relay after the set delay has elapsed. The reed switch and the corresponding magnet on the door ensure that the delay timer is activated only while the door is perfectly at the center of the door frame and is stable. How the Delay Timer is Activated with Reed Switch However in the shown circuit design, the specified delay operation is controlled by two parameters, 1) the reed switch, and the opto coupler IC (with the attached BC547 transistor). Normally the delay timer is supposed to operate the relay after some delay as soon as the circuit is powered with an input supply of 12V. The circuit shown above is a simple delay ON timer circuit using T1, T2, R2, C2 as the main components. The basic electro-mechanical configuration for the door could be done as indicated in the following diagram Mechanical Details of the Door Instead, a vertically hanging type of door (hinged at the upper edge) would be much easier to tackle and equip with the required electronics. ![]() For example a sideways opening door or a sliding type of door could be quite complex to configure. The preferred door specification for this project should be such that it does not require a complex opening or closing operations. The proposed electronic dog door circuit or electronic door circuit for pets can be easily built using a simple electromechanical lock set-up and a homemade Rf transmitter, receiver circuits.
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