Hi all, I'm new here so sorry if I act like a newbie.
I have a security gate that is opened via a computer software, it's a complex system that only allows entry for members to the area at certain times of the day, it allows you to self-pay your membership on that computer etc.
So the software developer showed me that when I signal a specific Port with a -5V current for a second the computer gets notified, & it sends a signal to unlock the door. It can also be done via closing a circuit (closing the output of that Port with the input)
So I want to install a telephone line, that when it gets a call, it should close the circuit for a second, then right away release the circuit.
(In case of emergency, the managers should be able to open the door remotely with a phone call to a specific number)
Basically I'm looking for relay that gets powered when the telephone is supposed to ring, bit the relay should only close once & reopen after a second, or remain closed till the phone finishes sending ring pulses.
I researched for a telephone powered relay, but only found relays that close & open with every ringi. If it closes the circuit with every ringr then the computer will get a few signals to open the door, whilst I only want it to open once.
So please if anyone knows of a relay that does the above mentioned, please reply.
Thanks in advance
I have a security gate that is opened via a computer software, it's a complex system that only allows entry for members to the area at certain times of the day, it allows you to self-pay your membership on that computer etc.
So the software developer showed me that when I signal a specific Port with a -5V current for a second the computer gets notified, & it sends a signal to unlock the door. It can also be done via closing a circuit (closing the output of that Port with the input)
So I want to install a telephone line, that when it gets a call, it should close the circuit for a second, then right away release the circuit.
(In case of emergency, the managers should be able to open the door remotely with a phone call to a specific number)
Basically I'm looking for relay that gets powered when the telephone is supposed to ring, bit the relay should only close once & reopen after a second, or remain closed till the phone finishes sending ring pulses.
I researched for a telephone powered relay, but only found relays that close & open with every ringi. If it closes the circuit with every ringr then the computer will get a few signals to open the door, whilst I only want it to open once.
So please if anyone knows of a relay that does the above mentioned, please reply.
Thanks in advance