I am trying to put together a circuit to take a signal from a fingerprint reader and turn it into a signal to open a latch.
Long story short, I have located pads on the fingerprint reader that are high (~3-3.5v) when the proper fingerprint is swiped and low (0v) when no finger or the wrong finger is swiped. Here is my problem. To activate the reader a button is depressed. For a split second the area that I would like to use goes high then immediately goes back to low.
To remedy this I need to make a circuit that will only accept a high signal that lasts more than 1 or 2 seconds. It will disregard any high signal that lasts less than one second. Then this circuit can ultimately trigger my relay or latch to open the door.
I know this probably sounds simple, but I am a beginner. To give you an idea, I have been poking around on this circuit board for days (literally) with a multimeter looking for a suitable set of contacts. I understand basic resistors, capacitors, transistors and that sort of thing. Please ask any questions needed for clarity. Also, when responding talk like you would to a 2nd grader.
Long story short, I have located pads on the fingerprint reader that are high (~3-3.5v) when the proper fingerprint is swiped and low (0v) when no finger or the wrong finger is swiped. Here is my problem. To activate the reader a button is depressed. For a split second the area that I would like to use goes high then immediately goes back to low.
To remedy this I need to make a circuit that will only accept a high signal that lasts more than 1 or 2 seconds. It will disregard any high signal that lasts less than one second. Then this circuit can ultimately trigger my relay or latch to open the door.
I know this probably sounds simple, but I am a beginner. To give you an idea, I have been poking around on this circuit board for days (literally) with a multimeter looking for a suitable set of contacts. I understand basic resistors, capacitors, transistors and that sort of thing. Please ask any questions needed for clarity. Also, when responding talk like you would to a 2nd grader.