I have this door bell at home. Im trying to connect the bell to my PC such that when sm1 rings I can have like smthng on my PC to tell me that some1 is ringing the bell.
Im using the parallel port to do that, so i need the input to be either 5v or 0v.
the voltage between the bell terminals in its idle state is 12v RMS (AC voltage) [how is this possible?] and it is 4v RMS when some1 rings. [Guys i dont understand isnt it supposed to be the opposite? higher voltage when sm1 rings?]
So i want to do manipulation to these voltages such that they become 5v and 0v DC. My questions here:
1- is the 12v and 4v RMS has any DC value? how can i measure that value?
2- Im thinking of using a Low Pass Filter to get rid of the AC and have DC value, then use a regulator. But what if the RMS value has no DC?
3- Is there a regulator or smthng, that can have 12v RMS AC value and give an output of 5v DC? and if input was 4v RMS the output is 0v?
Guys u get the idea of my design, help me here plz.
Im using the parallel port to do that, so i need the input to be either 5v or 0v.
the voltage between the bell terminals in its idle state is 12v RMS (AC voltage) [how is this possible?] and it is 4v RMS when some1 rings. [Guys i dont understand isnt it supposed to be the opposite? higher voltage when sm1 rings?]
So i want to do manipulation to these voltages such that they become 5v and 0v DC. My questions here:
1- is the 12v and 4v RMS has any DC value? how can i measure that value?
2- Im thinking of using a Low Pass Filter to get rid of the AC and have DC value, then use a regulator. But what if the RMS value has no DC?
3- Is there a regulator or smthng, that can have 12v RMS AC value and give an output of 5v DC? and if input was 4v RMS the output is 0v?
Guys u get the idea of my design, help me here plz.