Hello,
I'm interested in designing/developing (although I don't know much about electronics) by own secuirity system for my house. This will consist of two systems, a wired electromagnetic sensor switches (to detect open/closed doors and windows) and a camera system (approximately 8 cameras, that will feed video to 3 TV's around hte house).
What I would like your help to design the circuit to connect the sensors to a controller unit (the designed circuit) which in-turn will be connected to the PC's USB or serial RS232 port (preferably USB).
Once the PC picks up the signals, I can get the necesary Software written to alert me or do something (maybe activate a few relays on hte same designed circuit to sound an alarm, light etc).
The tricky part is this: I would like to seperate my house into zones, preferably about 6 -8 (although this is not essential). and I would like to connect multiple sensors (e.g. 10) to a single wire pair (or to each zone wire pair)that will run around the house.
So in order for this to work, each sensor has to send a unique signal which the controller unit will identify. This is the reason for the zones, i.e. if the unique signal combination in less than 50, it's better to split the wiring into zones so that you can have x number of unique signals per zone, increasing the coverage. Ofcourse if you can have the number of sensors greater than 50, I suppose we can scrap the zone story.
could this be achieved by a 2 wire wiring, or will you need a 4 wire cable? also another Idea I had was to make small cuitcuits that will be placed in each room of the house, that will have approx. 6 sensors inputs. this will allow the additional wiring to be done only within the room, also it will make the door/window sensors small.
I'll talk about the camera requirement in a seprate posting.
your reply, ideas and solution is greatly appreciated.
I'm interested in designing/developing (although I don't know much about electronics) by own secuirity system for my house. This will consist of two systems, a wired electromagnetic sensor switches (to detect open/closed doors and windows) and a camera system (approximately 8 cameras, that will feed video to 3 TV's around hte house).
What I would like your help to design the circuit to connect the sensors to a controller unit (the designed circuit) which in-turn will be connected to the PC's USB or serial RS232 port (preferably USB).
Once the PC picks up the signals, I can get the necesary Software written to alert me or do something (maybe activate a few relays on hte same designed circuit to sound an alarm, light etc).
The tricky part is this: I would like to seperate my house into zones, preferably about 6 -8 (although this is not essential). and I would like to connect multiple sensors (e.g. 10) to a single wire pair (or to each zone wire pair)that will run around the house.
So in order for this to work, each sensor has to send a unique signal which the controller unit will identify. This is the reason for the zones, i.e. if the unique signal combination in less than 50, it's better to split the wiring into zones so that you can have x number of unique signals per zone, increasing the coverage. Ofcourse if you can have the number of sensors greater than 50, I suppose we can scrap the zone story.
could this be achieved by a 2 wire wiring, or will you need a 4 wire cable? also another Idea I had was to make small cuitcuits that will be placed in each room of the house, that will have approx. 6 sensors inputs. this will allow the additional wiring to be done only within the room, also it will make the door/window sensors small.
I'll talk about the camera requirement in a seprate posting.
your reply, ideas and solution is greatly appreciated.