I reckon I could put a reed switch ( www.explainthatstuff.com/howreedswitcheswork.html ) against L1 and L2 wire and somehow rectify the small magnetic field that is given there when L1 or L2 has current flowing through it. Anyone know if this would work ?
I reckon I could put a reed switch ( www.explainthatstuff.com/howreedswitcheswork.html ) against L1 and L2 wire and somehow rectify the small magnetic field that is given there when L1 or L2 has current flowing through it. Anyone know if this would work ?
I reckon I could put a reed switch ( www.explainthatstuff.com/howreedswitcheswork.html ) against L1 and L2 wire and somehow rectify the small magnetic field that is given there when L1 or L2 has current flowing through it. Anyone know if this would work ?
What about a Hall effect sensor ? Will the current change enough in L1 or L2 when a portion of the current goes down there, when closed, to activate a Hall effect device ?
I reckon I could put a reed switch ( www.explainthatstuff.com/howreedswitcheswork.html ) against L1 and L2 wire and somehow rectify the small magnetic field that is given there when L1 or L2 has current flowing through it. Anyone know if this would work ?
No it won't The magnetic field from the current in the wire will be far too small. The sensitivity of a reed switch is measured in amp turns when being operated by current in a coil. At least 10 to 20 amp turns are needed for small reed switchs.
1 amp in 20 turns or 20 amps in one turn are the same.
I have never encountered any that would not be an utter PITA to live with. And look at the complications this one is introducing - it's created a problem which simply would not exist if you did not have it.
And all because you can't be rsed to use a switch:
I now know how much time I spent over the years (wasted) fiddling with hall landing switches.
Your problem is interfacing the PIR with the manual switches and being able to tell whether the light is on due to the PIR or the manual switches.
Without having an indicator lamp to indicate that the manual switches are in the ON state you will not be able to know whether it is the PIR or the manual switches or both that have turned the lights on.
As you want to solve it your self here is a hint.
Two intermediate switches can be wired up to produce a change over function that will turn either the lamps ON or a small indicator ON when the main lamps are OFF. Then if the lamps are ON and the indicator is also ON then you will know the PIR is ON and the manual switches are OFF and that the lamps will go OFF when the PIR times out.
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