Hello!
I want to build my own continuity tester, a rather simple one actually.. My idea is
to send a 5V-signal from a PIC through the "probes" and back to a
optocoupler (4N33) that tells the PIC that we have connection (continuity)!
Now the problem is.. what if someone was to put mains voltage on these probes?
Here in my country (Sweden) we have 230V/50Hz, and I don't think the
5V-circuit would like this so much.. so does anyone have a good idea how to
1) protect the circuit from being damaged and 2) tell the user that a
continuity test cannot be performed due to the voltage applied on the probes?
And just to keep it simple, by "telling the user" I mean light up a LED or something like that.
Thank you very much!
I want to build my own continuity tester, a rather simple one actually.. My idea is
to send a 5V-signal from a PIC through the "probes" and back to a
optocoupler (4N33) that tells the PIC that we have connection (continuity)!
Now the problem is.. what if someone was to put mains voltage on these probes?
Here in my country (Sweden) we have 230V/50Hz, and I don't think the
5V-circuit would like this so much.. so does anyone have a good idea how to
1) protect the circuit from being damaged and 2) tell the user that a
continuity test cannot be performed due to the voltage applied on the probes?
And just to keep it simple, by "telling the user" I mean light up a LED or something like that.
Thank you very much!