venkates2218
Full Member level 6
In my project i'm going to interface thermal overload interlock,compressor overload interlock with PIC18F4520 controller.
Interlock having two terminals,when the actual value is greater than set value means two terminals will CLOSE and make an loop.
An negative supply from the +5VDC is connected to one terminal of interlocks and another terminal is connected to PIC controller for sensing.When the interlock is closed means PIC have detect it.
My doubt is,
Is this correct way for input sensing or have to use optocouplers or some other methos have to follow