I want to detect with a microcontroller if a fuse has blown. The circuit with the fuse is 12V when on (it is not always on, so I need to distinguish between a blown fuse and the circuit not running). The microcontroller can only handle max. 3.3V.
I thought about using two optocouplers like this:
Is there a better solution you would use?
3.3V-
is essentially the ground (0V) for the MCU? And that12V-
is the ground for the +12V supply? \$\endgroup\$ – Tom Carpenter May 23 '18 at 23:07