I have a AC Current Sensor like this SCT013-030 (30A/1V) for energy monitoring.
And this is connected to my Particle Core like this:
Do you know it is safe for the Core if the (5V) power supply is down? (no more voltage (3,3v) in the divider circuit from the core, but potential current in the sensor)
From my point of view, the analogue input (A3) of the Core will be exposed to negative voltage… right? (because we loose the mid point)
Do you see any solution or is it safe for the Core to keep it like this?