The only non-invasive current detector I can find has a 3.5mm jack on it so I wondered if I monitored the voltage across the port whether I could pick up the information in this way. Is there voltage monitoring on the 3.5mm port?
Does anyone know the maximum power/current/voltage I can put into the 3.5mm jack on my B+ without damaging it? I am using it as an input to monitor a variable external high voltage output.