[Stephen] wired up an opto-isolator so that when the motor runs, the reed switch is triggered but not fried, and the event gets logged in Google Sheets. Any missed meals are weeded out with a ...

Rather than directly connect the lines, however, they pass through an opto-isolator. This is important, as it allows two computers at different ground potentials to be safely connected to each ...

LDRs – or vactrols, as they’re otherwise known – are a type of opto-isolator (“a component that transfers electronic signals between two isolated circuits by using light”), which are not ...