I am working on a design for an model rocket launcher. I have an Arduino Nano Every in the design, and am hoping to use that of the continuity test. When the user presses the cont. check button, it will flip a relay, connecting the igniter directly to the batteries. The problem is that I have no way to tell if the circuit is complete, or if the igniter has a fault. I need some way to tell if current is flowing and the circuit is complete.
I don't think I can connect the igniter to the Arduino's IO pins, as they are only limited to 40 mA. I know a relay could work but I think there must be something better. I also know I could run the wire through a inductor, but that wouldn't really work for a PCB. (The end goal of the project)
Does anyone know of a component or process that can do this?
Thanks!
EDIT: Could something like this be useful? What is "Arduino Optocoupler Disease"?