I need to detect a device in my car. It has audible tones that I am building a lm567 circuit for now. However the same trigger can be achieved if I could find a way to detect that little yellow led with the same accuracy. ONLY the yellow led, not the green red or anything else, without obstructing it and must be VERY reliable.
Can it be done inexpensively?
Thanks.
Can it be done inexpensively?
Thanks.