Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.
Sign up to join this community
I'm trying to control my garage door remote with a GPIO pin from my Raspberry Pi. The following is my schematic diagram of what I am thinking of using:
Would there be a potential problem if I were to hold down the push button and activate the transistor and allow current to flow through at the same time?
*If there is no conflict could you explain why that would be the case?
There will be no conflict between the transistor and the button, but the whole circuit won't work in first place. To get it work as pictured, the GPIO signal must have 9-something volt level, which you don't have.
But you can do try this instead:
ADDITION: There will be no conflict because there is nothing to conflict with - both components (a transistor and a switch) are both switches connected in parallel, so it is one OR another. Zero voltage across emitter-collector doesn't hurt, and even in the original (incorrect) schematics the base-emitter junction will be reverse powered, and won't conduct anything into RPi (as long as reverse e-b voltage doesn't break the transistor).
If you don't know the circuit around that switch, the safe thing to do is to use a small reed relay - the relay provides full isolation between the Pi and the remote, and its contacts won't care about polarity or AC/DC.
