I am looking to activate a switch on a sensor platform I have, via a GPIO(3.3v) pin on a Raspberry PI. The board itself is powered by the Pi, via USB. The problem is, I have very limited electronics experience, so I'm hoping someone can advise me.
The switch looks quite easy to bypass if I solder to the underside of the board. I was thinking of something like Using an NPN transistor, but would like some expert advice before I attempt anything.
One more thing, would you advise me to put some form of GPIO protection circuit into the design?
Edit Testing the sensor board, it appears one of the pins on the switch is grounded, the other is to some pin on one of the IC's
Edit #2 Voltage across the switch is 5.07v when open, and ~500μA current when closed
simulate this circuit – Schematic created using CircuitLab