I'm designing a handheld device that has just a few buttons that will make some configuration changes. (Very much like a game controller) I'm currently making a set of 3 prototypes - a production run if any will be less than 25 units.
I want to use a SMT tactile switch on a small pcb and a switch cap that I'll have made (machined out of Delrin or 3D printed). The enclosure (plastic or a thin aluminum sheet) will have holes for the switch caps.
Why type of membrane should I used to make the enclosure watertight (to IP67)?
How do I shield for EMC?