The only Pentax provided facility for remote release on the K-x and K-r cameras is the front mounted IR. I quickly discovered the two big limitations: you can't easily use the remote from behind the camera to minimize vibration, and the range of the IR remote shrinks rapidly in sunlight. That is why I came up with this:
https://www.pentaxforums.com/forums/do-yourself/186110-make-wired-release-any...ir-camera.html It should also work well with Pentax P&S cameras that also lack a wired remote.
The K-30 has both IR and wired release ports. I can think of only one circumstance where you still might want to use my remanufactured IR release - damp weather. If you use a wired remote release with the K-30, you are opening one of the WR seals. You would avoid this using an IR release.
Not to hijack this thread, but the Triggertrap might save me some work constructing an Arduino based lightning / fireworks trigger. Does anyone know if the Android version can detect lightning or fireworks and react fast enough to trigger my K-30?