This is a new app, less than 7 days old, and it has now just been updated. It works as a DSLR remote control, timer and or HDR controller to your DSLR.
DSLR Remote enables you to take timer controlled exposure series (e.g. for time lapse), long time exposures or exposure sequences in the context of High Dynamik Range photography. All you need ist a small, inexpensive and easy to build hardware, which is then connected to the ear phone jack of your smartphone. You will find detailed instructions on how to build the required hardware on then authors website (http://bitshift.funpic.de).
This update includes – – Visualization of the parametrized sequence in HDR mode, including highlighting of the current shot or pause during the run.
This is a warning from the developer: "a few smartphone types do not output high enough volume on their ear phone jack to make the infrared harware work properly. In addition a few camera types are still not properly controlled remotely via the infrared receiver. In that case you might want to choose the cable control instead".