All this simplicity doesn't mean however that the unit lacks features. The current software has many trigger functions including One Shot, Light and Sound, Lightning, Light barrier, Interval and Manual/Bulb. It also has built in a Water Drops function which when combined with a simple external circuit driving a water valve and flash some spectacular photos may be taken.
Step 1: Construction
Step 2: Software
The user interface for the trigger is via two LED's a push button and a piezo speaker. The unit may also be connected via the programming port to a program such as Hyper Terminal which provides a text based feedback display but it is not necessary for normal operation making the unit totally portable.
Built in functions are : High speed One shot, Repeat, Sound and light Trigger, Digital input trigger, Water Drops mode, Time interval trigger and Manual/Bulb mode. There is a built in configuration mode to pre-set timings and options.
Complete Code listing, schematic and user documentation is available from my website.