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Thanks for the opportunity to make suggestions
I am planning to build this device and I shall make a minor mod to the circuit, On the flash pin I shall put a 4 channel optocoupler so that I can attach four flashes. I would suggest that for the next design you incorporate something like that only put all the flashes on separate pins and add the capability to control the flashes on separate delays.
I think I read that you removed the drain feature. I would recommend you put that back in.
I support a previous suggestion for keeping favourite settings, perhaps as a series of preferred settings. This could be done in the android/pc or in the arduino eeprom