They're all leftovers in the breadboard and not connected to or not necessary for the timer at this point. The transistor is driving the backlight LED but is not required for this small LCD; I was just being nice to the AVR pin because I used to have a much larger LCD attached to it with bright white backlighting. Likewise the resistors for the keypad (hidden under the keypad ribbon), they're not required at the moment either but I'm testing with them in order to start multiplexing some of the LCD and keypad data lines, which will save me 4 pins and allow me to put a rotary encoder on there to adjust exposures. Obviously once I do that, a schematic will be absolutely necessary.
Originally Posted by Monito
So at this point, yes, you can really build it with zero external components except for the relay-driver circuit. That will change a little soon.
Last edited by polyglot; 08-25-2011 at 08:30 PM. Click to view previous post history.