29 Oct '13, 2pm

An Overly-Complicated Logic Chip Clock

In a grey past I built myself a darkroom process timer. You know, develop for x minutes, rinse, fix for y minutes, etc. With colour processes, everything is done in drums or in total darkness, with no way to check progress as you would be able to when doing B/W under appropriate safe light. It allowed up to 128 processes to be stored, each with up to16 process steps. For each step it would indicate the agitation regime (continuous, or 2/3/4/6 times per minute), whether it was a rinsing step or a true process step, with its step number, and it would start beeping 10 seconds before the end of each step. The contraption occupied three 10x16cm Europrints, with about 80 4xxx logic gates in all. It had a keypad for entering values, several shift registers, binary and BCD counters, and some kind of state machine. Storage was two 2k*8 static CMOS RAM chips, with a 4.5V battery for...

Full article: http://hackaday.com/2013/10/29/an-overly-complicated-logi...

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