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I need a unit that will enable me to control a 4 digit 7 segment led display to read a set number imputed by user this setting would need to be retained when powered off and then back on. even though I have stated a 4 digit 7 segment led display. If you could advise on another product i would be open to ideas this unit needs to be small as possible. I would need to know how much time this would take and a cost for the prototype this could lead to a mass production requirement