![]() ![]() ![]() We've employed this single 4511 to drive up to 6 efficient, common cathode, LED displays. This is followed by brief "All OFF" period - and then method is repeated for next display. transistor) to pull the common cathode of each display to ground - in that particular display's "ON" period. Technically this technique is called, "Time Division Multiplexing" and is achieved by strobing data into that single 4511 100Hz or so rates - and employing an extra GPIO (w/ some current buffering i.e. ![]() Multiplexing enables a single 4511 to drive multiple 7 Segment Leds. Repeat this process for the 2nd 4511 -> digit.Īnd - you can save even more GPIO. Only that data present the moment the targeted 4511 receives the strobe signal will be latched into that particular 4511 - 2nd 4511 will be unaffected. (unique strobe connections) In so doing you've reduced the GPIO requirements from 8 to 6. Trick then is to harvest 2 more GPIO - connect one each to the strobe pin of 4511. To conserve MCU GPIO - you may connect those same 4 MCU GPIO/data pins in parallel - to each 4511. And - you have a "strobe" pin on the 4511 - which critically enables those 4 data bits to see additional use. Your 4511 requires 4 data bits to produce 0-9 numeric representations upon display. You must become more resourceful to better succeed both in school & thereafter. ![]()
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