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Need to build one HMI with lots of 7-segments on it as a Display for one industrial product. There are about 25-30 segments used. Please see the inline image.
There is also a keypad and few more LEDs.
Now how can I optimize the no. of I/O pins of a microcontroller? Which is the best way to drive these 7-Segments "Simultaneously!" ?
Even if I use a BCD-to-7Segment driver such as CD74HC4511, I will require atleast 5 pins per segment. So If I consider 30 segments in total, there will be around 35-40 uController I/Os (after muxing BCD Inputs)!!!! This will simply not work.
Please suggest me the better way out. Good if any reference schematic is posted. Any such IC that can drive more than 1 segment?
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In reply to rahul shah28:
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