I seem to have inherited a project that was abandoned after being started.
We have 4 individual numbers 4ft high and run by 10 light bulbs each (wired as 7 segments)
I bought: 2x 16 relay boards An arduono mega 2 switches (1 for increasing the number and 1 for decreasing) And some cables and connectors.
I didn't want to use an i2c chip because I felt the mega had enough pins(based on the fact sheet)
Does anyone have an example sketch for such a thing? I have seen a few 2 digit ones but no 4)
I planned to use the internal pull up resistor for the switches. Any issues there?
Any concerns with powering 28 relays? Each relay board has a power connector so really only need enough power to drive the board signals.
Is there an easy way to "turn off " the display? Could another switch just break it out of the relay firing loop?
Lastly- is there a recommendation for how often to write to the eprom? I want to store the number so I won't have to start from 0 but was concerned about writing it every minute.
All help is appreciated !