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Question 1 and Question 2: I was wrong, this is not the correct way. @jsotola and @the_busybee, thanks for the clarification Question 3: @Nick_Gammon and @Majenko I think you are right, using i2c are more efficient ways to do. But, the @StarCat proposal is more compatible with my current solution. 74hc259 allows me set the state one by one and keep it until ...

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