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why not chose a 12v extend relay board? it's commonly used in market. not chose 5v level version.
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Hi, thank you for your answer.
1. Unfortunately it doesn't bring me closer to the solution of the problem how to use the devices I own.
2. 99% of 16 channels relay modules on the market are the one I mentioned in the first post. There are 2 types of working voltage 5V and 12V but both types have low-level steering inputs. I know, the best would be to use Kincony's KC868-E16 but it's 20x more expensive.
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if you want to use your own 5v extend relay board. you need add a level convert circuit. convert 5v -- 12v level.
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I will probably use 2x 8 channel PC817 Optocoupler to control 5V circuits with 12V.
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it's ok, add a Optocoupler for convert.