Ran across this project, i think it has real possibilities… Stack as many boards as req’d.
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Was looking for something like that, seems there a multiple out there premade up to 32 channels,
How many sections would u like to add?
https://www.google.com/search?q=i2c+relay+board
Picked some up on eBay a few years ago, for a house heating system control.
Haven’t been able to find any more since…not much chance now with all that’s going on!