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If you do not mind some soldering, this is an inexpensive approach: long 40-pin stachable headers: 20 for $18 https://www.ebay.com/itm/281394575257 6x8cm plated souble-sided proto board 20 for $14 https://www.ebay.com/itm/123934353296 Works out to $1.60 per hat.


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Is there a premade solderable HAT-like board Yes, tons of these are on sale. A quick search using words like "prototype" and "DIY" revealed there's a board called "ModMyPi", and there are certainly others:


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I find that strip-board or perf-board will fill the gap between bread-board and a PCB (although PCBs can be relatively cheap using pooled services). Some stripboards will have a special area on one end where you can attach a suitable dual row GPIO header (note that if you're not stacking them then you may not need a full size header, only one big enough to ...


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