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This is timely. I was just about to post my arduino based top opener in the DIY section. It's maybe $30-$35 in parts and I've had mine in use since last March without any issues what so ever. It plugs in between the top switch, plus I ran the power to a switched +12 so it has no draw while the car is off.
It behaves the same as the power windows in that a quick push makes it fully open or close, a long press opens/closes it for the length of the press, and any length press while auto-opening/closing will cancel the auto-open/close.
It does use the bent pin, and I left the one-click parking break safety.
There are already two auto-open options available for $100-$200. I think a free open source option is the next iteration needed.
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