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A comment on The Amazing $1 Microcontroller (2017). Parent comment

Re:The Amazing $1 Microcontroller (2017) by candiodari on Wednesday May 08, 2019 @04:18AM (#19856875)
I wrote a firmware that lets me turn any attiny into a gpio-to-i2c and supports in-place-upgrade also over i2c.

Now I have up to 20 extra gpio for 0.5$ or so. This is not very hard.

[ Parent | on HN ]
Re:The Amazing $1 Microcontroller (2017) by foldr on Wednesday May 08, 2019 @10:01AM (#19858867)
The thing with this kind of setup is that it almost always works out cheaper to just buy a microcontroller with more pins. For example, you can easily get hold of 48 pin Cortex M0 parts for under $1.
[ Parent | on HN ]