A QFN-8 chip on a finger, pads up.
https://object.ceph-waw3.hswaw.net/mastodon-prod/media_attachments/files/112/089/163/172/947/123/original/14b2b9715a576e77.png
In 2024, $.32 gets you a Cortex M0, 4kB RAM, 16kB flash and a built-in 24MHz oscillator. All in a package that's terrifyingly close to being accidentally swallowable.
(index finger for scale - blurred so i don't get comments about fingerprint opsec)
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