Looks similar
Greg (2017)(blog.samaltman.com)
247 points by admp | 112 comments
Building an occupancy sensor with a $5 ESP32 and a serverless DB(matthew.science)
603 points by sodality2 | 198 comments
Blog post describing how the author built a campus occupancy sensor using a $5 ESP32 counting Bluetooth devices and a serverless database.






