What it is
The seat-sensor side of Kiasu Hawker, from Samsung Solve For Tomorrow 2022 (1st runner-up). Crowded hawker centre, you want to know which seats are free.
Context
This was the hardware next to the Android app, React site, and Laravel API. Same competition write-up here.
How it works
ESP32s plus sensors decide if a seat is taken. Node-RED ships that into SQL. The apps read it and point people at empty seats.