Did you know about using saturated salt solutions to produce constant humidity levels for calibration? We didn’t. The eBay hacker favorite, the so-called DHT22 module, doesn’t fare all that ...

The screen cutout is filled by a 84×48 monochrome Nokia display, and the rest of the cabinet’s interior is stuffed with a CNC-milled PCB, temperature and humidity sensors, an RTC, and a ...