Hacker News new | past | comments | ask | show | jobs | submit login

It's not super accurate, but most cars these days also have outside temperature. Add a humidity sensor inside and outside, and we have temperature and humidity inside and outside the car, which should give us enough information for a basic microcontroller to approximate the temperature differential across the glass and whether or not fog (or frost) is likely.

Applications are open for YC Winter 2020

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact