This free app lets you play around with smartphone sensors you probably didn't know existed.

The Compact Magnetic Sensor (CMS) is a low cost, low power, weatherproof device that detects small changes in Earth’s magnetic field. It is capable of running in battery mode for a week in various ...

Magnetic sensors quietly underpin everything from smartphone compasses to the stability systems that keep electric vehicles on the road, and the race to make them smaller, faster and more sensitive is ...