Here’s an ESP8266 magnetometer that opens a driveway gate when it detects the car. Posted in Arduino Hacks , green hacks Tagged arduino nano , hall effect , hall effect sensor , magnetometer , oled ...

Well tech tinkerer Joe Desbonnet has whipped up what he dubs "poor man's NFC" using an Arduino, some magnet wire, and any compass-equipped Android smartphone (which is almost all of them).

The magnetic compass has been a crucial navigational tool for around a thousand years or so, perhaps longer. While classical versions still work perfectly well, you can now get digital magnetometer… ...