Wire.h - No need to included it at the top of your sketch. QMC5883L Compass will included it for you. Just ensure that it is installed in your IDE. QMC5883L Compass Library calculates the direction ...

This article is copied from my memo which I wrote for myself to keep track of my casual stuff. This memom is publicly available on http://hobbylogs.me.pn/?p=17#more ...