ZCC220L-232 is a high accuracy plane digital compass module.Its working principle: Two axis perpendiculars with each other induce the earth’s magnetic field at the same time then calculate the azimuth. It communicates with PC via TTL interface. It features stable performance and high accuracy. Also it has calibration function and you can get accurate azimuth wherever. There are both continuous and inquiry output mode. At the same time it has declination angle and installation angle compensatory function. It can suit different working conditions.