Last Revision:
Version 1.2, 2010-06-28
Updates to make project compatible with iOS 4.0 SDK
(Full Revision History)
Build Requirements:
iOS SDK 4.0
Runtime Requirements:
iPhone OS 3.2 or later and iPhone 3GS or iPhone 4 Requires a device with a magnetometer. This sample will run in the Simulator but only one magnetic measurement will be received.

This application implements a Teslameter, a magnetic field detector. It displays the raw x, y, and z magnetometer values, a plotted history of those values, and a computed magnitude (size or strength) of the magnetic field.

The use of the Core Location API for getting "heading" data is contained in the TeslameterViewController class. It creates a CLLocationManager object and uses it to get heading by invoking -[CLLocationManager startUpdatingHeading]. It implements the CLLocationManagerDelegate APIs for receiving heading and updates its user interface accordingly.