AccelMeter on iPhone / iPod Touch

Smoothly visualize and measure the current acceleration in real-time. It can be used on earth, on moon or in orbit (where relative would be equal to absolute mode - please prove) to visualize the direction and strength of the gravitation - or simply at home to measure the g-forces you reach while shaking your phone - however be warned if you tend to get to the limits! :-). A fun application is to place the iPhone/iPod steady in your car (or any other moving vehicle), go to relative mode, zero it once when you are standing and then see the current g-forces in effect while you drive (e.g. what g-force does your car reach when you accelerate?).

User Manual

The red buttons switches between the two main modes (Acceleration and Acceleration-Relative). The yellow button function depends on the main mode (4 sub-modes for Acceleration and Reset in Acceleration-Relative Mode). The yellow dot displays the sensor location of the accelerometer on screen.

Acceleration Main Mode

Absolute Mode (Initial): Displays the reverse acceleration of the iPhone (1g up when hold steady). The digital indicator shows the acceleration in g. We will add the option to reverse this arrow in this mode with the next update of this software.

Z-Rotation: The arrow will display the rotation around the Z-Axis of the iPhone. The digital indicator shows the angle numerically (-180° - +180°) where 0° is in the center. A way to calibrate will be added with one of the next updates, so you could use this as a level.

Y-Rotation: The arrow will display the rotation around the Y-Axis of the iPhone. The digital indicator shows the angle numerically (-180° - +180°) where 0° is in the center. A way to calibrate will be added with one of the next updates, so you could use this as a level.

X-Rotation: The arrow will display the rotation around the X-Axis of the iPhone. The digital indicator shows the angle numerically (-180° - +180°) where 0° is in the center. A way to calibrate will be added with one of the next updates, so you could use this as a level.

Acceleration Relative Main Mode

Relative Mode: This mode shows the relative strength (absolute minus compensation vector) of the acceleration. When the device is rotated in any direction the compensation vector has to be reset by pressing the yellow button when holding steady.

Known Issues in Version 1.0 (both AccelMeter or MagnetMeter if not specified further)

• In Relative Acceleration Mode the arrow disappears after some time.

Final notes

For recreational use only. However it CAN (!) be very accurate. The measurement is performed as good as possible (we try our best) by using the inbuilt accelerometer and magnetometer to their limits. The range of the accelerometer typically has a max of ±3g (~4.2g displayed here if combined) and each magnetometer usually recalibrates internally when over ±120μT in one axis. However, tell us your experience!