Following-up from my previous look at magnetometers http://blog.davidesp.com/archives/646.
I have an iPhone 4 (ordinaire) running iOS 4. Apparently it has a magnetometer, and a number of Apps to alarm, display and log data from it are available. Hey, it’s getting towards being a “Tricorder” (of Star Trek fame)…
The ones I have tried are:
- MAD – Magnetic Anomaly Detector
- When I run it, I tend to click (enable) all three buttons (they each display their current mode, not switch effect).
- If I’m simply in a room, I tend to drop the threshold (slider) to half or a quarter. Otherwise if driving I leave it Full.
- The Log is simply a text-pane, one can Select/Copy etc; unfortunately the log gets cleared when you exit the app.
- EMF Detector
- Has an “analog meter” style of display and audio tone (optional, volume-controllable).
- Maybe useful for tracing wires etc.? But how reliable? In my house it ignored a light-switch and around it but “got excited” over certain parts of window frames and metal radiators (certain corners only) for reasons I don’t understand.
- XSensor
- Displays and optionally logs/emails data from several of the sensors on iPhone: Magnetics, Accelerations, GPS, Gyros.
- Fun for finding out about the sensors, their capabilities, their noise-issues etc.
- Accelerometer Data (“ordinaire” or Pro)
- Data can be raw or Low-Pass filtered (for absolute gravity and orientation) or High-Pass (monitoring for their changes).
- Accelerometer data can be streamed (via UDP) to computer or logged to CSV file.
- The Pro version saves to Flash, instead of just RAM, hence greater logging capacity.
- Sensor Kinetics
- Plain sensors: Accelerometer, Gyroscope, Magnetometer
- Derived sensors: Linear Acceleration, Gravity, Attitude.
- Nice graphics (clarity as well as entertainment value)
- ?