SensorTrail: Data Logger

SensorTrail records readings from your phone's motion, light, and magnetic sensors and shows them on a live chart, ready for experiments, classes, and hobby projects.

• Choose the accelerometer, gyroscope, ambient light, proximity, or magnetic field sensor when your device has it
• Watch live X, Y, and Z traces on one chart, with the combined magnitude shown up front
• Every reading is timestamped and saved with the sensor's unit
• Rotate the phone mid-capture and recording carries on
• Export the capture as a CSV file named by sensor and start time, in a folder you choose
• Standard captures run up to 30 minutes or 9,000 samples, at up to five readings per second
• Vibration mode for the accelerometer and gyroscope: capture at 50, 100 or 200 Hz, as far as your phone can deliver
• See the dominant frequency and a frequency spectrum from the newest samples of the axis you choose, plus RMS, peak amplitude and the sample rate your phone really delivered
• Vibration captures run up to 10 minutes or 60,000 samples, with the screen kept on

Only the latest capture is kept; the app asks before replacing it, so you can export it first.

Readings are what your phone reports, not calibrated measurements or a safety assessment.