Sensor Logger

Kelvin Tsz Hei Choi

In-app purchases

About this app

Sensor Logger collects, records and displays data from a wide range of sensors on your phone & Wear OS watches — including accelerometer, gyroscope, GPS, audio, camera and bluetooth devices. You can also log device properties such as screen brightness, battery level and network state. An intuitive interface allows you to select your desired sensors and preview them live. A tap of a button initiates the recording function, which works even when the app is in the background. You can view and manage recordings within the app via interactive plots. The export functionality conveniently outputs your recordings in a variety of formats, including Zipped CSV, JSON, Excel, KML and SQLite. For advanced use cases, you may also stream data via HTTP or MQTT during a recording session, resample and aggregate measurements from multiple sensors, and create Studies to collect recordings from other Sensor Logger users with ease. Sensor Logger is specifically designed for researchers, educators, and anyone with an interest in collecting or monitoring sensor data on their smartphone. It serves as a toolbox for exploring various fields, including physics, science, technology, engineering, and mathematics (STEM).

Main Features:
- Comprehensive Sensor Support
- One-Tap Logging
- Background Recording
- Recordings on Interactive Plots
- Stream Data Real-time via HTTP / MQTT
- Intelligent, Custom Rule Engine.
- Zipped CSV, JSON, Excel, KML and SQLite exports
- Resample and Aggregate Measurements
- Enable & Disable Specific Sensors
- Scan & Log Nearby Bluetooth Devices
- Add Timestamp Synchronised Annotations During Recording
- Adjust Sampling Frequency for Sensor Groups
- Custom Recording Workflow
- Raw and Calibrated Measurements Available
- Live Plots and Readings for Sensors
- Organise, Sort and Filter Recordings
- Control and Track Recording Sessions From Watch
- Log Measurements From Your Watch
- Bulk Export & Delete Recordings
- Free Resources to Help You Analyse Your Data
- Ad-Free
- Data Stays On-Device and 100% Private
- Create and Share Dashboard-style, Data-driven Stories using your recordings, hosted online.

Supported Measurements (if available):
- Device Acceleration (Accelerometer; Raw & Calibrated), G-Force
- Gravity Vector (Accelerometer)
- Device Rotation Rate (Gyroscope)
- Device Orientation (Gyroscope; Raw & Calibrated)
- Magnetic Field (Magnetometer; Raw & Calibrated)
- Compass
- Barometric Altitude (Barometer) / Atmospheric Pressure
- GPS: Altitude, Speed, Heading, Latitude, Longitude
- Audio (Microphone)
- Loudness (Microphone) / Sound Meter
- Camera Images (Front & Back, Foreground)
- Camera Video (Front & Back, Foreground)
- Pedometer
- Motion Activity
- Light Sensor
- Annotations (Timestamp and optional accompanying text comment)
- Device battery level and state
- Device screen brightness level
- Nearby Bluetooth devices (All advertised data)
- Network
- Heart Rate (Wear OS Watches)
- Wrist Motion (Wear OS Watches)
- Watch Location (Wear OS Watches)
- Watch Barometer (Wear OS Watches)

Optional Paid Features (Plus & Pro):
- No limitations on the number of stored recordings
- Additional export formats — Excel, KML and SQLite
- Additional timestamp formats
- Checkpoint for long recordings
- Combined CSV export — combine, resample and aggregate measurements from multiple sensors
- Customise recording workflow
- Advanced sensor configurations
- Custom naming templates
- Theme and icon customisations
- Unlimited number of rules
- Unlimited number of annotation presets
- Unlimited Bluetooth beacons and no limit on the minimum RSSI
- Create larger Studies with more participants
- More allocated storage for Studies using Sensor Logger Cloud
- Unlimited number of simultaneously toggled Bluetooth sensors and no limit on the minimum signal strength
- Email support (Pro & Ultimate only)
- Advanced Study customisation, including creating custom accompanying questionnaires and custom Study ID (Ultimate only)

Ratings and reviews

Overall great app. Using it to collect some preliminary data before we build out something more specific to our use case. The biggest downside has been trying to interpret the exports pushed to our server. Some of the data points aren't documented so we don't know what they are (for example "accuracy" comes over as 1 or 3 - but we have no idea what either means). The app is great, but there are a few holes in documentation so we can identify what we're looking at.

truly a gift. not everything is free but a lot is. The update makes me giggle they love their users till beyond. That's what I believe.

works well. is there a stand alone watch app? the watch app seems only to start the recording on the phone...

What’s new

- You can now configure Studies to automatically delete the local copy of the recording from participant’s device upon a successful upload.
- Improvements to editing geo-fences in the Rule Engine.
- Support for playing a tone in the Rule Engine.
- Support for Trigger Mode in the Rule Engine — either trigger every time the condition is met, or when the condition is met for the first time in a sequence.