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Polar Sensor Logger

This application can be used to log raw bio signals from the Polar H10 and OH1 sensors. It uses Polar SDK (htt...

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This application can be used to log raw bio signals from the Polar H10 and OH1 sensors. It uses Polar SDK (https://www.polar.com/en/developers/sdk) to connect sensors.

Sensor requirements:
- H10 firmware 3.0.35 or later
- OH1 firmware 2.0.8 or later

Permissions:
- Device location: In order to scan bluetooth devices, device location is required by the Android system
- Read/Write files: Samples are saved to temporary files and then emailed, etc.

This application was made for my own purposes and it is not an official Polar app nor supported by Polar.

Here are the most frequently asked questions about the application:

Q: What is the timestamp format?
A: Timestamp format is nanoseconds and the epoch is 1.1.2000.

Q: Why nanoseconds?
A: Ask from Polar :)

Q: What are the extra columns in HR data?
A: They are RR-intervals in milliseconds.

Q: Why there are sometimes 0-4 RR-intervals?
A: Bluetooth exchanges data around 1 s intervals and if your heart rate is around 60 bpm, then almost every RR-interval hits between data transmission. If you have heartrate eg. 40, then your RR-interval is over 1s => not every BLE packet contain RR-interval. Then if your heartrate is eg. 180, then there is at least two RR-intervals in BLE packet.

Q: What is the ECG sampling frequency?
A: It is around 130 Hz.

Q: What does ECG, ACC, PPG, PPI mean?
A: ECG = Electrocardiography (https://en.wikipedia.org/wiki/Electrocardiography), Acc = Accelerometer, PPG = Photoplethysmogram (https://en.wikipedia.org/wiki/Photoplethysmograph), PPI = Pulse-to-Pulse Interval

Q: What does "Marker"-button do?
A: Marker button will generate a marker file. Marker file will hold timestamps when the marker is started and stopped. You can use the marker to mark some events during the measurement.

If you have more questions, please drop me an email!

Last update

June 9, 2020

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