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Ollee Watch: Turn your classic Casio watch into a smartwatch

olleewatch.com

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Re: Ollee Watch: Turn your classic Casio watch into a smartwatch

#2
The heart rate is calculated manually by counting 20 heartbeats and using the timer.

Here are a couple (and I recall one other project but I can't remember the name of it right now) open source alternatives for those who aren't trying to fw a proprietary app/closed source system.

https://github.com/joeycastillo/Sensor-Watch https://github.com/PegorK/F91_Kepler