Fitness trackers have become a popular piece of consumer electronic equipment, with a range of models from a variety of manufacturers. Many of these commercial offerings, however, leave the consumer with the prospect of their data being drawn off to a cloud server and sold to the highest bidder, trading convenience for a loss of privacy. If only there were a fitness tracker offering complete control!
The OpenHAK is an open-source fitness tracker in a 3D printed wristwatch case that measures your heart rate and counts your steps, offering the resultant data for you to collect via Bluetooth. At its heart is a Sparkfun Simblee module, with heart rate sensing through a Maxim MAX30101 and step counting .by a Bocsh BMI160. It’s designed for expandability from the start with a header bringing out useful interface lines. In the prototype, they’ve used this to support a small OLED display. The result is a fitness tracker watch that may not match some of the well-known proprietary devices, but which remains completely open and probably costs a lot less too.
We’ve seen quite a few fitness tracker apps over the years, including a conversion to an EEG, and custom firmware for some commercial trackers.
Nice to see more Open Source Projects on fitness tracker devices, as mentioned in the article i already published a custom firmware for the I6HRC Fitness tracker, since then things have changed, thanks to fanoush (https://github.com/fanoush/ds-d6) who has found the 5$ D6 fitness Tracker from desay with the nRF52832 core i was Able to also make a arduino custom firmware for this tracker and make an Android app to update the Tracker without opening via DFU here are some video’s about that:
Android Flasher for nRF52 devices:
https://www.youtube.com/watch?v=LDGxU-i7z7U
Heartrate Sensor demo:
https://www.youtube.com/watch?v=SQsxk_iKhg8
Custom notification app for Android:
https://www.youtube.com/watch?v=ODRWm9IqufA
Thankfully fanoush made Espruino running on the Device, so directly programming via the Browser and upload via BLE.
Would be nice to have this in a box preassembled. I really don’t like giving away my training methods, or locations, but would like to keep track of my heartrate and oxygen levels.
For me the number of steps don’t matter. The heartrate and oxygen levels are all that matters for cardio.
Sparkfun seems to have dropped most of the Simblee modules.
Simblee is EOL.
(Speaking as an ex-ams app support eng. It was just an nRF51822 repackaged into an LGA. Most code should port across to a standard chip – Anything written with the Simblee core for Arduino should compile for a generic nRF target with little trouble.)
Since you’re a professional writer on a commercial platform, you might not know that proof-reading helps prevent publishing errors such as “step counting .by a Bocsh BMI160” (even the Firefox spell-checker catches one).