• This thread is first google hit for "espruino fitness tracker" so I am just letting know here for anyone searching for it that there is now a nRF52832 based fitness tracker that works fine with Espruino. It is the DS-D6 mentioned in the espruino on you watch thread.

    The procedure of update from original firmware to Espruino needs only using 3.3V TTL serial port connected to usb pins of DS-D6 and is relatively easy.
    More info here https://github.com/fanoush/ds-d6/

    It is currently easy to buy it e.g. from Gearbest for $9.99, the manufacturer is Desay as also mentioned in FCC documents https://fccid.io/2AEMN-D6

    However as it is sold for quite some time already (at least Gearbest has first user reviews for it starting Nov 2017) it may become obsolete any time soon.

    I got few of them for personal use so I will maintain current Espruino builds for it for as long as practical.


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