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ANT+ Sensor readings Garmin vivoactive 4

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Total Posts: 3

Joined 2021-06-30

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Hello,

with ANT+ I want to read out sensors values such as heart rate sensor and temperature sensor out of e.g. an Garmin Vivoactive 4 etc. I experimented with SimulANT+ and two ANT+-m USB Sticks and can display data from simulated sensors. In Channel Parameters i have to set up a Device Number, Device Type and a Transmission Type. My question now is, i don't know this IDs from my Garmin Watch so how can I dispay these values?



     
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Total Posts: 370

Joined 2012-06-27

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Garmin watches do not support broadcasting temperature over ANT+. They do support HR if you enable it by going to the broadcast HR page in the watch settings. https://www8.garmin.com/manuals/webhelp/vivoactive4_4S/EN-US/GUID-8EC8B7FE-2AC2-46E9-94FC-06416FF1E2ED.html

The device number will be the lower 16 bits of the esn in the about page for the watch. The transmission type will be 0x01 | ( bits 16 to 19 of the esn << 4). ie the extended device number is the lower 20 bits of the esn from the about page.      

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Ian Haigh

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Total Posts: 3

Joined 2021-06-30

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Hello haighi,

thanks for your answer! I managed to get the HR out of my Garmin watch and received it on a Raspberry Pi. So the Watch ist broadcasting as you described it in your post. Is there a chance to request sensor data e.g. the temperature over ANT+ because the watch isn't boradcasting this values as you said?      
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Total Posts: 370

Joined 2012-06-27

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You can submit a request to Garmin through the product forum, but it is unlikely to be added. Garmin has an environmental temperature sensor that is ANT+ https://buy.garmin.com/en-US/US/p/107335/pn/010-11092-30 This .is more accurate b/c the watch temperature is affected by the heat from the wrist.      

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Ian Haigh

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Joined 2021-06-30

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Hi haighi,
do you know if its possible to get the Gamin .fit files (which includes my sensor data) out of my watch using ANT FS? I tried with the openant python library but no connection to my watch. i know the fifoactive 4 is not avaiable in the compliant ANT-FS Devices listed there (https://github.com/Tigge/openant) but maybe its possible though.      
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New Garmin watches do not support ANT-FS file downloads. They use transfers over USB for improved transfer time.      

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Ian Haigh