NEWS:

Juggluco can now send values to Gadgetbridge. Se here for a discussion in its repo

glucose-to-weather

An info and link collector where to discuss about the idea of using weather info on smartwatches to display glucose values.

1. @SaschaH42 fake weather provider for gadgetbridge

2. Discussion in GadgetBridge repo

3. FreeThree and some watchfaces - discussion in German

4. Discussion in Watchdrip repo

For testing purposes only! Do not rely on this method for glucose monitoring or treatment decisions!

Proof of concept:

Playing with @Sascha42 's application I've managed to display glucose values to an Amazfit 5 using xDrip, Gadgetbridge and a fake weather provider.

All I had to do was to patch two files in ist source code: GadgetBridgeAPI.java used to manage info from xDrip webserver, and FirsFragment.java which is used to decide what to send to the watch.

Finally I had to create an appropriate watchface. I used a minimalistic watchface created by netrunner.exe and added some elements from @bigdigital's watchdrip project, and tweaked elements position.

As for now I used this scheme:

• Humidity ( range 0-254 ) as current glucose value. When the value is higher a 0 is displayed.
• Weather icons as trend arrows ( there are 26 differents icons, so with proper images this value could be used for diplay hours )
• Current temperature ( range -128 to 127 ) as bg delta
• Max ( day ) temperature as last reading hour
• Min ( night ) temp as last reading minute
• Wind speed is unused. Could be used as another digit for bg, or as trend arrow so to let weather icons for another info ( eg hours ).
• UV is still not implemented by gadgetbridge api, so it is not usable for now.

Here a random numbers example of the watchface:

Current limitations:

• No BG alarms. This is maybe the bigger missing feature. Only standard notification could be used for xDrip on the band ( eg as message notification and not as alarms and calls ).
• No graph. It won't be possible anytime given the nature of the approach.
• You cannot have weather. There is probably a way to display at least something ( eg current temp ) by better managing digits on the watchface.
• As int values are used for hours and minutes, single digit hours/minutes will be displayed as single digits.
• Watchface has bad fonts and sometimes values ( eg HH:mm) overlaps, so it has to be tweaked
• There are probably tons of bugs which will display in the worst time

Status of other bands:

Unknown. With the Amazfit 5 there are no reality checks on temperature and humidity, you can send a minTemp value which is bigger than a maxTemp one, or you can set humidity to 250%. Others models needs to be tested, for those which this does not apply it is trickier to find a working arrangement of weather values on the screen, but it could be done. Mi band5 is the next natural tester, as it is very similar to amazfit5 and could even share the same wacthface. Then mi band6 and mi band 7, which in case will require a new watchface.

For testing purposes I set weather values to constants in GadgetBridgeAPI.java so to test limits.

Test procedure:

• in xDrip settings-> interapps settings enable webservice
• install Gadgetbridge and connect your band/watch
• Upload the watchface ( just open the file and Gadgebridge will manage it )
• Build the application from @sasha42 source ( link is provided in the firs section ) using GadgetbridgeAPI.java and FirstFragment.java that you can find in this repo.
• install the xDrip-Gb-gateway app and open it, press to get xDrip values
• wait a few second for the values to be displayed on the watch ( the app search for new values every 20 seconds )

Useful resources:

• Watch faces creator for mi band 5-6 ( useful as it has a gui which allows to drag elements and set specific values to test the rendering )
• Watchface creator for mi band 5-6-7. It can run even on locale. More stable than the first one, has a better interface to diplay and load images.
• How to build you app from source