Health · CGM

Blood sugar widget

The last sensor value from your own Nightscout site, on your Android home screen — refreshed on your own interval.

Preview · sample data

The source

Nightscout already holds the numbers; what it does not do is sit on your home screen. Zync reads the same entries endpoint and prints the latest sensor value, so a glance is enough — without unlocking the phone and opening a follower app.

your-nightscout-site

https://YOUR-SITE/api/v1/entries.json?count=1

The result format

Pick the fields you want by their JSON path, and embed them between braces. A literal \n breaks the line; everything else is copied as written.

Response: https://YOUR-SITE/api/v1/entries.json?count=1

{0.sgv} {0.direction | Flat: →, SingleUp: ↑, SingleDown: ↓, FortyFiveUp: ↗, FortyFiveDown: ↘, DoubleUp: ↑↑, DoubleDown: ↓↓}

112 ↗

Every rule this language supports — paths, indexes, math, optional values, lists — is in the mapping docs.

At a glance

Your latest Nightscout reading on the home screen.

The trend is a map

The braces hold a map: direction → symbol. Add a pair for any value your sensor reports, and an unmapped or missing one prints an em dash instead of guessing.

Add the unit when you need it

Nightscout stores mg/dL — write {0.sgv} mg/dL in front of the trend if the unit belongs on the widget. Reading in mmol/L? Divide inside the format instead of editing the source.

Refresh sensibly

A sensor updates every few minutes; a five-minute widget interval is enough and keeps the request rate low.

Nightscout returns an array, so the newest entry is index 0. If your site is protected, add its access token as a request header under Advanced Options — and never paste a token into a tracker you share with the community. Zync is not a medical device and does not raise alarms; treat the widget as a convenience view of data you already monitor.

Keep reading

All use cases

Your own data widget Any private JSON endpoint — a sensor, a dashboard, a script you wrote.Website monitor widget The health of your endpoint, or the last check from your uptime provider. The widget on your home screen Pinning, resizing, refresh intervals and what the error marker means.