CYGM is a small screen that shows the reading your CGM already shares. Put it on a nightstand, a desk or a kitchen counter, and check the number with a glance instead of a phone.
A working copy of the CYGM+ screen, with sample readings and your own clock. Try a reading to see what changes.
How it works
CYGM never touches the sensor. It signs in to your CGM's sharing service as a follower, the same way a family member's phone does, and puts the number on a screen of its own.
Measures glucose, every few minutes.
Your phone or receiver gets the reading and shares it.
Dexcom Share, LibreLinkUp or your Nightscout site.
Checks about every 90 seconds and shows it on the screen.
Which CGM do you use?
Made for
See the number without unlocking a phone or switching on a light. CYGM signs in as a follower, so your child's own CGM app keeps working exactly as it did.
No soldering and no special tools. Print the case in your favourite colour, plug in the board, and install the software from a web browser. Then pick how your alarms sound.
With the family's permission, CYGM signs in as one more follower. Staff can see a student's number at a glance without carrying a phone around, and the student's own phone and app don't change.
CYGM is an open-source secondary display. It reads the same shared data a follower app receives. It doesn't measure glucose, can't dose insulin, and isn't FDA-cleared.
Two sizes
Both work with the same CGMs and the same kinds of alarms. CYGM+ is the new one, with a bigger, sharper screen. CYGM is the original, and the cheapest way in.
A 3.5-inch screen that's sharper and smoother, a battery charger built in, and a speaker that can read you the weather.
About $56in parts, plus a printed case
The original 2.8-inch display, with a night face, 28 alarm tones and optional logging to an SD card.
About $40in parts, plus a printed case
Screens are shown at their true size relative to each other.
| Feature | CYGM+ | CYGM |
|---|---|---|
| Screen | 3.5″ capacitive touch, 480 × 320 | 2.8″ capacitive touch, 320 × 240 |
| Board | JC3248W535C (ESP32-S3) | JC2432W328C (ESP32) |
| Works with | Dexcom Share, LibreLinkUp, Nightscout | Dexcom Share, LibreLinkUp, Nightscout |
| Alarms | Urgent high, high, low, urgent low, predicted low, no data, quiet hours | Four tiers, 28 tones, quiet hours, escalating volume |
| Battery | Optional 3000 mAh, charger built in | Optional |
| Speaker | Optional 3 W, with spoken weather | Optional |
| Updates over Wi-Fi | Yes | Yes |
| Install | From this site, in Chrome or Edge | From this site, in Chrome or Edge |
| Parts | About $56 | About $40 |
| Status | Beta 2.0.25 | Release, v1.1.10 |
Get started
One touchscreen board does nearly everything. A battery and a speaker are optional, and the case prints on any home 3D printer.
Plug the board into a computer, open this site in Chrome or Edge and press Install. Nothing to download. Later updates arrive over Wi-Fi.
The screen walks you through Wi-Fi, your location and your CGM. Set your alarms, and it's ready for the nightstand.
CYGM+ build guide coming soon. You can buy the parts and print the case today, so you're ready the day it lands.
CYGM+ parts and caseAlso here: USB cable test Card viewer and tools Beta program Gallery
All checked in during the last half hour, from 26 cities around the world.
Grouped by city, never by device. A city appears when at least one device there has checked in within the last half hour. Placement is approximate.
Privacy
Why this exists
When my step-daughter was diagnosed with type 1 diabetes, the number we needed most lived on a phone in another room. The screens you could buy were expensive, closed, and usually came with a subscription. So I made the opposite.
Carl BrothersBuilt CYGM for his own family · About me
Part of #WeAreNotWaiting, the community of people with diabetes and their families building their own tools. Read what other people have built, or meet the people who helped.