What is the Nightscout project?

Nightscout (CGM in the Cloud) is an open source, DIY project that allows real time access to a Dexcom G4 CGM from web browsers via smartphones, computers, tablets, and the Pebble smartwatch. The goal of the project is to allow remote monitoring of the T1D’s glucose level using existing monitoring devices.

Are you looking for technical support for your existing Nightscout installation or have questions about your existing Nightscout installation?  Please visit the CGM in the Cloud group on Facebook for help!  For first-time installation instructions, keep reading here!



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Note: There is no support or any warranty of any kind. The quality and performance of the project is with you if you choose to use it. This is a project that was created and is supported completely by volunteers.

How Does It Work?

The technology is rather simple: your Dexcom receiver continues to work as it always has by reading the glucose level of the T1D who is wearing the sensor / transmitter. The Nightscout system allows you to attach a device to the Dexcom receiver that transmits the glucose readings to the internet, where any web-connected device can view the numbers. It’s that simple.

This image from the Wall Street Journal article, “Citizen Hackers Tinker with Medical Devices,” illustrates the entire system. Click on it for a larger view.

Image Courtesy of Wall Street Journal, Published on line, Friday, Sept. 26, 2014

Image Courtesy of Wall Street Journal. Published on line, Friday, Sept. 26, 2014

What Does It Look Like?

This is the system that the T1D will continue to keep with them. It is referred to as the “Rig” throughout this guide. There are countless configurations of the cables that connect the Dexcom receiver to the uploader device.

The combination of the smartphone + Dexcom receiver allows data to be sent to the internet. This is how you will be able to see the glucose values of the person using the Dexcom receiver/Rig.

During the install process several systems need to be synchronized using configuration menus in several different applications. These systems are required for the system to work. Once those systems are installed and synchronized, your personal website ultimately displays the data from the cloud using an internet browser. Almost any device that can access the internet will be able to see this website.

With these components, the CGM levels can be seen from anywhere in the world.

The website works on many mobile devices such as tablets, laptops, Mac devices, and any other web-connected device.



 What’s It Like In Action?

Nightscout- CGM in the Cloud from Madeline Cobbler on Vimeo.

What Does It Cost?

The minimum cost for the initial setup is approximately $100 for a fully working system (click here for details). Some users have been able to find components on sale and have setup for about $75. If you choose to add optional accessories to customize your Rig, you can spend much more, from $50 more to $350 or more. The on-going monthly cost is anywhere from $0 (free) to much more, again, depending upon the setup options you choose.


What Do I Do Now?

The sole purpose of your specific website is to display the data. Due to the caveats mentioned and for many other reasons, it is important to not rely on this for therapy .

Reading through the step by step instructions before you start will help prepare you for putting everything together and learning how to use the system.

Want more information?

Step by Step Install Guide



All we ask is that you pay it forward because #wearenotwaiting.



All information, thought, and code described here is intended for informational and educational purposes only. Use of code from github.com is without warranty or support of any kind.
Each element of the system can fail at any time rendering the system unusable. There is no password protected privacy or security provided by these tools; all data you upload can be available for anyone on the internet to read if they have your specific URL to view your data. Please review the LICENSE found within each repository for further details. This is not a project of the Dexcom company. Nightscout has no affiliation with Dexcom or any other company, service or product mentioned anywhere on this website.
Do not use any of the Nightscout information or code to make medical decisions.