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# Dexcom G6 and ONE

## Basics first

-   Follow general CGM hygiene and setting sensor recommendation [here](../CompatibleCgms/GeneralCGMRecommendation.md).

## General hints for looping with G6 and ONE

- Recent transmitters are called Firefly. Sensors cannot be restarted without removing the transmitter, which itself cannot be reset, they also do not generate raw data.

- If you are restarting sensors, ensure you are ready to calibrate and keep an eye on variation.

- Pre-soaking of the G6/ONE with factory calibration is likely to give variation in results. If you do pre-soak, then to get best results, you will probably need to calibrate the sensor.

Read more in the [article](https://www.diabettech.com/artificial-pancreas/diy-looping-and-cgm/) published by Tim Street at [www.diabettech.com](https://www.diabettech.com).

## If using G6 or ONE with xDrip+

- If you are using a recent (Firefly) transmitter, preemptive restarts are **ignored**.
- If you are using a modded transmitter you do **not need** to use preemptive restarts.
-   If you are using an old rebatteried transmitter, the safest thing to do is **disable** [preemptive restarts](https://navid200.github.io/xDrip/docs/Preemptive-Restart.html). Though, in this case you will have to use the G6 in non-[native mode](https://navid200.github.io/xDrip/docs/Native-Algorithm.html) (which is unadvisable as it disables factory calibration and doesn't filter noisy readings), or else the sensor will stop after 10 days.
-   The Dexcom G6 and ONE transmitters can simultaneously be connected to the Dexcom receiver (or alternatively the t:slim pump) and one app on your phone.
-   When using xDrip+ as receiver uninstall the Dexcom app first. **You cannot connect xDrip+ and Dexcom app with the transmitter at the same time!**
-   If you need Clarity and want to profit from xDrip+ alarms use the [BYODA](#DexcomG6-if-using-g6-with-build-your-own-dexcom-app) (only G6) with local broadcast to xDrip+.
-   You can also use xDrip+ as a companion app of the official Dexcom app, but you might experience delays in BG readings.
-   If not already set up, download [xDrip+](https://github.com/NightscoutFoundation/xDrip) and follow the instructions on [xDrip+ settings page](../CompatibleCgms/xDrip.md).
-   Select xDrip+ in in [ConfigBuilder, BG Source](#Config-Builder-bg-source).

- Adjust settings in xDrip+ according to [xDrip+ settings page](../CompatibleCgms/xDrip.md)

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## If using G6 with Build Your Own Dexcom App

-   [Build Your Own Dexcom App](https://docs.google.com/forms/d/e/1FAIpQLScD76G0Y-BlL4tZljaFkjlwuqhT83QlFM5v6ZEfO7gCU98iJQ/viewform?fbzx=2196386787609383750) (BYODA) supports local broadcast to AAPS and/or xDrip+ (not for G5/ONE/G7 sensors!)

![BYODA broadcast options](../images/BYODA.png)

-   This app lets you use your Dexcom G6 with any Android smartphone.
-   Uninstall the original Dexcom app or patched Dexcom app if you used one of those previously (**do not stop** the currently running sensor)
-   Install the downloaded apk
-   Enter sensor code and transmitter serial no. in patched app.
-   In phone settings go to apps > Dexcom G6 > permissions > additional permissions and press 'Access Dexcom app'.
-   After short time BYODA should pick-up transmitter signal.

### Settings for AAPS

-   Select 'Dexcom App (patched)' in in [ConfigBuilder, BG Source](#Config-Builder-bg-source).

-   If you don't receive any values select any other data source, then re-select 'Dexcom App (patched)' to trigger the demand for permissions to establish the connection between AAPS and BYODA-broadcast.

### Settings for xDrip+

-   Select '640G/Eversense' as data source.
-   Command 'start sensor' must be performed in xDrip+ in order to receive values. This will not affect your current sensor controlled by Build Your Own Dexcom App.


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## Troubleshooting G6 and ONE

### Dexcom G6/ONE specific troubleshooting

-   Scroll down to **Troubleshooting** [here](https://navid200.github.io/xDrip/docs/Dexcom_page.html).

### General troubleshooting

General Troubleshooting for CGMs can be found [here](#general-cgm-troubleshooting).

### New transmitter with running sensor

If you happen to change transmitter during a running sensor session you might try to remove the transmitter without damaging the sensor mount. A video can be found [here](https://navid200.github.io/xDrip/docs/Remove-transmitter.html). If you opt for [this solution](https://youtu.be/tx-kTsrkNUM) instead, you must be careful to avoid [damaging sensor contacts](https://navid200.github.io/xDrip/docs/Petroleum-jelly-in-Dexcom-G6-Sensor.html) with the strip.