Why does my new Mark II say "Please Connect Structure Sensor"? It IS connected!

There are multiple reasons why you may be experiencing connectivity issues.

Generally speaking, the best practice for initializing your sensor is to launch your app first with the sensor already disconnected. When prompted, connect your sensor. Initialization may take up to five seconds.

Didn't work?

There are other reasons this may be the case.


Your firmware is not up to date.

With the release of firmware version 1.0 and SDK 0.12, virtually all connectivity issues were solved. To make sure your firmware is up to date, please follow these steps:

  1. Download the Structure app from the App Store.
  2. Disconnect your sensor and launch Structure with the sensor disconnected.
  3. Connect your sensor when prompted.
  4. Wait. Sensor initialization can take 5 seconds or so.

    screenshot of app showing the sensor initializing

  5. Once initialized, tap the "i" icon in the upper right corner.screenshot of Structure app needing updated firmware
  6. If your sensor has a firmware update available, you will see this blue banner (Note: if you are doing this on an iPhone, you may need to scroll down to see the banner).Structure App's sensor information modal
  7. Tap the blue banner to begin the firmware update process.screenshot of sensor firmware being updated

Please note, you will need to update your firmware quickly, as the longer the sensor is running, the more memory it will consume. If your sensor runs out of memory, you will need to unplug the sensor to clear the memory and try again.


Your apps are not up to date.

This is coupled with the firmware update--apps that are still running SDK 0.11 will continue to have connectivity problems. All of our first-party apps are built on the current SDK, and as such, you simply need to make sure to update your apps. 

To manually update your apps, please follow these instructions by Apple: https://support.apple.com/en-us/HT202180

If you are using a third-party app, we still recommend checking if there is an update. If not, please contact that specific developer for support.


Your app has not been updated to work with Mark II.

Apps that have not been upgraded to specifically work with Mark II will ask to connect to Structure Sensor or to ask you to charge your Structure Sensor. For a list of updated apps, please check out this article.

If you have a particular app that you require that is not on the list, we ask that you contact that developer directly for an estimated availability date.


Your sensor may need to charge.

Your sensor may have initialization trouble if the battery is too low. Please make sure to fully charge your sensor before use.


You may have a cable issue.

If you have tried everything else and it still seems as though your sensor will not initialize no matter what, there may be an issue with the cable.

If you have another cable available to test with, we suggest trying the above steps with that cable.

If you purchased your cable within the last 90 days, you may be eligible for a warranty cable replacement. Please email support for more information. 

If you purchased your cable outside of the 90-day mark, it is no longer eligible for a warranty replacement. Instead, replacement cables may be purchased from our accessories page.


None of these work?

Please email support for further options.

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