A Logmore QR code is capable of holding a lot of data, but long, data-intensive use may fill a QR code more often than it is scanned. In this article, you will learn how to can scan history QR codes and upload missing data to Logmore Cloud.
Quick guide to scanning history QR codes
- Click the button on the logger twice.
The screen updates and History #01 are shown on the screen above the QR code.
Scan this history QR code with your smartphone.
Click the link that appears on your screen after scanning. Now the data from this history QR code is uploaded to the Cloud.
Click the multi-use button once to access the next history code, History #02.
Scan the second code and click the link. Continue until all history QR codes are scanned and uploaded to the Cloud.
When there are no more history QR codes left, you will see the End of history. Returning live screen. Click the button once to return to the normal view. All missing data is uploaded.
Download the guide attached for more details or check the detailed instructions below.
When is it time to check for History QR codes?
How to find out that you have gaps in your data? In Logmore Cloud, check the Mission's individual page and look for:
- gaps in measurements
- a message saying Incomplete data
The data is not lost when a QR code is filled. Instead, old, "full" QR codes are safely stored as history QR codes on the data logger.
Note that the incomplete data issue might also occur if the logger itself (not the external probe) was stored in low temperatures (below +2°C). Being in cold temperatures might have prevented the screen to show the most recent QR code. You need to warm the logger and click the button to update the screen. Check the guide here.
Prevent History QR codes from generating
Regular scanning of data loggers prevents history QR codes from generating. You can roughly estimate how much data fits into one QR code before it's filled in our Calculator. This information helps you estimate how often you should scan your loggers and plan your operations accordingly.
- Go to https://web.logmore.com/batterycalc
- In Settings, fill in the measurement intervals depending on your logger's sensors and monitoring needs.
- In Measurements, the number of measurements is prefilled to 1700.
- Below, you will see the estimated number of measurements per day and the number of days before a history QR code is generated with the current settings.
- Estimate how the change in measurement intervals affects the battery life and the history QR codes when planning your operations.
For the instructions on changing the measurement interval of the logger, follow this guide on logger configuration.
💡 The QR logger keeps logging even outside the "normal operation view". You can browse the historical QRs without worrying about losing data.
Once you've browsed through all the historical QR codes on your QR logger, you'll run into the history end screen “End of history. Returning live.” If you have scanned all the history QR codes before, it means that all the data is updated.
After browsing and scanning all history QR codes, you can return to the normal operation view at any point by long pressing (over 2 seconds) the multi-use button. Otherwise, the logger resumes the normal operation view after 3 minutes of inactivity in the history view.
You can recognize the normal operation view from the QR code and the current temperature shown on the logger screen. History screens have the text "History #X" where the temperature value would be shown.
History QR code notification
After scanning the QR code for the first time, the following notification is shown in the scanner, if history QR codes have been produced.
Contact firstname.lastname@example.org to enable this feature.