ENV+ Sensor Wake-ups and Data Transmission

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ENV+ Eversensors are always on, but only transmit data when necessary.  This period of transmission is called a "wake-up".  This article will outline when sensors transmit and how to adjust wake-up behavior.

How to spot a wake-up

On the same plane as the solar (PV) harvester, on the same side as the Everactive logo, the ENV+ has a red status light.  This light will flash during a wake-up.



Note that the image above is a looped GIF- typical wakeups will be further apart.


Scheduled / Solicited Wake-ups

By default, the Evergateway USB dongle will wakeup your sensor once a minute.  At this time you'll see a single red flash like the GIF above.


Adjusting Scheduled Wake-ups

Since scheduled wake-ups start are solicited by the Evergateway, the wake-up period is controlled through the Evergateway settings.

You can reach the Evergateway settings by navigating to:

Or by clicking on the "Manage Evergateways" tile in Management pane of the Gear Menu.


From there, select your Gateway and click the "Edit" button to make configuration changes:



From the editor, scroll down to "Evernet Network Settings".  The broadcast period is measured in seconds.




Make sure to click the "Save" button in the lower left corner to write your configuration changes.


Unsolicited Wake-ups

ENV+ Eversensors also have a shock sensor on board that can tell when the sensor has been moved.  This type of wake-up is triggered by acceleration greater than 0.5G in any direction.  The sensor will flash the status light three times when this type of wake-up occurs.

Note: this video is slowed down, the three flashes will occur within approximately 1 second.


Data Transmission

Regardless of the method of wakeup, the same data is transmitted to the cloud.


Energy Aware Mode Behavior

Additionally, the sensor has a built in Energy Aware Mode to optimize for diminished harvesting environments. The sensor will wait to connect to the virtual gateway until the voltage capacitor level (VCAP) reaches 2.4V or greater.


The sensor LED will double-blink on sensor data request broadcast when the voltage capacitor level (VCAP) is less than 2.0V.


If the voltage capacitor level is below the 2.0V, movement events will not immediately send an unsolicited uplink to the virtual gateway; however, the movement detection flag will be set in the next sensor data broadcast response if the sensor moved.




If you have additional questions, comments, or concerns, please contact us by email: developers@everactive.com 

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