Let's see in in simple words how the ERS DESK works.
The ERS Sensor works on a very interesting way:
- It detects different environmental data from the place where it is located (let's say the room), this data includes the room temperature.
- The device (thanks to motion and InfraRed sensors) calculates an average of the temperature of all what it's in front of it (it means, mainly the place where somebody would be located if the desktop would be busy).
- What would happen if the desktop is free?
On this case the average of the temperature in front of the sensor would be very close to the temperature of the room, so the desktop would be marked as Free (The devices reports to the IoT platform "occupancy" = 0)
- What would happen if the desktop is busy?
On this case, the average of the temperature in front of the sensor would be a bit higher than the temperature of the room, so the desktop would be marked as Busy (The devices reports to the IoT platform "occupancy" = 2)
It's important to mention that between Free (0) and Busy (2), there is an intermediate status ("occupancy" = 1) indicating that basically somebody is just arriving or leaving. Each time that the device changes between Free and Busy, the device will pass briefly during this intermediate status.
Internal tests show that when a person occupies the desktop, the occupancy reported by the device was updated (from Free to Intermediate Status) in about 60 seconds. The moment occupancy value is changed, the information is sent by the ERS Device to the ALSO platform.
When the intermediate status is temporally set, the device will check again in 60seconds, changing the occupancy to either Busy or Free. It can be noticed that intermediate status does not last very much. Most of the time, a desk will be either Busy or Free.
Besides these quick immediate updates on the occupancy, the device also sends regular updates (less frequently) about temperature, humidity, luminosity and even battery. As these are less critical, a message is sent on periodic intervals of 5 minutes.