USER MANUAL
EMDC
–
ENOCEAN MOTION DETECTOR AND LIGHT LEVEL SENSOR
© 2020 EnOcean | www.enocean.com
EMDC User Manual | v1.0 | March 2020 | Page 14/75
2.6
Reporting interval
EMDC will always report the initial motion detection after a period without detected motion
immediately. The rate of subsequent updates (reporting interval = time between two data
telegrams) can be configured by the user based on different conditions.
The minimum configurable reporting interval is 3 seconds and the maximum possible trans-
mission interval is 65535 seconds.
2.6.1
Energy considerations
The default reporting interval of 120 seconds (one update every two minutes) when unoccu-
pied (no motion detected) and 60 seconds (one update every minute) when occupied (motion
detected) is adjustable using the NFC interface as discussed in the subsequent chapters.
Lowering the reporting interval will increase its power consumption since EMDC will measure
and transmit more often. Likewise, increasing the reporting interval will reduce power con-
sumption since it will measure and transmit less often.
To select the right reporting interval, it is essential to determine the amount of harvestable
energy. EMDC harvests energy from the available ambient light; therefore, the amount of
available energy is determined mainly by the intensity of the available light and the amount
of time during which the light is available.
The amount of available ambient light can be determined by executing an ambient light test
as described in chapter 2.5.5. The light availability period (the time during which the ambient
light is available) has to be determined based on the lighting scheme used for the environ-
ment where EMDC is installed.
EMDC is designed to provide one update per minute while a room is occupied based on 200
lux of ambient light available for 6 hours per day.
The minimum supported update interval (for the case of a room being occupied) for self-
supplied operation based on other conditions is summarized in Table 1 below. This table
assumes that the update interval for the case of an unoccupied room will be double this
value.
6 hrs / day
8 hrs / day
10 hrs / day
12 hrs / day
50 lux
Not supported
Not supported
180 s
120 s
100 lux
120 s
90 s
90 s
60 s
150 lux
90 s
60 s
60 s
45 s
200 lux
60 s
45 s
45 s
30 s
300 lux
45 s
30 s
30 s
20 s
400 lux
30 s
25 s
25 s
15 s
500 lux
25 s
20 s
20 s
15 s
Table 1
–
Minimum self-supplied reporting intervals