USER MANUAL
EMDC
–
ENOCEAN MOTION DETECTOR AND LIGHT LEVEL SENSOR
© 2020 EnOcean | www.enocean.com
EMDC User Manual | v1.0 | March 2020 | Page 19/75
3.2
Illumination measurement (light level sensor)
EMDC integrates a dedicated illumination sensor used to accurately measure and report the
light level directly underneath (e.g. on the desk surface).
This sensor has a narrow aperture and a spectral response optimized to mimic the human
eye’s perception of a
mbient light. It reports the light level directly underneath the sensor
(spot measurement).
Figure 8 shows the spectrum response of the EMDC illumination sensor compared to that of
the human eye.
Figure 8
–
Spectrum response of the illumination sensor
3.3
Illumination measurement (solar cell)
EMDC can use SIGNAL telegrams - as described in chapter 5.2 - to report the light level by
measuring the energy generated by the solar cell. This functionality can be used both to
ensure that sufficient ambient light is available to power the device and to measure incoming
light if the solar cell is oriented towards the window.
Reporting of the solar cell light level can be enabled and disabled via SIGNAL register of the
NFC interface as described in chapter 9.5.9. By default, the reporting is disabled.
In addition, the light level of the solar cell can be reported instead of the light level of the
ambient light level sensor. The selection is done using the LIGHT_SENSOR_CFG register of
the NFC interface as described in chapter 9.5.15.
