USER MANUAL
STM 550 / EMSI
–
ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 16/97
2.3.3
Illumination-controlled reporting interval
If sufficient ambient light is available, then it might be desirable to receive status updates
more often. For this, there are typically two main use cases:
◼
Adjust the update rate based on the ambient light available for harvesting
◼
Report more often during daytime (or when an office is lit) and less often during
night-time (or when an office is dark) to adapt the reporting to the usage pattern
In both cases, the higher update rate would be used whenever the ambient light level is
above a certain threshold. Figure 3 below illustrated the use of the illumination-controlled
reporting interval.
STANDARD_TX_INTERVAL
SOLAR_CELL_TX_INTERVAL
STANDARD_TX_INTERVAL
SOLAR_CELL_TX_INTERVAL
LIGHT_SENSOR_TX_INTERVAL
LIGHT_SENSOR_TX_INTERVAL
Figure 3
–
Illumination-controlled reporting interval
STM 550 can use either the light level at the solar cell (harvested energy) or the light level
at the ambient light sensor to trigger a higher update rate. To enable this feature, use the
following steps:
1.
Configure the desired light level threshold either for the solar cell or the ambient
light sensor using either the SOLAR_THRESHOLD or LIGHT_THRESHOLD registers
described in chapters 9.5.17 and 9.5.19 respectively
2.
Configure the desired reporting interval using either the SOLAR_TX_INTERVAL or
the LIGHT_TX_INTERVAL registers described in chapters 9.5.18 and 9.5.20 respec-
tively
3.
Enable the use of the defined parameters using the SOLAR CELL and LIGHT SENSOR
bit fields in the THRESHOLD_CFG1 register of the NFC interface as defined in chap-
ter 9.5.13.
Consider the available energy before lowering the reporting interval as discussed in chapter
2.3.1.