Figure 11: System mounted into enclosure. Photo courtesy of Marko Kannisto
Using the system is fairly simple. With the SET button, a user can define these parameters in following order:
- Current hour and minute
- Ambient light lux-level threshold (default is 2 lux )
- Light turn-off time at the evening
- Light turn-on time in the morning
The turn off/on times at the evening and in the morning do not have to be set. If not set, then the luminaire will be switched on when ambient light crosses the preset lux-level threshold at dark; it will be switched off when ambient light rises above that threshold. In this mode, the time information from the RTC is not processed.
Programmed information can be read by pressing the SET button for less than 1 second. The system will then display the hour, minute, ambient lux-level threshold, light turn-off time, and light turn-on time in that order.
If a user wants to change the programmed parameters or wants to adjust the time, then press the SET button for longer than 2s. Parameters can then be set one at a time in the same order as above. When a parameter is to be programmed, press the SET button longer than 2s so the parameter can be recorded. Same procedure is done for all parameters.
When all parameters are programmed, the system will show them one at a time so the user can verify that everything is stored correctly.