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Renesas RL78 Family
4.2.1 Display Cycle
While holding the PCB no automatic display cycling will occur – therefore to cycle the display between
temperature & humidity data and the air quality data the user must rotate the rotary encoder shaft.
4.3 Alarm
The demonstrator also has an alarm feature which allows the user to set air quality thresholds which the
system will compare each sensor reading against. On breaching any of the conditions (i.e. larger air quality
index, larger eCO2 or larger TVOC) the system enters an alarm state.
The alarm state takes the form of transitioning the display to an alarm screen, shown in Figure 10.
On top of showing this screen, the buzzer will periodically sound a tone & the RB LED will flash red.
This state will exist for a maximum of 15 seconds – without user interaction (or the user holding the PCB) the
system ill then revert back to low power mode.
If entering this mode from low power state, this will occur only once – after which the system will return to
sleep after 15 seconds. If the user has missed the alarm and the system has returned to sleep, the alarm will
sound again only once the user wakes the system, methods of which outlined in sections 4.1 & 4.2.
The only way to acknowledge and remove this alarm is, to click the rotary encoder shaft button while on
the alarm screen – this exits the alarm state and disables the alarm.
4.3.1 Alarm Setting
To access the alarm thresholds for the air quality sensor the user must first navigate to the screen displaying
the air quality data, from here the user must hold down the rotary encoder shaft button this will transition
the display to allowing the setting of alarm thresholds for each metric, shown in Figure 11.
1. eCO2 – larger value means worse air quality i.e., more estimated CO2.
2. IAQ Index – larger values means worse air quality.
3. TVOC – larger value means worse air quality i.e., more TVOC's present.
To increment or decrement each value the user should rotate clockwise and anti-clockwise the rotary
encoder respectively.
To cycle between the values i.e., change which value is being manipulated by the encoder, the user must
click the rotary encoder shaft button.
Once satisfied with the alarm thresholds, the user must hold down the rotary encoder shaft button, the
system will then transition to the alarm on/off screen, shown in Figure 12 – here use the rotary encoder to
select alarm on or off and finally when satisfied with the selection click the rotary encoder shaft button
and the system will return to the air quality data screen.
R12QS0074EG0100 Rev.1.00
Oct.26.23
Y-DK-IAQ-SENSE-RL78G23 – Quick Start Guide
Figure 10. Alarm Screen
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Figure 11. Alarm Setting Screen
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