IEEE Consumer Electronics Magazine - May/June 2021 - 32

Smart Village
Figure 5. Output values during system operation.
Figure 4. User action flow in the experiment.
addition, the experiment was performed under
fluorescent light with the windows closed to
exclude sunlight. The flow of the experiment was
as shown in Figure 4. We recorded the value of
each sensor output and the presence or absence
of an alert.
Results of Experiment 1
Figure 5 shows the output values during the
operation of the system. Based on the presence or
absence of alerts during waiting period 1 and waiting
period 2, which are shown in Figure 4, it was
judgedwhether the systemwas operating normally.
During waitingperiod1, shown at around 30-40 s
in Figure 5, the state is " human undetected/flame
detected " (S ¼ [0, 1]), which can be regarded as the
unattended flame state. During this time, we confirmed
that the alert for preventing to turn OFF the
stovewas given. Waiting period 2, which is shown at
around 60-70 s in Figure 5, is a state of " human
detected/flame undetected " (S ¼ [1, 0]). These
results show that the system could detect a stove
that the user forgot to turn OFF andthatitissued
alerts in only the appropriate state.
Experiment 2. Confirming Operation Under
Conditions for Actual Use
Finally, we conducted an experiment to confirm
that the system operated effectively under
conditions for actual use. The exposure environment
was changed according to the same
32
Table 1. Systemperformance under various environmental
conditions.
Exposure type
Dark room
Performance rate
120 / 120
Fluorescent light (Blinds closed) 120 / 120
Fluorescent light (Blinds opened) 120 / 120
procedure as in Experiment 1. Each experiment
was performed 120 times, and we recorded the
results.
Results of Experiment 2
The experimental results are shown in Table 1.
It was confirmed that the reminder alert issued as
intended under all environments tested in this
experiment and the reminder alerts could be
executed.
According to the results in Table 1, the proposed
system showed good performance and in
the applicable level. Additionally, the proposed
intelligent reminder system conducts main operations
while the flame of the gas stove is being on.
Otherwise, only the flame sensor is working.
Therefore the energy consumption of the proposed
reminder system is very small during the
time that the gas stove is not used. Even the
reminder system makes operation; the energy
consumption is very low, since the system consists
of lowenergy hardware such as flame sensor,
human sensor, microcontroller, and BLEmodules.
CONCLUSION
In this article, wedescribed the development of
a system to provide reminders for an unattended
gas stove flame. The reminders were issued by
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