4. FAQ
1. Q1: How much does the sunlight in night-time and day-time environments affect the rain
detection sensitivity and accuracy? What
’
s the purpose of optical calibration?
A1: There is no effect, because
the module uses HALIOS®
-SD patented technology that can
reduce the influence of sunlight on the module; optical calibration can eliminate the optical
path asymmetry caused by problems like components, module production and installation
tolerance.
2. Q2: Is there any environment requirement or any specific operation method for performing
optical calibration?
A2: Please refer to chapter 2.2.3 for calibration steps.
3. Q3: Does strong light illumination on the product affect the module
’
s performance or
cause false triggering?
A3: There is no effect under symmetrical optical conditions. For one measurement period,
the ambient light can be considered as a stable background value. There is a very small
probability that the ambient light varies much within the same period.
4. Q4: What are the EMC and EMI levels of the module?
A4: ESD:
±
8K; temperature range: -40~85
℃
; alternating humid heat: 25~60
℃
,
45%~95%RH.
5. Q5: What is the recommended thickness of the glass board?
A5
：
The recommended distance from the glass outer surface to the "front side" of
the PCB is 4mm, and the thickness of the glass can be changed within the range.
6. Q6: Can I set the sensor to automatically upload data when it detects a change in
rainfall status?
A6: Sorry, you can't. As described in chapter 1.2.3, when the rainfall status output
frequency is disabled, send command"3A 01 00 00 0D" to query the rainfall status; when
it is not disabled, the rainfall status will be fed back immediately, and return nothing for
no rain.
7. Q7: What kind of value will be output when the module detects real-time rainfall, real-
time light, and real-time temperature?
A7: The values generated in these modes are the raw data directly output by the sensor.
There is no correlation curve for raw rainfall data and ambient light data, and the
temperature data can be calculated according to the formula in Figure 1.2.
