User's Guide

AT58L4M32-2020 Motion sensor
Version 1.2
Page 7
Photosensitive Detection
The module supports photosensitive detection. The sample module does not turn on the
photosensitive detection function by default. The position shown in Figure 3 is the photodiode.
The photosensitive threshold can be adjusted by changing the photosensitive judgment
threshold or tuning the photosensitive resistance. When the photosensitive function is turned
on, the radar sensing will be started only when the ambient light is lower than the set value. If
the light is too bright, the module will not start the sensing function.
Power on Sequence
The module has a power-on self-test function, that is, after the module is powered on,
the out pin outputs the high level first, the low level is output after the delay of 2s, and the low
level is delayed for 0.5s before entering the normal induction mode. The following is the
sequence diagram of the control signal after the module is powered on：
Figure4 Power on Sequence
OUT
vcc
2 S
0.5 S
With inductive out = 1, without
inductive out = 0