SeeedStudio 101990885, User Manual

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5.2 Occupied status, abnormal output unoccupied
Radar can determine whether a human body exists by transmitting and receiving
electromagnetic waves. The closer the body is to the radar, the higher the accuracy is.
a. The human body is out of radar’s range.
Adjust the installation angle to fit the range of the radar.
Measurement range: the electromagnetic wave reflection area is different in
different environments, and the scanning area may be slightly different.
b. Output error due to metal shielding
Thick office desks and chairs and metallic seats. This will block electromagnetic
waves from penetrating and causing inaccurate judgments.
c. The difference in scanning angle.
When the radar fails to detect the body part (torso area), it can cause errors.
d. The radar’s sensitivity is too low
The radar can be adjusted in order to improve sensitivity.
6. Functions details
6.1 Function point descriptions
Functions
Status change time/function
explanation
DP1: occupied/unoccupied
No one to occupied, report within 0.5s
Manned to unoccupied, no status
output in 1-2 minutes or so
DP2: Some people are stationary /
Some people are active
Static dynamic switching, reporting
within 0.5 seconds
DP3: Someone close to the device
/ someone moving away from the
device / someone moving without
direction
Status output once every 2 seconds
DP4: Body movement amplitude Data output once every 5 seconds