It will continuously output the high level TTL signel when there is motion. It has a maximum range of 9m with adjustable delay time and sensitivity.
It is perfect for DIY microwave motion sensor light switch, human sensor toys, smart security devices, etc.
But unlike PIR motion sensor, instead of sniffing the black body radiation from a moving person, this sensor uses a “microwave Doppler radar” technique to detect moving objects.
That's why it is much more effective and precise than the PIR sensor.
Unlike the PIR motion sensor it can detect object all around it (360 degree). And as it is based on microwave, the signal can penetrate through walls.
When motion is detected, its "OUT" pin will switch from LOW (0 V) to HIGH (3.3 V) for a finite timebefore returning to its idle (LOW) state.
Supply Voltage: 4–28 VDC (tested with 5 V)
Operating frequency: ~3.2 GHz
Transmit power: 20 mW (typical)/30 mW (max)
Sensing Distance: 5–7 m
CDS — Sensor disable input (low = disable)
VIN — 4-
OUT — HIGH (3.3 V) motion detected/LOW (0 V) idle
GND — Ground/0 V
3V3 — Regulated DC output (100 mA max)
Applications: burglar alarm, automatic staircase light and other motion sensor based project
Detection distance and output timeout of the module can be adjusted by adding passive components in their respective solder pads located at the rear of the circuit board (see above figure).
There is also a provision to add a light-
This is applicable only when a light sensor is soldered in its pads (CDS) on the front of the circuit board. A 47–100K resistor works fine with standard 5-