RCWL-0516 Microwave Radar Motion Sensor
RCWL-0516 is a mini doppler radar microwave motion sensor module which can act as an alternative to a PIR motion sensor.
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.
RCWL-0516 is a radar sensor which is used for motion detection, just like PIR motion sensor.
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- to 28-V DC supply input
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-dependent resistor (LDR/CDS), and a sensor disable input pin is available to defeat the ambient light sensing option if necessary.
C-TM: Adjust repeat trigger time (default 2 sec). Adding a capacitor will give a longer repeat trigger time.
R-GN: Detection distance adjustment (default 7 mtr). Adding a resistor the detection distance will become shorter. If connected with a 1-MΩ resistor, detection range is about 5 m.
R-CDS: By adding a resistor (in parallel with the internal 1-MΩ resistor), user can change the light detection threshold as per individual requirement.
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-mm LDRs.