Technical summary
1. Detection distance: approximately 3 to 5 meters
2. Using Doppler radar technology, a microwave sensor module that specifically detects the movement of objects
3. The module features high sensitivity, long detection distance, strong reliability, wide detection angle, wide supply voltage range, etc.
4. Widely used in various situations such as human body induction lighting and anti-theft alarms
5. Adopts a special RCWL-9196 signal processing control chip
6. Wide operating voltage range: 4.0 ~ 28.0V
7. Compared to the traditional infrared induction PIR, it has a penetrating detection capability
8. Blocking time and distance adjustable
9. Can output a 3. 3V power supply
Pin function description:
1. Output voltage 3.3V, drive current 100mA.
2. Module ground GND
3. OUT controls the signal output. When an object moves in the detection area, OUT outputs a high level; C-TM can set the repeat trigger time. If there is a trigger signal (an object moves) during the repeat trigger time, it keeps outputting a high level.;If there is no moving object in the detection area, low level output
4. VIN module power input, 4-28V
5. CDS trigger control signal; below 0.7V, OUT always outputs a low level; above 0.7V, detection works normally, the CDS pin is connected to a photoresistor and the module's detection function can be disabled at night
Adjustment section instructions:
1. C-TM: adjust the repeat trigger time, the default trigger time is 2S, increasing the capacitance increases the repeat trigger time, the actual calculation of the repeat trigger time can be done as follows: place a capacitor on C-TM, and test the frequency f of pin 3 of the 9196, repeat trigger time T= (1/f) *32768
2. R-GN detection distance setting, connected to a resistor, the detection distance becomes smaller; not connected, the detection distance is about 7m; connected to a 1 m resistor, the detection distance is about 5m, the customer can adjust according to the actual situation
3. The internal VCC of R-CDS is connected in parallel with the internal 1 m resistor to the CDS pin (that is, pin 9 of the 9196) through R-CDS. CDS is connected to the photoresistor, and the module's detection function can be disabled at night, and the R-CDS value can be set according to the actual ambient brightness
Points to pay attention to in the application design:
1. There must be no metal shielding in front of the detection surface
2. There must be more than 1cm of clearance in front of and behind the detection surface.
3. The module should be as parallel as possible to the plane of the mounting bracket
4. The application is effective within a certain detection area
5. The component side of the module is the positive detection side, and the reverse side is the negative detection side, and the negative detection side has a slightly weaker detection effect.
6. Microwave modules cannot be used on a large scale in the same area, otherwise there will be mutual interference, and the distance between individual units is more than 1M
