These are optional modes and there is no need to work on these modes to use the module. There are two trigger modes in the module marked with the letter “L” and “H” that is also shown in the image above. The back side circuitry also contains two variable resistors / adjusters, one variable resistor is given to adjust the sensitivity of the module or in other words we can say the detection range of the module and other one is used to adjust how much time the output will remain high after the PIR module has detected an activity. Module sensitivity & time delay adjustments The backside of the PCB is the circuitry with chip and all the components require for processing the information received from the sensor. As shown in above image these are small approximately 1.2 x 0.9 inch sized printed circuit board with the PIR motion sensor mounted on the front side and covered by a white fresnel lens that increases the performance of the lens and at the same time protect it. HC SR501 PIR motion sensor also called Pyroelectric, Passive infrared or IR motion sensor. HC SR501 PIR Motion Sensor Module Explained / Description Easy to communicate with analog circuits.Easy to communicate with any platform like Arduino or Raspberry Pi etc.
Using BISS0001 high quality PIR processing chip.Temperature sensing control feature (Optional).Light sensing control feature (Optional).But you can use them to enhance your project. Can be used separately without any additional microcontroller or platform like Arduino or Raspberry Pi etc.Adjustable output time delay (Adjust how much time the output will remain high after the sensor detects a signal).Adjustable sensitivity or detection distance.Low power consumption in idle mode only 50uA and 65mA in fully active mode.Wide operating voltage range from 4.8V to 20V.The spectral sensitivity of the sensor is controlled by the optical transfer characteristics of the window in the case and has been optimized to pick up radiation of the human body.Advertisements HC SR501 Module Features & Technical Details The voltage across the sensors controls a J-FET source follower impedance converter and thus modulates the output current of the PIR detector. If the active elements of the PIR sensor are exposed to a change in the surrounding temperature field, electrical charges are separated within the sensor elements. Thermal signals far below one microwatt are sufficient to trigger a sufficient output voltage change. This results in good compensation of environmental temperature and excellent sensitivity for small changes of a spatial temperature pattern. It contains two active elements configured as balanced differential series opposed type. The RE200B is a passive infrared sensor designed to pick up heat radiation of wave lengths in a band around 10 microns.
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