Adjust depending on your application. The actual sensor is inside a sealed metal can. The higher the potentiometer, the more sensitive the sensor will be. Each object with a temperature above absolute zero (-273.15° Celsius, -459.67° Fahrenheit, or 0 Kelvin) will radiate infrared, even us humans, and even though we mere humans cannot see this. If not properly adjusted it can create a problem due to which you will always get a high signal. Connect OUT to digital pin 2 on Arduino board. You can adjust the sensor sensitivity and delay time via two variable resistors located at the bottom of the sensor board. You can trace the pins by looking at the BISS001 datasheet and figuring out what pins they are - R10 connects to pin 3 and R9 connects to pin 7. the capacitors are a little tougher to determine, but you can 'reverse engineer' them from timing the sensor and solving! Connect the sensor as follows − Connect the +V cc to +5v on Arduino board. The sensor in the figure above has two built-in potentiometers to adjust the delay time (the potentiometer at the left) and the sensitivity (the potentiometer at the right). PIR Sensor Sensitivity Adjustment Variable Resistor: As it’s quite clear from its name sensitivity adjustment, this variable resistor is used to control the sensitivity of the PIR sensor. The sensor in the PIR detects or “reads” infrared radiation “emitted” from objects all around us. The can basically protects the sensor from noise, temperature and humidity. the one which is covered with a lens, consists of two slots and both these slots are made up of IR Sensitive materials. I have mine cranked to 11 ;-) In this example an LED will light up when movement is detected. The sensors sensitivity range between 6 to 7 meters (20 feet) and the detection angle is 110 degrees x 70 degrees. There is a tiny window made of IR-transmissive material to allow the IR signals to reach the sensor. Detecting motion with the PIR motion sensor. Determining R10 and R9 isnt too tough. Under normal condition where there is no movement in front of the sensor, both the slots in the Sensor detect same amount of infrared radiation. For this example, you need the … Connect GND with GND on Arduino. The actual PIR Sensor i.e. The sensitivity potentiometer can’t really be quantified, but it reacts intuitively. PIR sensor has three terminals - V cc, OUT and GND. Unfortunately this PIR sensor is mislabeled (it looks like they swapped R9 R17).

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