Pir sensor schematic code#

If (digitalRead(2) = HIGH) // check if PIR is triggered.ДigitalWrite(3, HIGH) // turn the LED/Buzz ONДigitalWrite(3, LOW) // turn the LED/Buzz OFF

We turn this pin on and off with a delay of 100 milli second so that we can attain the flashing or buzzing output. So, now we has make our output pin (pin 3) to go high. If we find that the particular pin has gone high, it means that the PIR module has be triggered. So we always check if the Pin 2 has gone high by using the below line inside the loop() function.

Pir sensor schematic code#

As we know the code in here gets executed as long as the MCU is powered on. In the void setup function shown below, we have to declare that the pin 2 connected to PIR output will be used as input and the pin 3 connected to LED/Buzzer will be used as input. Then we have to produce a discontinuous trigger whenever the pin 2 goes high. To connect ArduinoВ PIR Sensor, we have to assign the pin number 2 as input and pin number 3 as output. The program for Arduino is pretty simple and straight forward. We will program the Arduino to trigger an Output on 3 rd pin if an Input has been detected at 2 nd pin. This pin will act as the output pin of the Arduino. Then the 3 rd pin of Arduino is connected to the LED and Buzzer. This pin will be the INPUT pin for Arduino. The output pin of the PIR Sensor is connected to the 2 nd digital pin of Arduino. We have powered the PIR sensor using he 5V Rail of the Arduino. The circuit Diagram for arduino motion detector project by interfacing Arduino with PIR module and blinking an LED/Buzzer is shown in the below image. Follow the Silk screen to determine you pinouts Note:В The position of potentiometers or pins may vary based on your PIR sensor vendor. Once the person has left the area the pin will go low after the particular time which can be set using the potentiometer. In вЂњIвЂќ mode the output pin Dout will go high (3.3V) when a person is detected within range and will stay high as long as he/she stays within the limit of the Sensors range. We are using our module in вЂњHвЂќ mode in our project. In this mode the output pin will go high irrespective of whether the person is still present inside the range or has left the area. In вЂњHвЂќ mode the output pin Dout will go high (3.3V) when a person is detected within range and goes low after a particular time (time is set by potentiometer). One is the вЂњHвЂќ mode and the other is the вЂњIвЂќ mode. On the top left corner it also has a trigger pin setup which can be used to make the module work in two different modes. The module works on 3.3V but can be powered with 5V as well. Basically the Dout pin of the sensor is present in between the Vcc and Gnd pins. The two potentiometers (orange color) are used to control the sensitivity and trigger on time of the sensor. Also the PIR sensor modules provide us some options to adjust the working of the sensor as shown in below image. There are two important materials present in the sensor one is the pyroelectric crystal which can detect the heat signatures from a living organism (humans/animals) and the other is a Fresnel lenses which can widen the range of the sensor. It is a low cost sensor which can detect the presence of Human beings or animals. The PIR sensorВ stands for Passive Infrared sensor.