# PIR Sensor (Interface to ESP8266)

* Schematic
  + ![](./Pirschematic.png)
  + ![](./pir-pcb-800x564.jpg)
* [Reference](https://www.tweaking4all.com/hardware/pir-sensor/)
  + Initial Warm Up : 30 to 60 seconds to stabilize
  + Delay Time : (2s - 200s) Determines how long the PIR will keep the Output “High” (ON) after detecting motion.
  + Sensitivity : Set the sensing “range”. 3 - 6 meter
  + Retrigger Jumper
    - L : non-retriggering. Output ON and OFF upon detection
    - H (Default) : retriggering. Output remains ON upon detection

* [Datasheet](./BISS0001-SilvanChip.pdf)
* [ESP8266](./esp8266.md)
  + GPIO12 : PIR Out
  + VCC    : 3.3 / 5V
  + GND    : GND

* Sample Arduino Code
  ```arduino
  int inPin = 12;

  void setup() {
    // put your setup code here, to run once:
    Serial.begin(9600);

    pinMode(inPin, INPUT);
  }

  void loop() {
    // put your main code here, to run repeatedly:
    int val = digitalRead(inPin);
    Serial.print("*Detected = "); Serial.println(val);

    Sleep(500);
  }
  ```