PIR Sensor (Interface to ESP8266)

• Schematic

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• Reference

  • 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

• ESP8266

  • GPIO12 : PIR Out
  • VCC : 3.3 / 5V
  • GND : GND

• Sample Arduino Code

  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);
  }