Example Code for Arduino Human Detection with AM412 Pyroelectric Infrared Motion Detection Sensor (SEN0171)

This guide details the integration of a PIR motion sensor with Arduino for human detection, featuring hardware setup, software installation, wiring diagrams, and sample code for effective motion sensing.

Hardware Preparation

Name	Model/SKU	Quantity	Purchase Link
PIR Motion Sensor	SEN0171	1	DFRobot
Indicator LED	-	1	-
Arduino/Raspberry Pi Controller	-	1	-

Software Preparation

Development Tool: Arduino IDE (Latest Version). Download link: Arduino IDE
Library Installation: Follow the guide here for library loading.

Wiring Diagram

Other Preparation Work

When the sensor just powers on, there will be unstable for a short time. The output level will be jittered, but stabilize shortly.

Sample Code

// #
// # Editor     : Youyou from DFRobot
// # Date       : 04.06.2014
// # E-Mail : [email protected]

// # Product name: PIR (Motion) Sensor
// # Product SKU : SEN0171
// # Version     : 1.0

// # Description:
// # The sketch for using the PIR Motion sensor with Arduino/Raspberry Pi controller to achieve the human detection feature.

// # Hardware Connection:
// #        PIR Sensor    -> Digital pin 2
// #        Indicator LED -> Digital pin 13
// #

byte sensorPin = 2;
byte indicator = 13;

void setup()
{
  pinMode(sensorPin,INPUT);
  pinMode(indicator,OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  byte state = digitalRead(sensorPin);
  digitalWrite(indicator,state);
  if(state == 1)Serial.println("Somebody is in this area!");
  else if(state == 0)Serial.println("No one!");
  delay(500);
}

Result

When the sensor detects the living movement body within detection range, the output pin will output high voltage of 3V, while the output indicator is lighted.Otherwise,after 2~3s,the output pin will output high voltage of 0V, while the output indicator is extinguished.

Note: When the sensor just on electricity, there will be unstable for a short time, the output terminal will be level shake!

Additional Information

The pyroelectric infrared motion sensor integrates a digital integrated body pyroelectric infrared detector, whose model is AM412. This detector is a digital intelligent PIR sensor. It interfaces directly with up to two conventional PIR sensors via a high impedance differential input. The PIR signal is converted to a 15 bit digital value on chip. A LED indicates whenever the PIR signal is above the selected threshold. All signal processing is performed digitally.

Example Code for Arduino-Human Detection