Example Code for Arduino-Motion Detection

Hardware Preparation

• Arduino UNO (or similar) x1
• Microwave sensor x1
• 3PIN digital cable x1

Software Preparation

• Arduino IDE V1.6.5 Click to Download Arduino IDE from Arduino®
• Download and install the MsTimer2 Library. (About how to install the library?)

Wiring Diagram

Other Preparation Work

Align the antenna surface toward the area to be monitored.
The detection range can be continuously adjusted from 2 to 16 m.
Turning the potentiometer toward MIN decreases the detection range,
while turning it toward MAX increases the detection range.

Sample Code

Please download MsTimer2 library first. Here is tutorial about Library installation.

/*!
 * @file  microwaveSensor.ino
 * @brief  This example reads temperature and humidity from SHT1x Humidity and Temperature Sensor.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  Loan <[email protected]>
 * @version  V1.0
 * @date  2015-7-30
 */

/***********Notice and Trouble shooting***************
  1.Connection and Diagram can be found here
<https://wiki.dfrobot.com.cn/_SKU_SEN0192__Microwave_sensor%E5%BE%AE%E6%B3%A2%E4%BC%A0%E6%84%9F%E5%99%A8%E6%A8%A1%E5%9D%97>
  2.This code is tested on Arduino Uno, Leonardo, Mega boards.
  3.arduino Timer library is created by jonoxer.
  See <https://www.dfrobot.com.cn/images/upload/File/SEN0192/20160112134309yy5nus.zip arduino Timer library> for details.
 ****************************************************/
#include <MsTimer2.h>           //Timer interrupt function
int pbIn = 0;                   // Define the interrupt PIN is 0, that is, digital pins 2
int ledOut = 13;
int count = 0;
volatile int state = LOW;       //Define ledOut, default is off

void setup()
{
  Serial.begin(9600);
  pinMode(ledOut, OUTPUT);
  attachInterrupt(pbIn, stateChange, FALLING); // Sets the interrupt function, falling edge triggered interrupts.
  MsTimer2::set(1000, process); // Set the timer interrupt time 1000ms
  MsTimer2::start();//Timer interrupt start

}

void loop()
{
  Serial.println(count); // Printing times of 1000ms suspension
  delay(1);
  if (state == HIGH) //When moving objects are detected later, 2s shut down automatically after the ledout light is convenient.
  {
    delay(2000);
    state = LOW;
    digitalWrite(ledOut, state);    //Turn off led
  }

}


void stateChange()  //Interrupt function
{
  count++;

}

void process()   //Timer handler
{
  if (count > 1) //1000ms interrupt number greater than 1 is considered detected a moving object (this value can be adjusted according to the actual situation, equivalent to adjust the detection threshold of the speed of a moving object)
  {
    state = HIGH;
    digitalWrite(ledOut, state);    //Lighting led
    count = 0; //Count zero

  }
  else
    count = 0; //In 1000ms, interrupts does not reach set threshold value is considered not detect moving objects, interrupt the count number is cleared to zero.
}