Sagnik Ghosh
Published © GPL3+

IoT-Based Smart Street Light System

A smart city is an urban area that uses different types of electronic data collection sensors to supply information used to manage assets.

BeginnerFull instructions provided2 hours110,004
IoT-Based Smart Street Light System

Things used in this project

Hardware components

Arduino UNO Wifi Rev.2
Arduino UNO Wifi Rev.2
×1
LED (generic)
LED (generic)
×1
LDR, 1 Mohm
LDR, 1 Mohm
×1
IR Proximity Sensor
Digilent IR Proximity Sensor
×1
ESP8266 ESP-12E
Espressif ESP8266 ESP-12E
×1
Resistor 1k ohm
Resistor 1k ohm
×1

Software apps and online services

Arduino IDE
Arduino IDE
ThingSpeak API
ThingSpeak API

Hand tools and fabrication machines

Breadboard, 170 Pin
Breadboard, 170 Pin

Story

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Schematics

Smart iot street light

Code

IOT smart light

Arduino
int  smooth;
int LDR;
int threshold = 40;//sun's intensity
int brightness = 0;
int ledState = 0;

int sensor1 = 11;
int sensor2 = 8;
int sensor3 = 9;

int led1=5;
int led = 6;
int led2=2;

int carPresent = 0;
int carPresent1 = 0;

float beta = 0.65;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(sensor1, INPUT);
  pinMode(sensor2, INPUT);
  pinMode(sensor3, INPUT);
  pinMode(led,OUTPUT);
  pinMode(led1,OUTPUT);
   pinMode(led2,OUTPUT);
}


void loop() {
  smooth = smooth - (beta * (smooth -  analogRead(A0)));
  delay(1);
  LDR = round(((float)smooth / 1023) * 100);
  if (LDR <= 40)
    brightness=0;
  else
  {
    brightness = map(LDR, 40, 100, 0, 255);
  }
  checkSensors();
  if (carPresent == 1)
    {
      ledState = 1;
        digitalWrite(led,HIGH);
        digitalWrite(led1,HIGH); 
        analogWrite(led,brightness);
        analogWrite(led1,brightness);
    }
   else if (carPresent == 0)
    {
      ledState = 0;
       digitalWrite(led,HIGH);
       //digitalWrite(led1,HIGH); 
      analogWrite(led,ledState);
      //analogWrite(led1,ledState);
     if(carPresent1 == 1)
    {
      ledState = 1;
      if(ledState == 1)
      {
     
      analogWrite(led1,brightness);
       analogWrite(led2,brightness);
     }
    }
    
     else if (carPresent1 == 0)
    {
      ledState = 0;
       digitalWrite(led1,HIGH); 
       digitalWrite(led2,HIGH); 
      analogWrite(led1,ledState);
      analogWrite(led2,ledState);
     }
    }
    
String data = (String)ledState+","+(String)brightness+";";
Serial.print(data); 
//  Serial.print(digitalRead(sensor1));
//  Serial.print("\t");
//  Serial.print(digitalRead(sensor2));
//  Serial.print("\t");
//  Serial.print(ledState);
//  Serial.print("\t");
//  Serial.println(brightness);
delay(100);
}

void checkSensors()
{
  if (digitalRead(sensor1) == 0)//Car captured in 1st sensor
  {
 
   if (digitalRead(sensor2) == 1)//Car still didnt reach the 2nd sensor
      carPresent = 1;
  }

  else if (digitalRead(sensor2) == 0)//Car reached the 2nd sensor
  { //No cars detected behind the first car
    if (digitalRead(sensor1) == 1)
    {
      carPresent = 0;
     carPresent1 = 1;
    }

    else if (digitalRead(sensor1) == 0 )
      {
        analogWrite(led,brightness);
         analogWrite(led1,brightness);
         analogWrite(led2,brightness);
        
         digitalWrite(led,HIGH); 
         digitalWrite(led1,HIGH);
          digitalWrite(led2,HIGH);
      }
  }

  
  else if(digitalRead(sensor3) == 0)//car reached the 3rd sensor
  {
    //No cars detected behind the first car 
     if (digitalRead(sensor2) == 1)
    {
      carPresent = 0;
   
    carPresent1 = 0;
    }
     else if (digitalRead(sensor2) == 0 )
      {
       carPresent = 0;
       carPresent1 = 1;
      }
   }
 }

Code part 2

Arduino
#include <ESP8266WiFi.h>

// Network Information
const char* ssid     = "ardent";
const char* password = "12345678";

String ledState = "";
String brightness = "";

char thingSpeakAddress[] = "api.thingspeak.com";
String writeAPIKey = "NUEBLW9OA58DLL4N";          // Be sure to change this to your channel Write API key
WiFiClient client;

void setup()
{
  Serial.begin( 115200 );   // You may need to adjust the speed depending on your hardware.
  connectWifi();
}
void loop()
{
  filterData();
  HTTPPost( );
  delay( 15000 );
  // If you remove the sleep, be sure to add more delay so you don't post to ThingSpeak too often.

}



int connectWifi()
{
  WiFi.begin( ssid , password );
  while (WiFi.status() != WL_CONNECTED) {
    //Serial.println( "Connecting to WiFi" );
    delay( 2500 );
  }
  //Serial.println( "Connected" );  // Inform the serial monitor
}

void HTTPPost() {

  // This function builds the data string for posting to ThingSpeak and provides the correct format for the wifi client to communicate with ThingSpeak.
  // It will post "numFields" worth of data entries, and take the data from the fieldData parameter passed to it.
  // Be sure to increase numFields to the number of fields you need, and activate the fields in your channel view.

  if (client.connect( thingSpeakAddress , 80 )) {

    // Build the Posting data string.  If you have multiple fields, make sure the sting does not exceed 1440 characters.
    String PostData = "api_key=" + writeAPIKey ;

    PostData += "&field1=" + ledState;
    PostData += "&field2=" + brightness;

    // POST data via HTTP
    client.println( "POST /update HTTP/1.1" );
    client.println( "Host: api.thingspeak.com" );
    client.println( "Connection: close" );
    client.println( "Content-Type: application/x-www-form-urlencoded" );
 
   client.println( "Content-Length: " + String( PostData.length() ) );
    client.println();
    client.println( PostData );
    client.stop();
  }
}

void filterData() {
  if (Serial.available())
  {
    String buffer = "";
    buffer = Serial.readStringUntil(';');
    int i1 = buffer.indexOf(',');
    ledState = buffer[0];
    buffer.remove(0, i1 + 1);
    brightness = buffer;
  }
}

Credits

Sagnik Ghosh

Sagnik Ghosh

4 projects • 38 followers
DIY enthusiast- Crazy Engineer,Mathematics is Love,Projects on Embedded S/W, Electronics, RC Vehicles.

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Related channels and tags
  • Arduino
  • Digilent
  • Espressif
  • Internet of Things
  • ThingSpeak