juan pendas
Published © CC BY

Smart Road Infrastructure (SRI)

Revolutionize roads with our Smart Infrastructure Monitoring System! Inductive sensors ensure real-time data for safer, smoother journeys.

BeginnerFull instructions provided10 hours108
Smart Road Infrastructure (SRI)

Things used in this project

Hardware components

AVR IoT Mini Cellular Board
Microchip AVR IoT Mini Cellular Board
×1
Inductive Proximity Sensor, Stainless Steel
Inductive Proximity Sensor, Stainless Steel
×1
9V 1A Switching Wall Power Supply
9V 1A Switching Wall Power Supply
×1

Software apps and online services

Arduino IDE
Arduino IDE
Adafruit server

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Breadboard, Plain
Breadboard, Plain

Story

Read more

Schematics

Schematics

Code

Arduino code

Arduino
This is the code loaded into the AVR-IoT Cellular Mini
//Smart Road Infrastructure Monitoring and Maintenance System
// Author: Juan Pendás Arévalo
// Hacksterio IoT The Future of Resilience Contest

//Libraries
#include <Arduino.h>
#include <mcp9808.h>
#include <mqtt_client.h>
#include <lte.h>

//Definitions
#define MQTT_THING_NAME "ITC"
#define IO_USERNAME "Tels30" 
#define IO_KEY " "
#define MQTT_USE_TLS false
#define MQTT_KEEPALIVE 60
#define MQTT_USE_ECC false
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883
#define MQTT_PUB_TOPIC1 "Tels30/feeds/Log"
#define MQTT_PUB_TOPIC2 "Tels30/feeds/Temp"
#define MQTT_PUB_TOPIC3 "Tels30/feeds/Cars"

//Variables
bool carIn = false;
unsigned long entryTime = 0, elapsedTime = 0;
int carsPerHour = 0, speed;
int T = 60, last_time;

//Funtion to send data to Adafruit
void publishAda(String string, int i) {

  // Attempt to connect to the broker
  if (MqttClient.begin(MQTT_THING_NAME,
                       AIO_SERVER,
                       AIO_SERVERPORT,
                       MQTT_USE_TLS,
                       MQTT_KEEPALIVE,
                       MQTT_USE_ECC,
                       IO_USERNAME,
                       IO_KEY)) {

    Serial3.println("MQTT connection established");

    bool publishedSuccessfully;

    //Switch to choose beteewn the different topics of Adafruit server
    switch (i) {
      case 0:
        publishedSuccessfully = MqttClient.publish(MQTT_PUB_TOPIC1, string.c_str());
        break;
      case 1:
        publishedSuccessfully = MqttClient.publish(MQTT_PUB_TOPIC2, string.c_str());
        break;
      case 2:
        publishedSuccessfully = MqttClient.publish(MQTT_PUB_TOPIC3, string.c_str());
        break;
      default:
        Serial3.print("Error");
    }


    //Confirmation of publish
    if (publishedSuccessfully) {
      Serial3.print("Published message: ");
      Serial3.println(string);
    } else {
      Serial3.println("Failed to publish");
    }
    Serial3.println("Closing MQTT connection");
    delay(200);

  } else {
    Serial3.println("Connection to MQTT failed");
  }
  MqttClient.end();
}


void setup() {
  //Initialize the Serial mMnitor
  Serial3.begin(115200);

  if (Mcp9808.begin(0x18)) {
    Serial3.println("Error");
  }

  Serial3.println("AVRIoT Cellular mini on");

  // Establish LTE connection
  if (!Lte.begin()) {
    Serial3.println("Failed to connect to operator");

    // Halt here
    while (1) {}
  }
  Serial3.println("Connected to operator");

  last_time = millis();
}

void loop() {

  if (millis() - last_time > 60000) {
    last_time = millis();
    T--;
  }

  //The temperature and the number of cars per hour should be sended every hour, but at the time to try the code we use T = 30 seconds
  if (T < 1) {

    int Temp = (int)Mcp9808.readTempC() - 163;  //Save the temperature value in Temp
    Serial3.print("Temperatura: ");
    Serial3.println(Temp);  //Print the temperature in the serial monitor
    publishAda("Temperatura: " + (String)Temp, 0);
    publishAda((String)Temp, 1);

    publish((String)carsPerHour, 2);
    carsPerHour = 0;

    delay(200);
    T = 60;
  }

  int sensorValue = analogRead(PIN_PA0);

  if (sensorValue < 1000 && carIn == false) {
    carIn = true;
    entryTime = millis();
    Serial3.println("Car in");

  } else if (sensorValue > 1000 && carIn) {
    carIn = false;
    elapsedTime = millis() - entryTime;

    /*Obtain the speed with the elapsedTime and with a cosntant value 
      this gives us an aproximity of the speed but the real speed will 
      depends on the lenght of the car*/
    speed = 20000 / elapsedTime;

    //Discard values fester that 200 mph
    if (speed < 200) {
      carsPerHour++;
      Serial3.println("Car out: Time: " + (String)elapsedTime + "ms" + " Speed: " + (String)speed + "mph");
      publishAda("Car detected: Time: " + (String)elapsedTime + "ms" + " Speed: " + (String)speed + "mph", 0);
    } else {
      Serial3.println("Measurement error");
    }

  } else {
    delay(50);
  }
}

Credits

juan pendas

juan pendas

1 project • 1 follower

Comments

Related channels and tags
  • Adafruit
  • Debugging
  • Internet of Things
  • Microchip