My M.tech project -2 :Remote Monitoring Electrical devices using IOT(Internet of Things

6. PROJECT: REMOTE MONITORING ELECTRICAL DEVICES USING BLUETOOTH

As IoT is the new trend in the market. The main blocks of IoT are :

1. Any wireless communication

2. MCU/MPU for processing and software tools and

3. Relays to control 220 volt AC signal electrical devices by 3.2 to 5 volt DC signal.

I have chosen Bluetooth wireless communication because if embedded devices are enabled with Wi-Fi and Bluetooth, they can communicate directly with a smartphone and it is cost effective. I have taken mbed LPC11U24 as it is cost effective and fast in comparison to 8051 and AVR microcontroller. It allow others feature such as analogin, analogout, PWMout, USB device, I2C, SPI, Ethernet etc.

 6.1 Block Diagram of IoT using Bluetooth

Fig 4: Block diagram of IoT using Bluetooth

6.2 Working Principle of IoT using Bluetooth

The Bluetooth module is being interface with MCU via serial pins (p5 & p6 in mbed LPC11U24 and 1 & 2 in Arduino) as shown in fig 4. When we give supply to Bluetooth module then Smartphone will detect it and we can paired with it. Now install Google Play app ‘BlueTerm’ on Android Smartphone and connect Bluetooth module with it as shown in fig 5 given below. This figure shows the display screen of Blueterm.

 This android application is similar to HyperTerminal in PC. When we send command to Bluetooth as it is serial communcaion, then microcontroller do work according to commands received by BlueTerm app. The LCP11U24 ARM works on 3.2 volt which is very low for relay so we require amplifying it by using transistors. The working of relay is described in next topic and fig 6.

Fig 5: Display Screen of BlueTerm on Smartphone

6.6 Flowchart

Fig 7: Flowchart of source code

7.2 Source code on mbed LPC11U24

#include<mbed.h>

Serial blue(p9,p10);          // HC05

AnalogIn ain20(p17);

DigitalOut myled(LED1);

DigitalOut led5(p5);

DigitalOut myled2(LED4);

DigitalOut led6(p6);

float ADCdata;

 int main()

{

    while (1)

    {

      if (blue.avialable())

      {

        if(blue.getc()=1)

        {

       blue.printf("  Red Bulb is ON please press '2' to OFF ");

             myled = 1;

            led5=1;

            }

         if(blue.getc()=2)

         {

           blue.printf("   Red Bulb is OFF please press '1' to ON ");

            myled=0;

            led5=0;

            }

         if(blue.getc()=3){

          blue.printf("   Green Bulb is ON please press '4' to OFF ");

            myled2=1;

            led6=1;}

          if(blue.getc()=4)

          {

         blue.printf("   Green Bulb is OFF please press '3' to ON ");

            myled2=0;

            led6=0;

            }

          if(blue.getc()=5)

          {

            blue.printf("   CHECK THE STATUS OF LEDS ");

            if(led5==1)

            blue.printf("   Red Bulb is ON please press '2' to OFF ");

            if(led5==0)

             blue.printf("   Red Bulb is OFF please press '1' to ON ");

             if(led6==1)

            blue.printf("   Green Bulb is ON please press '4' to OFF ");

            if(led6==0)

             blue.printf("  Green Bulb is OFF please press '3' to ON ");

            }

        }

    }

}