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Password Protected DTMF and Relay based Mobile/Cellphone Controlled Home Automation System with ATmega16-II

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In this project, we will learn How to design a password protected DTMF and relay based mobile/cellphone controlled Home Automation system with AVR ATmega16 microcontroller Part-II. Here, we will use mobile keypad as the input device to enter the password and to control the appliances i.e. 2 bulbs and 2 fans. Also, we will display the status of the appliances in a 16X2 alphanumeric LCD. The password is a 4 digit number. In our case, the password is “1234” which can be changed in the program. To gain access of the system, the user has to enter the correct password.

In our project, we will use two mobiles, one will be connected with the DTMF circuit and another will used to call the mobile attached with DTMF circuit. The mobile attached with DTMF circuit will be kept in auto-answering mode. The password can be entered and the appliances can be controlled from mobile attached to the DTMF circuit by pressing its keys and also from any other mobile by calling to the mobile attached with DTMF circuit and pressing keys from the calling mobile keypad.

The microcontroller will read the DTMF output through an external interrupt because the output of DTMF is latched in its output pins and the latched output cannot be used for entering password and for controlling appliances. First the user will enter the 4 digit password, each digit of which will be displayed in a 16X2 alphanumeric LCD as star(*). The microcontroller will compare the entered password with the set password. The system will ask to enter password till the correct password is entered by the user. After the correct password is entered, the microcontroller will read the appliance control signal from DTMF decoder and it will process the control signal to know which key of the mobile keypad is pressed. After knowing which key of the mobile keypad is pressed, the ATmega16 microcontroller will send the required control signal to the Quad Relay Driver to turn on and off appliances. Also, the microcontroller will display the status of the appliances in a 16X2 alphanumeric LCD.

Here, we will use one key of the mobile keypad to control one appliance. Same key will be used to turn on and off the appliance. Each time we press the same key, the appliance changes its status. So, for four appliances, we will use 4 keys of the mobile keypad. Apart from these 4 keys, we will use 2 more keys to turn on and off all appliances at a time. Now, press different keys from both the mobile and control your appliances as you want.

Control Keys

Appliance Status Change

1

Appliance 1 On/Off

2

Appliance 2 On/Off

3

Appliance 3 On/Off

4

Appliance 4 On/Off

5

All Appliances On

6

All Appliances Off

 

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega16 1pc
AVR USB Programmer 1pc
12V, 1A DC SMPS Adaptor 1pc
Quad Relay Driver 1pc
DTMF Decoder 1pc
RG1602A 16X2 Alphanumeric LCD Green 1pc
Home Appliance Board 1pc
3.5mm Audio Jack with Connector 1pc
1 to 1 Connector-Female to Female 9pc
10 to 10 FRC Female to Female Connector 3pc

Circuit Diagram

Video

Connection Guide

The step-by-step connection guide for Password Protected DTMF and Relay based Mobile/Cellphone Controlled Home Automation System with ATmega16-II is as follows

  • Steps - 1 ( 0f 12 )

    Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.

  • Steps - 2 ( 0f 12 )

    Connect the 12V and GND pins of Relay Control header of Quad Relay Driver with the 12V and GND pins of 12V and GND header of AVR Trainer Board-100 with 1 to 1 Connectors.

  • Steps - 3 ( 0f 12 )

    Connect the A1, A2, A3 and A4 pins of Relay Control header of Quad Relay Driver with PB0, PB1, PB2 and PB3 pins of PORTB header of AVR Trainer Board-100 respectively with 1 to 1 Connectors.

  • Steps - 4 ( 0f 12 )

    Connect the Neutral and Phase of AC Supply from Wall to N and PH of AC Input Terminal Blocks of Quad Relay Driver with wires.

  • Steps - 5 ( 0f 12 )

    Connect the Neutrals of 2 Bulbs and 2 Fans to the N pin of AC Output Terminal Blocks of Quad Relay Driver with wires.

  • Steps - 6 ( 0f 12 )

    Connect the Phases of 2 Bulbs and 2 Fans to the PH1, PH2, PH3 and PH4 pins of AC Output Terminal Blocks of Quad Relay Driver respectively with wires.

  • Steps - 7 ( 0f 12 )

    Connect the PortD header of AVR Trainer Board-100 with the DTMF header of DTMF Decoder with a 10 to 10 FRC Female Connector.

  • Steps - 8 ( 0f 12 )

    Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.

  • Steps - 9 ( 0f 12 )

    Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.

  • Steps - 10 ( 0f 12 )

    Switch on the power with the help of Power Switch of AVR Trainer Board-100.

  • Steps - 11 ( 0f 12 )

    Download Password Protected DTMF and Relay based Mobile/Cellphone Controlled Home Automation System with ATmega16-II Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

  • Steps - 12 ( 0f 12 )

    Press different keys from the mobile and see the output.

  • Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.

    Steps - 1 ( 0f 12 )

  • Connect the 12V and GND pins of Relay Control header of Quad Relay Driver with the 12V and GND pins of 12V and GND header of AVR Trainer Board-100 with 1 to 1 Connectors.

    Steps - 2 ( 0f 12 )

  • Connect the A1, A2, A3 and A4 pins of Relay Control header of Quad Relay Driver with PB0, PB1, PB2 and PB3 pins of PORTB header of AVR Trainer Board-100 respectively with 1 to 1 Connectors.

    Steps - 3 ( 0f 12 )

  • Connect the Neutral and Phase of AC Supply from Wall to N and PH of AC Input Terminal Blocks of Quad Relay Driver with wires.

    Steps - 4 ( 0f 12 )

  • Connect the Neutrals of 2 Bulbs and 2 Fans to the N pin of AC Output Terminal Blocks of Quad Relay Driver with wires.

    Steps - 5 ( 0f 12 )

  • Connect the Phases of 2 Bulbs and 2 Fans to the PH1, PH2, PH3 and PH4 pins of AC Output Terminal Blocks of Quad Relay Driver respectively with wires.

    Steps - 6 ( 0f 12 )

  • Connect the PortD header of AVR Trainer Board-100 with the DTMF header of DTMF Decoder with a 10 to 10 FRC Female Connector.

    Steps - 7 ( 0f 12 )

  • Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.

    Steps - 8 ( 0f 12 )

  • Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.

    Steps - 9 ( 0f 12 )

  • Switch on the power with the help of Power Switch of AVR Trainer Board-100.

    Steps - 10 ( 0f 12 )

  • Download Password Protected DTMF and Relay based Mobile/Cellphone Controlled Home Automation System with ATmega16-II Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

    Steps - 11 ( 0f 12 )

  • Press different keys from the mobile and see the output.

    Steps - 12 ( 0f 12 )

Downloads

Password Protected DTMF and Relay based Mobile/Cellphone Controlled Home Automation System with ATmega16-II Project File
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