In this project, we will learn How to design a Relay based 4X4 Keypad Controlled Wireless Home Automation System with AVR ATmega32 microcontroller using 433MHz RF Part-I. Here, we will use the 4X4 keypad as the input device to control the appliances i.e 2 bulbs and 2 fans.
The ATmega32 microcontroller will read the 4X4 keypad output. After reading the 4X4 keypad output, the ATmega32 microcontroller will process the keypad output value to find pressed key value. According to the pressed key value, the ATmega32 microcontroller will send the required 4 bit signal to the HT12E encoder of RF transmitter circuit. The HT12E will encode the 8 bit address and 4 bit data given to it and then it will transmit the encoded signal serially to the RF module. The RF module will transmit the encoded data and address wirelessly. Also, the microcontroller will display the status of the appliances in the 16X2 alphanumeric LCD.
At the receiver end, the RF receiver module will receive the encoded 4 bit data and 8 bit address. Then, it will transmit the encoded signal serially to the HT12D decoder which will decode the received signal to 8 bit address and 4 bit data. After decoding, the HT12D will compare the received 8 bit address with its local 8 bit address. If the received address and the local address are same, then the received 4 bit data is sent to its output pins else the received data is discarded. The 4 bit output of HT12D is sent to the Quad Relay Driver to turn on and off appliances.
Here, we will use 2 keys of the Keypad to control one appliance. One key will be used to turn on and the other key will be used to turn off the appliance. So, for four appliances, we will use 8 keys of the keypad. Apart from these 8 keys, we will use 2 more keys to turn on and off all appliances at a time. Now, press different keys of the 4X4 keypad and control your appliances.
The step-by-step connection guide for Relay based 4X4 Keypad Controlled Wireless Home Automation System with ATmega32 using 433MHz RF-I is as follows
Steps - 1 ( 0f 21 )
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.
Steps - 2 ( 0f 21 )
Connect PortA header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.
Steps - 3 ( 0f 21 )
Connect RS, RW & EN pins of LCD control header with PD0, PD1 & PD2 pins of PortD header respectively in AVR Trainer Board-100 with 1 to 1 Connectors.
Steps - 4 ( 0f 21 )
Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.
Steps - 5 ( 0f 21 )
Connect PortB header of AVR Trainer Board-100 with RF Transmitter header of RF Transmitter Board with a 10 to 10 FRC Female Connector.
Steps - 6 ( 0f 21 )
Connect the TE bar pin and GND of RF Transmitter Jumper header with a jumper.
Steps - 7 ( 0f 21 )
Set the address of RF Transmitter to 0x00 with the help of 8 way DIP switch in RF Transmitter Board.
Steps - 8 ( 0f 21 )
Connect PortC header of AVR Trainer Board-100 with Keypad header of 4X4 Keypad with a 10 to 10 FRC Female Connector.
Steps - 9 ( 0f 21 )
Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR
Steps - 10 ( 0f 21 )
USB Programmer with a 10 to 10 FRC Female Connector.
Steps - 11 ( 0f 21 )
Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.
Steps - 12 ( 0f 21 )
Switch on the power with the help of Power Switch of AVR Trainer Board-100.
Steps - 13 ( 0f 21 )
Download the Relay based Keypad Controlled Wireless Home Automation System with ATmega32 using 433 MHz RF-I Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.
Steps - 14 ( 0f 21 )
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of Power Supply Board.
Steps - 15 ( 0f 21 )
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 Power Supply Board with 1 to 1 Connectors.
Steps - 16 ( 0f 21 )
Connect the A1, A2, A3 and A4 pins of Relay Control header of Quad Relay Driver with D8, D9, D10 and D11 pins of RF Receiver header of RF Receiver Board respectively with 1 to 1 Connectors.
Steps - 17 ( 0f 21 )
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 - 18 ( 0f 21 )
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 - 19 ( 0f 21 )
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 - 20 ( 0f 21 )
Connect the 5V and GND pins of 5V header and GND header of Power Supply Board to VCC and GND pins of RF Receiver header of RF Receiver Board with 1 to 1 Female Connectors.
Steps - 21 ( 0f 21 )
Set the address of RF Receiver to 0x00 with the help of 8 way DIP switch in RF Receiver Board.
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.
Steps - 1 ( 0f 21 )
Connect PortA header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.
Steps - 2 ( 0f 21 )
Connect RS, RW & EN pins of LCD control header with PD0, PD1 & PD2 pins of PortD header respectively in AVR Trainer Board-100 with 1 to 1 Connectors.
Steps - 3 ( 0f 21 )
Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.
Steps - 4 ( 0f 21 )
Connect PortB header of AVR Trainer Board-100 with RF Transmitter header of RF Transmitter Board with a 10 to 10 FRC Female Connector.
Steps - 5 ( 0f 21 )
Connect the TE bar pin and GND of RF Transmitter Jumper header with a jumper.
Steps - 6 ( 0f 21 )
Set the address of RF Transmitter to 0x00 with the help of 8 way DIP switch in RF Transmitter Board.
Steps - 7 ( 0f 21 )
Connect PortC header of AVR Trainer Board-100 with Keypad header of 4X4 Keypad with a 10 to 10 FRC Female Connector.
Steps - 8 ( 0f 21 )
Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR
Steps - 9 ( 0f 21 )
USB Programmer with a 10 to 10 FRC Female Connector.
Steps - 10 ( 0f 21 )
Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.
Steps - 11 ( 0f 21 )
Switch on the power with the help of Power Switch of AVR Trainer Board-100.
Steps - 12 ( 0f 21 )
Download the Relay based Keypad Controlled Wireless Home Automation System with ATmega32 using 433 MHz RF-I Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.
Steps - 13 ( 0f 21 )
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of Power Supply Board.
Steps - 14 ( 0f 21 )
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 Power Supply Board with 1 to 1 Connectors.
Steps - 15 ( 0f 21 )
Connect the A1, A2, A3 and A4 pins of Relay Control header of Quad Relay Driver with D8, D9, D10 and D11 pins of RF Receiver header of RF Receiver Board respectively with 1 to 1 Connectors.
Steps - 16 ( 0f 21 )
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 - 17 ( 0f 21 )
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 - 18 ( 0f 21 )
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 - 19 ( 0f 21 )
Connect the 5V and GND pins of 5V header and GND header of Power Supply Board to VCC and GND pins of RF Receiver header of RF Receiver Board with 1 to 1 Female Connectors.
Steps - 20 ( 0f 21 )
Set the address of RF Receiver to 0x00 with the help of 8 way DIP switch in RF Receiver Board.
Steps - 21 ( 0f 21 )
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Relay based 4X4 Keypad Controlled Wireless Home Automation System with ATmega32 using 433MHz RF-I
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Relay based 4X4 Keypad Controlled Wireless Home Automation System with ATmega32 using 433MHz RF-I
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