ablab

Hello Readers, welcome to my Blog - A Blog For Bloggers By A Blogger. I'm Arun, an entrepreneur Blogger from India.

4X4 Keypad Controlled Wireless Wheel Chair with ATmega32 using 433MHz RF for Physically Handicapped

1167
Mark as Favourite

In this project, we will learn How to design a 4X4 Keypad Controlled Wireless Wheel Chair with AVR ATmega32 Microcontroller using 433MHz RF for Physically Handicapped. Here, we will use the 4X4 keypad as the input device and the 433MHz RF circuit to drive the wheel chair wirelessly in different direction. Also, we will display the direction of movement of the wheel chair in a 16X2 alphanumeric LCD. 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.

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 DC motor driver (L293D) of the wheel chair to drive the wheel chair in the desired direction. Also, the microcontroller will display the direction of movement of the wheel chair in a 16X2 alphanumeric LCD.

The control keys for the wheel chair are 2, 8, 4, 6 and 5 to drive the wheel chair in forward, backward, left, right direction and to stop it respectively. Now, press different keys of the 4X4 keypad and drive your wheel chair wirelessly as you want.

Control Keys Wheel Chair Direction
2 Forward
4 Left
6 Right
8 Backward
5 Stop

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega32 1pc
AVR USB Programmer 1pc
12V, 1A DC SMPS Adaptor 1pc
DC Motor Driver 1pc
4X4 Keypad 1pc
RG1602A 16X2 Alphanumeric LCD Green 1pc
433MHz RF Transmitter & Receiver Board 1pc
Power Supply Board 1pc
1 to 1 Connector-Female to Female 12pc
10 to 10 FRC Female to Female Connector 4pc
Wheel Chair 1pc

Circuit Diagram

Video

Connection Guide

The step-by-step connection guide for 4X4 Keypad Controlled Wireless Wheel Chair with ATmega32 using 433MHz RF for Physically Handicapped is as follows

  • Steps - 1 ( 0f 20 )

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

  • Steps - 2 ( 0f 20 )

    Connect PortA header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

  • Steps - 3 ( 0f 20 )

    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 20 )

    Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.

  • Steps - 5 ( 0f 20 )

    Connect PortC header of AVR Trainer Board-100 with Keypad header of 4X4 Keypad with a 10 to 10 FRC Female Connector.

  • Steps - 6 ( 0f 20 )

    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 - 7 ( 0f 20 )

    Connect the TE bar pin and GND of RF Transmitter Jumper header with a jumper.

  • Steps - 8 ( 0f 20 )

    Set the address of RF Transmitter to 0x00 with the help of 8 way DIP switch in RF Transmitter Board.

  • Steps - 9 ( 0f 20 )

    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 - 10 ( 0f 20 )

    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 20 )

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

  • Steps - 12 ( 0f 20 )

    Download the 4X4 Keypad Controlled Wireless Wheel Chair with ATmega32 using 433MHz RF for Physically Handicapped Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

  • Steps - 13 ( 0f 20 )

    Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of Power Supply Board.

  • Steps - 14 ( 0f 20 )

    Connect the 5V and GND pins of 5V header and GND header of Power Supply Board to VCC and GND pins of Input header of DC Motor Driver and RF Receiver header of RF Receiver Board with 1 to 1 Female Connectors.

  • Steps - 15 ( 0f 20 )

    Set the address of RF Receiver to 0x00 with the help of 8 way DIP switch in RF Receiver Board.

  • Steps - 16 ( 0f 20 )

    Connect the D8, D9, D10 and D11 pins of RF Receiver header of RF Receiver Board with I/P1, I/P2, I/P3 and I/P4 pins of Input header of DC Motor Driver with 1 to 1 Female Connectors.

  • Steps - 17 ( 0f 20 )

    Connect the 12V pin of PWM & Motor Voltage header of DC Motor Driver with the 12V header of Power Supply Board with a 1 to 1 Connector.

  • Steps - 18 ( 0f 20 )

    Connect the wheel chair connector to the Output header of the DC Motor Driver.

  • Steps - 19 ( 0f 20 )

    Switch off the Mode Switch of DC Motor Driver.

  • Steps - 20 ( 0f 20 )

    Switch on the power with the help of Power Switch of Power Supply Board.

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

    Steps - 1 ( 0f 20 )

  • Connect PortA header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

    Steps - 2 ( 0f 20 )

  • 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 20 )

  • Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.

    Steps - 4 ( 0f 20 )

  • Connect PortC header of AVR Trainer Board-100 with Keypad header of 4X4 Keypad with a 10 to 10 FRC Female Connector.

    Steps - 5 ( 0f 20 )

  • 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 20 )

  • Connect the TE bar pin and GND of RF Transmitter Jumper header with a jumper.

    Steps - 7 ( 0f 20 )

  • Set the address of RF Transmitter to 0x00 with the help of 8 way DIP switch in RF Transmitter Board.

    Steps - 8 ( 0f 20 )

  • 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 20 )

  • 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 20 )

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

    Steps - 11 ( 0f 20 )

  • Download the 4X4 Keypad Controlled Wireless Wheel Chair with ATmega32 using 433MHz RF for Physically Handicapped Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

    Steps - 12 ( 0f 20 )

  • Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of Power Supply Board.

    Steps - 13 ( 0f 20 )

  • Connect the 5V and GND pins of 5V header and GND header of Power Supply Board to VCC and GND pins of Input header of DC Motor Driver and RF Receiver header of RF Receiver Board with 1 to 1 Female Connectors.

    Steps - 14 ( 0f 20 )

  • Set the address of RF Receiver to 0x00 with the help of 8 way DIP switch in RF Receiver Board.

    Steps - 15 ( 0f 20 )

  • Connect the D8, D9, D10 and D11 pins of RF Receiver header of RF Receiver Board with I/P1, I/P2, I/P3 and I/P4 pins of Input header of DC Motor Driver with 1 to 1 Female Connectors.

    Steps - 16 ( 0f 20 )

  • Connect the 12V pin of PWM & Motor Voltage header of DC Motor Driver with the 12V header of Power Supply Board with a 1 to 1 Connector.

    Steps - 17 ( 0f 20 )

  • Connect the wheel chair connector to the Output header of the DC Motor Driver.

    Steps - 18 ( 0f 20 )

  • Switch off the Mode Switch of DC Motor Driver.

    Steps - 19 ( 0f 20 )

  • Switch on the power with the help of Power Switch of Power Supply Board.

    Steps - 20 ( 0f 20 )

Downloads

4X4 Keypad Controlled Wireless Wheel Chair with ATmega32 using 433MHz RF for Physically Handicapped
  • 2 downloads 0 Kb

Post a Comment