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4 Wire Resistive Touch Screen Controlled Wireless Wheel Chair with ATmega16 using 433MHz RF for Physically Handicapped
In this project, we will learn How to design a 4 Wire Resistive Touch Screen Controlled Wireless Wheel Chair with AVR ATmega16 Microcontroller using 433MHz RF for Physically Handicapped. Here, we will use the 4 wire resistive touch screen as the input device to drive the wheel chair in different direction and we will display the direction of movement of the wheel chair in a 16X2 alphanumeric LCD. The 433 MHz RF circuit will be used to drive the wheel chair wirelessly.
When we touch the touch screen, the outputs of the touch screen sensor changes and this change will be detected by the ATmega16 microcontroller. But the two outputs of touch screen are analog in nature, so these signals cannot be processed directly by the microcontroller. For this, we will use the ADC of the ATmega16 microcontroller to convert the analog signals to digital values. After converting the analog signals of touch screen to digital values, the ATmega16 microcontroller will process the digital values to know which key of the touch screen is touched. After knowing which key of the touch screen is touched, the ATmega16 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 direction of movement of the wheel chair 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 DC motor driver (L293D) of the wheel chair to drive the wheel chair in the desired direction.
The control touches 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, touch the touch screen at different position and drive your wheel chair as you want.
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Control Touchs |
Wheel Chair Direction |
|
2 |
Forward |
|
4 |
Left |
|
6 |
Right |
|
8 |
Backward |
|
5 |
Stop |
Softwares Required
Hardwares Required
Circuit Diagram
Video
Connection Guide
The step-by-step connection guide for 4 Wire Resistive Touch Screen Controlled Wireless Wheel Chair with ATmega16 using 433MHz RF for Physically Handicapped is as follows
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Steps - 1 ( 0f 20 )
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.
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Steps - 2 ( 0f 20 )
Connect PortB header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.
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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.
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Steps - 4 ( 0f 20 )
Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.
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Steps - 5 ( 0f 20 )
Connect PortC header of AVR Trainer Board-100 with RF Transmitter header of RF Transmitter Board with a 10 to 10 FRC Female Connector.
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Steps - 6 ( 0f 20 )
Connect the TE bar pin and GND of RF Transmitter Jumper header with a jumper.
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Steps - 7 ( 0f 20 )
Set the address of RF Transmitter to 0x00 with the help of 8 way DIP switch in RF Transmitter Board.
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Steps - 8 ( 0f 20 )
Connect the Pin1, Pin2, Pin3, Pin4 and VCC pins of 4 Wire Resistive Touch Screen Board with PA0, PA1, PA2, PA3 and VCC pins of PortA header of AVR Trainer Board-100 with 5 to 5 Connector.
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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.
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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.
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Steps - 11 ( 0f 20 )
Switch on the power with the help of Power Switch of AVR Trainer Board-100.
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Steps - 12 ( 0f 20 )
Download the 4 Wire Resistive Touch Screen Controlled Wireless Wheel Chair with ATmega16 using 433 MHz RF for Physically Handicapped Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.
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Steps - 13 ( 0f 20 )
Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of Power Supply Board.
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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.
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Steps - 15 ( 0f 20 )
Set the address of RF Receiver to 0x00 with the help of 8 way DIP switch in RF Receiver Board.
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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.
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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.
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Steps - 18 ( 0f 20 )
Connect the wheel chair connector to the Output header of the DC Motor Driver.
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Steps - 19 ( 0f 20 )
Switch off the Mode Switch of DC Motor Driver.
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Steps - 20 ( 0f 20 )
Switch on the power with the help of Power Switch of Power Supply Board.
Downloads
4 Wire Resistive Touch Screen Controlled Wireless Wheel Chair with ATmega16 using 433MHz RF for Physically Handicapped
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