Sample Codes

Password Protected Accelerometer based Hand Gesture Controlled Wheel Chair with ATmega32 for Physically Handicapped

Mark as Favourite

In this project, we will learn How to design Password Protected Accelerometer based Hand Gesture Controlled Wheel Chair with AVR ATmega32 Microcontroller for Physically Handicapped. Here, we will use our hand gestures as input signal to enter the password and to drive the wheel chair in different direction i.e here the hand gestures means tilting the hand in different direction. T

he password is a fixed sequence of four hand gestures. In our case the password is “Forward tilt, backward tilt, left tilt, right tilt” respectively which can be changed in the program. To gain access of the wheel chair control, the user has to enter the correct password. To detect different hand gestures, we will use the ADX335 accelerometer sensor. The sensor will be attached to our hand with some material or through a hand glove. The three output signals of accelerometer sensor are analog in nature and it cannot be processed directly by ATmega32 microcontroller for processing. For this, we will use the ADC of the ATmega32 microcontroller to convert the analog signals to digital values. First the user will enter the password, each hand gesture of which will be displayed in a 16X2 alphanumeric LCD as star(*) and 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 receive the wheel chair control signal from the accelerometer and it will process the control signal to know which hand gesture is applied. Once the hand gesture is known, the ATmega32 microcontroller will send the required control signal to the DC motor driver (L293D) of the wheel chair to drive the wheel chair in the desired direction and it will display the direction of movement of the wheel chair in the 16X2 alphanumeric LCD also.

The control hand gestures for the wheel chair are forward tilt, backward tilt, left tilt, right tilt and no tilt to drive the wheel chair in forward, backward, left, right direction and to stop it respectively. Now, tilt your hand in different direction and drive your wheel chair as you want.

Control Hand Gestures	Wheel Chair Direction
Forward Tilt	Forward
Left Tilt	Left
Right Tilt	Right
Backward Tilt	Backward
no Tilt	Stop

Softwares Required

• Atmel Studio 6 Software
• SinaProg Hex Downloader Software
• USBasp Driver

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
3-axis Accelerometer Sensor	1pc
RG1602A 16X2 Alphanumeric LCD Green	1pc
1 to 1 Connector-Female to Female	4pc
LM7812	1pc
10 to 10 FRC Female to Female Connector	3pc
Wheel Chair	1pc

Video

Connection Guide

The step-by-step connection guide for Password Protected Accelerometer based Hand Gesture Controlled Wheel Chair with ATmega32 for Physically Handicapped is as follows