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Accelerometer based Hand Gesture Controlled Wireless Robot with ATmega16 using 433MHz RF

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In this project, we will learn How to design an accelerometer based hand gesture controlled wireless robot with AVR ATmega16 microcontroller using 433MHz RF circuit. Here, we will use our hand gestures as input signals and the 433MHz RF circuit to drive the robot wirelessly in different direction and we will display the direction of movement of the robot in a 16X2 alphanumeric LCD. In our case, hand gesture means tilt of hand in different direction.

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 ATmega16 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 accelerometer sensor to digital values, the ATmega16 microcontroller will process the digital values to find different gestures of the hand. Once the hand gesture is known, 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 robot 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 robot to drive the robot in the desired direction.

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

Control Hand Gestures	Robot 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 ATmega16	1pc
AVR USB Programmer	1pc
12V, 1A DC SMPS Adaptor	2pc
DC Motor Driver	1pc
3-axis Accelerometer Sensor	1pc
RG1602A 16X2 Alphanumeric LCD Green	1pc
Robot V 4.0	1pc
433MHz RF Transmitter & Receiver Board	1pc
Power Supply Board	1pc
1 to 1 Connector-Female to Female	12pc
5 to 5 Connector-Female to Female-1 Meter	1pc
10 to 10 FRC Female to Female Connector	3pc

Video

Connection Guide

The step-by-step connection guide for Accelerometer based Hand Gesture Controlled Wireless Robot with ATmega16 using 433MHz RF is as follows