Attention Makers


Travagus (GSM based mini tracked vehicle)

MAKERS: Muzaffar

Abstract: Travagus is a GSM based DIY project in which DTMF signals are decoded to control a vehicle in an area of a service provider. The cell phone attached to the vehicle acts as a receiver and the cell phone in users hand as a transmitter. By pressing the keypad keys during the calling process corresponding DTMF tones are generated by the transmitter. These tones are also heard at the receiver side. DTMF decoder decodes these tones into 4 bit codes, microcontroller processes them and sends them to motor driver which drive the motors forward or reverse. These motors are fitted into the designed tracked vehicle to control its movement and its steering. The mini tracked vehicle can act as UGV (Unmanned Ground Vehicle) and may serve for industrial and military purposes. Main Components: - Cell Phone - MT8870 (DTMF Decoder) - ATmega16A (Microcontroller) - L293D (Motor Driver) - Motors - Batteries - Diodes - Capacitors - Resistors Software Used: - Proteus - AVR Studio - AutoCAD Programming: C language is used in microcontroller coding. Important Steps used in coding are as follows: First declare port A as input port by using command DDRA=00x0. Declare port D as output port by using DDRD=0xFF.Command PINA is used to read the data from port A. Use while loop to run program infinitely. Under while loop check the received input cases by using switch statement and show the corresponding output at port D. Use command PORTD to output data on port D. Make a hex file by using AVR Studio 4 compiler. Simulate the microcontroller by adding the hex file using Proteus software. After that burn the hex file on the microcontroller. Chassis Design: Parts which are available in a very low price from market and use in everyday life are deployed to design chassis of the vehicle. These parts are as follows: - Acrylic sheet - Chains and Rubber pipe - Gears - Nuts and Screws Problems Faced in designing: First problem was faced during decoding of DTMF signals. It was very difficult to decide which wire in the stereo head phone will act as a ring and a tip as there are no details given about the headphone cable. Cable has four thin wires in it. Red, blue, green and golden. So after hit and trial it was find that blue wire is a tip and green wire is a ring. Second and last problem occurred during the simulation of the code. Two components used in the main circuit e.g. DTMF decoder and motor driver are not present in the Proteus software. The solution to this problem was to use the pull up resistors on the input Port A of microcontroller and to connect the DC motors directly to the output Port D of the microcontroller. Link: Video Link: This project is designed single handedly. Muzaffar Ali Pakistan

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