Cell Phone Operated Land Rover
ConstruCtion
CellPhone-oPeRated land RoveR
P RaghavendRa PRaSad and . K. SuSRam Rahul
C
onventionally, wireless-controlled robots use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantages of robust control, working range as large as the coverage area of the service provider,
no interference with other controllers and up to twelve controls. Although the appearance and capabilities of robots vary vastly, all robots share the features of a mechanical, movable structure under some form of control. The control of robot involves three distinct phases: preception, processing and action. Generally, the preceptors are sensors mounted on the robot, processing is done by the on-board microcontroller or processor, and the task (action) is performed using motors or with some other actuators.
Parts List
Semiconductors: IC1 - MT8870 DTMF decoder IC2 - ATmega16 AVR microcontroller IC3 - L293D motor driver IC4 - 74LS04 NOT gate D1 - 1N4007 rectifier diode Resistors (all ¼-watt, ±5% carbon): R1, R2 - 100-kilo-ohm R3 - 330-kilo-ohm R4-R8 - 10-kilo-ohm Capacitors: C1 - 0.47µF ceramic disk C2, C3, C5, C6 - 22pF ceramic disk C4 - 0.1µF ceramic disk Miscellaneous: XTAL1 XTAL2 S1 M1, M2 Batt. 3.57MHz crystal 12MHz crystal Push-to-on switch 6V, 50-rpm geared DC motor - 6V, 4.5Ah battery -
Project overview
In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed,
Fig. 1: Block diagram of cellphone-operated land rover
a tone corresponding to the button pressed is heard at the other end of the call. This tone is called ‘dual-tone multiple-frequency’ (DTMF) tone. The robot perceives this DTMF tone
Fig. 2: Circuit diagram of microcontroller-based cellphone-operated land rover
6 2 • j u ly 2 0
CellPhone-oPeRated land RoveR
P RaghavendRa PRaSad and . K. SuSRam Rahul
C
onventionally, wireless-controlled robots use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantages of robust control, working range as large as the coverage area of the service provider,
no interference with other controllers and up to twelve controls. Although the appearance and capabilities of robots vary vastly, all robots share the features of a mechanical, movable structure under some form of control. The control of robot involves three distinct phases: preception, processing and action. Generally, the preceptors are sensors mounted on the robot, processing is done by the on-board microcontroller or processor, and the task (action) is performed using motors or with some other actuators.
Parts List
Semiconductors: IC1 - MT8870 DTMF decoder IC2 - ATmega16 AVR microcontroller IC3 - L293D motor driver IC4 - 74LS04 NOT gate D1 - 1N4007 rectifier diode Resistors (all ¼-watt, ±5% carbon): R1, R2 - 100-kilo-ohm R3 - 330-kilo-ohm R4-R8 - 10-kilo-ohm Capacitors: C1 - 0.47µF ceramic disk C2, C3, C5, C6 - 22pF ceramic disk C4 - 0.1µF ceramic disk Miscellaneous: XTAL1 XTAL2 S1 M1, M2 Batt. 3.57MHz crystal 12MHz crystal Push-to-on switch 6V, 50-rpm geared DC motor - 6V, 4.5Ah battery -
Project overview
In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed,
Fig. 1: Block diagram of cellphone-operated land rover
a tone corresponding to the button pressed is heard at the other end of the call. This tone is called ‘dual-tone multiple-frequency’ (DTMF) tone. The robot perceives this DTMF tone
Fig. 2: Circuit diagram of microcontroller-based cellphone-operated land rover
6 2 • j u ly 2 0