celphone operated land rover robot

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, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called DTMF (dual-tone-multiple-frequency). The robot perceives this DTMF tone with the help of the phone stacked in the robot. The received tone is processed

by the ( ATmega16 ) microcontroller with then help of DTMF decoder MT887. The decoder decodes the DTMF tone into its equivalent binary digit and this binary number is sent to the microcontroller. The microcontroller is programmed to take a decision for any given input and outputs its decision to motor drivers in order to drive the motors in forward direction or backward direction or turn. The mobile phone that makes a call to mobile phone stacked in the robot act as a remote. so this robotic project es not require the construction of receiver and transmitter units. The important components of this robot are a DTMF decoder, microcontroller and motor driver. An MT8870 series DTMF decoder is used here. All types of the MT8870 series use digitalcounting techniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output. The built-in dial tone rejection circuit eleminates the need of pre-filtering. when the input signalgiven at pin 2(IN-) in single-ended input configuration is recognised to be effective, the correct4-bit decode signal of the DTMF tone is transferred to (pin11) through (pin14) outputs. The pin11 to pin14 of DTMF decoder are connected to the pins of microcontroller (pa0 to pa3). The ATmega16 is a low power, 8-bit CMOS microcontroller based on the AVR enhanced RISCarchitecture. it provides the following features: 16kb of in-system programmable flash programmemory with read-while-write capabilities,...

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