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Cellphone Controlled Robot
Cellphone Controlled Robot

Cellphone controlled Robot

The mobile handset which is shown there is used to control the robot. We make a call to the handset which is placed inside the robot, the robot then automatically accepts the call and then we have to press each key to control the motion of the robot, which is controlled with the help of microcontroller associated with it. The robot can be reset with the help of the external reset switch. Each switch is allotted for each operation. When the key corresponding to the motion of the robot is pressed, the DTMF decoder will decode the tone generated at the receiver and sends the binary code to the microcontroller. The microcontroller is programmed in such a way that when the binary codes corresponding to the motion are detected, the microcontroller will give the corresponding binary input to the motor driver. The motor driver will interpret the signal and will give the motor appropriate voltages thereby switches it and rotates the motor in the corresponding direction.

HARDWARE REQUIREMENTS

  1. M8870 DTMF decoder
  2. Microcontroller
  3. L293D Motor Driver
  4. DC Motors
  5. Robot car structure kit
  6. Cell phone
  7. 5v Regulated power supply

 

DTMF DECODER:

The M8870 is a full DTMF Receiver that integrates both the band split filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-8870 offers low power consumption (35 mW max) and precise data handling. Its filter section uses switched capacitor technology for both the high and low group filters and for dial tone rejection. Its decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. External component count is minimized by the provision of an on-chip differential input amplifier, clock generator, and latched tri-state interface bus. Minimal external components required include a low-cost 3.579545 MHz color burst crystal, a timing resistor, and a timing capacitor. The M-8870-02 provides a “power-down” option which, when enabled, drops consumption to less than 0.5 mW. The M-8870-02 can also inhibit the decoding of fourth column digits.

 

Features of M8870:

  • Complete DTMF Receiver
  • Low power consumption (35mw)
  • Internal gain setting amplifier
  • Adjustable acquisition and release times
  • Central office quality
  • Power-down mode (5mw)
  • Single 5 Volt power supply
  • Dial tone suppression
  • Inhibit mode

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