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MOBILE CONTROLLED ROBOT (Works with or without android phone)

TITLE:
Bluetooth enabled mobile controlled robot

CIRCUIT DIAGRAM:



COMPONENTS LIST:
  • Battery 12v.
  • Wires for connection.
  • DTMF IC cm8870 or mt8870
  • Motor driver ic L293D
  • Bluetooth headset
  • A mobile phone with bluetooth facility in it.
  • 7805 voltage regulator ic
DESCRIPTION:
  • This is a simple mobile controlled robot project. In this project user can control robots just by specific set of keys.
  • First Bluetooth enabled phone is connected to Bluetooth headset like normally its done. When key on mobile is pressed then according to following table different frequency is generated by phone.
1209 Hz
1336Hz
1477Hz
1633 Hz
697 Hz
1
2
3
A
770 Hz
4
5
6
B
852 Hz
7
8
9
C
941 Hz
*
0
#
D
  • These are also called as DTMF tones which are heard / received by bluetooth headphones. These tones are then passed to DTMF decoder IC(CM8870 / MT8870). Received tones are decoded into binary of the number pressed on phone.
  • For example if 1 is pressed then 0001 data comes as output. Here pin 11 will be high and pins 12,13,14 will be low.
  • If 2 is pressed then 0010 data comes as output.Here pin 12 will be high and pins 11,13,14 will be low and so on can drive the complete robot.

Binary data
Numerical value
Description
0000
0
(STOP)
0110
6
(FORWARD)
1001
9
(REVERSE)
1010
*
(LEFT)
0101
5
(RIGHT) 
.
         [  Note that for FORWARD,REVERSE,LEFT and RIGHT, phone keypad buttons may vary                          depending on motor connections. ]

APPLICATIONS:

  • This project can be used at homes to serve tea /coffee etc to guests, to serve to employees in companies etc.
  • This can also be used in places like hotels where this trolley shaped robot carries customer’s order to their table.
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