wireless remote control car

WIRELESS REMOTE CONTROL CAR

 REQUIREMENTS:   

                               1) ASK TRANSMITTER RECIEVER PAIR(100mhz

                                2) HT12E(ENCODER)  AND HT12D (DECODER)

                                3) 750K,33K (RESISTORS)

                               4) 0.01UF (CAPACITOR)

                               5) 2PIECES  9V  BATTERY

                              6) 4 PIECES OF WHEEL 7CM DIAMETER

                              7) 4 PIECES GEARED MOTOR 500RPM

                              8) A PIECE OF PLYWOOD(SQUARE)

 CIRCUIT DIAGRAM:

 

 FOR MAKING THE CHASIS FOLLOW http://modern-engineering.blogspot.in/2013/06/remote-controlled-wired-robot-car-one.html

 CIRCUIT EXPLANATION:

 

THE RED LINE IN THE CIRCUIT DIAGRAM IS THE ANTENNA.

PIN NO. 1-9 OF BOTH ENCODER AND DECODER IS GROUNDED SO THAT THE ADDRESS

OF BOTH ENCODER AND DECODER REMAINS THE SAME.

2 DPDT SWITCHES ARE REQUIRED

THE CONNECTION OF DPDT SWITCHES IS DRAWN IN THE DIAGRAM.

THE +VE OF THE SWITCH 1 IS CONNECTED TO D0 AND THE -VE IN D1

SIMILARLY THE +VE OF SWITCH 2 IS CONNECTED TO D2 AND THE -VE IN D3

PIN 14 IS ALSO GROUNDED.

DONT GET CONFUSED WITH THE +VE AND -VE OF SWITCHES WHICH IS TO BE CONNECTED TO THE 9V BATTERY.

SEE THE DIAGRAM CAREFULLY AND UNDERSTAND IT.

SAME 9VOLT BATTERY CAN BE USED FOR SWITCH AND TRANSMITTER CONNECTION.

IN THE TRANSMITTER AS WELL AS RECIEVER PART THAT IS HT12E & HT12D, A OSCILLATOR IS CONNECTED WITH PIN 15 AND 16 THEREAFTER THE RESISTORS ARE CONNECTED.

IN THE RECIEVER A434 PIN 6&7 IS SHORTED AND CONNECTED TO PIN 1 AND THEREAFTER GROUNDED.

PIN 2 IS CONNECTED TO PIN 14 OF HT12D

PIN 3 IS CONNECTED TO PIN 17 OF HT12D

PIN 4&5 IS SHORTED AND CONNECTED TO PIN 18 OF HT12D

OUTPUT FROM PIN 13 IS CONNECTED TO  +VE POINT OF BOTH THE WHEEL OF ONE SIDE OF CHASIS

 AND OUTPUT FROM PIN 12 IS CONNECTED TO -VE POINT OF BOTH THE WHEEL OF ONE SIDE OF CHASIS

OUTPUT FROM PIN 11 IS CONNECTED TO  +VE POINT OF BOTH THE WHEEL OF OTHER SIDE OF CHASIS

 AND OUTPUT FROM PIN 10 IS CONNECTED TO -VE POINT OF BOTH THE WHEEL OF OTHER SIDE OF CHASIS

  CONTROLLING OF CAR:

 SWITCH 1               SWITCH2                        MOTION

 FORWARD              FORWARD                       FORWARD

 BACKWARD           BACKWARD                    BACKWARD

FORWARD                OFF                                    RIGHT TURN

OFF                            FORWARD                        LEFT TURN

FORWARD                OFF                                      360 DEGREE TURN

  EXTRA THEORY:

  EVERY SIGNAL CAN BE TRANFERRED OVER THE SPACE IN A FORM OF 0 AND 1 WHERE 0 REPRESENTS LOW VOLTAGE AND 1 REPRESENT HIGH VOLTAGE.

HERE ENCODER ENCODES THE INSTRUCTION IN 0 AND 1 FORMAT AND THE DECODER AGAIN DECODES IT TO INSTRUCTIONS TO BE PERFORMED.

 TRANSMITTER IS THE ONE WHICH TRANSMITS THE ENCODED SIGNAL AND RECIEVER IS THE ONE WHICH RECIEVES THE TRASNMITTED SIGNAL.

THE TRANSMITTER   HAS 8 BIT ADDRESS BUS WHICH IS PIN NO. 1 TO 9

AND SIMILARLY RECIEVER HAS 8 BIT ADDRESS BUS FROM PIN NO. 1 TO 9.

SO HERE BOTH ARE GROUNDED FROM PIN 1 TO 9 SO THAT THE ADDRESS REMAINS THE SAME.

IF THE ADDRESS IS NOT SAME THEN THE SIGNAL TRANSMITTED IS NOT RECIEVED BY THE RECIEVER.
 

  FOR MORE KNOWLEDGE ON ENCODER,DECODER FOLLOW DIGITAL ELECTRONICS BOOK BY ANAND KUMAR OR RP JAIN.

AND FOR TRANSMITTER-RECIEVER  FOLLOW ANALOG COMMUNICATION BY BPLATHI &AK LATHI OR SANJAY SHARMA

 
  THE CIRCUIT IS MADE AND TESTED BY ME, IF YOU HAVE ANY PROBLEM REGARDING THE CIRCUIT THEN PLEASE COMMENT BELOW.

ratan.singh@ieee.org