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
thank you so much sir..
ReplyDeletei am confused wid da word "ground", does it really goes to ground or is the -ve of da circuit ??
and if i want to control all the motors independently then how wud da new mechanism of the switch board and the new circuit look like ??
ReplyDeletei really need both da circuits, thanx 4 dis 1 nd i also need da 2nd 1.. plz plz plz help.. :-O
one more thing sir, i am confused about the ground area of the encoder as well as the decoder that wheather i have to connect the -ve of the battery to it or not including the -ve of the capacitor
ReplyDeleteground means negative of 9volt
ReplyDeleteonly 2 9volt battery is used one at tranmitter-encoder side other at reciever-decoder side
all light green color boxes are grounded that is connected to negative of 9v
pin 15&16 of both encoder and decoder musst be connected by a crystal oscillator of 1mhz.
the skyblue color box is the crystal oscillator the circuit has a error that is the oscillator is not drawn in decoder.
if you want to control it with four switches then in encoder side connect positive of four simple on-off switch to four inputs D0.D1,D2,D3 and their negatives to ground
ReplyDeleteand connect the output pins 10,11,12,13 to positive of four motors and negative of every motor to ground.
switch 1 and switch 2 should be crossly connected so that motor can be revolved backward and forward as desired
switch 3 and switch 4 should be also crossly coulpled.
it is better to use dpdt switches because it is easier to implement and control and is specially made for robotics purpose.it minimize the circuit complexity.
i would suggest you to use dpdt switches because you can implement it very easily.
and the circuit with four switches will be published soon keep in touch with updates of blog.