There have been a few important things that could not be
covered due to shortage
of time. They have been explained as follows.
--As
the receivers output are not powerful enough (only 6V) to drive DC motors of
12V
directly we need some kind of drivers. A very easy and safe method is to use
popular
L293D
chips.
--NOTE:
We use 12V dc motors as they are available readily in the market with a gear
box
of
different rpm attached to it, thus providing robust drives.
This
IC is known as a motor driver IC. Its working is like a relay module. As you
can
see in the figure the voltage to drive the 12V motors is to be supplied at the
pin no. 8
and
hence the positive of the 12V battery is to be connected directly to the pin
no. 8. The
enable
1 and 2 require 6 volts (in our case) to enable the drive of the LHS and RHS
motor
respectively.
Only after that, the motor can be driven with the help of the pulses that
would
be given to the IC through the receiver module to the pins 2, 7, 10 and 15. For
example,
if pulse (6V in our case) is given to pin no. 2, then 12V would be the output
from
pin no. 3 and similarly if pulse is not given the pin no. 3 would act as a
ground.
Thus,
input pulse at pin 2 would rotate the motor in one direction while input
pulse
at 7 would rotate the same motor in opposite direction when the other input is
at
ground
level.
--The
reason is that a potential difference of 12V is generated between 3 and 6 no.
output
pins to rotate the DC motor.
1)
12P - pin 8 - A
2)
12N - B - (pin 4 or 5 or 12 or 13) - G
3)
C - V - pin 1 - pin 16 - pin 9
4)
M1+ - pin 2
5)
M1- - pin 7
6)
M2+ - pin 15
7)
M2- - pin 10
8)
p1 – pin 3
9)
n1 – pin 6
10)
p2 – pin 14
11)
n2 – pin 11
--------see the connection and make sure that all the connection is true and perfect ?
best of luck for making wireless robot...
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