THE MOTOR DRIVE SYSTEM
Hello again. Earlier we discussed about the sensor panel of the line following bot and from this article I'm going to explain about the motor drive system of this bot.
Here the motor drive
system is based on the L298 IC. L298 IC is a high
voltage, high current dual full-bridge
driver. Two separate motors can be connected to these two H-Bridges.
Figure 1 - L298 IC
Figure 2– H- Bridge
Figure 3- Motor Drive Circuit
connected to L298 IC
Here there
are two separate input couples for the two motors. And along with the inputs,
there are two enable pins to operate the two motors. Two enable inputs are provided to enable or
disable the device independently of the input signals. i.e. even though In1 and In2 receive logic ‘1’, the motor
still does not operate until EnA enable pin receives a logic ‘1’.
Motor Behavior
|
||
EnA = 1
|
In1 = 1 In2 = 0
In1 = 0 In2 = 1
In1 = In2
|
Turn to Right
Turn to Left
Sudden Stop
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EnA = 0
|
In1 = 1 or 0
In2 = 1 or 0
|
The motor
rotates freely or stay at rest
|
Here In1,In2 and EnA inputs are to control motor 1. The motor 2 is
controlled by In3,In4 and EnB. Two outputs from Pin2 and Pin3 of the IC are
taken to connect motor1 and motor 2 is connected to the outputs taken from Pin
13 and Pin 14. When connecting these outputs taken from the IC to the motor,
D1, D2, D3 and D4 free willing diodes also should be connected to the motor.
For this purpose fast recovery diodes should be selected. Here we have used
1N4148 diodes.
Figure 4 –The Final Motor Driver Circuit
From the female ports included in the
circuit as shown, the two motors and inputs can be connected.
So I guess you got some idea about the motor drive system and thank you for reading.
