L293D Dual H-Bridge Motor Driver

L293D is a dual H-Bridge motor driver, So with one IC we can interface two DC motors which can be controlled in both clockwise and counter clockwise direction and if you have motor with fix direction of motion the you can make use of all the four I/Os to connect up to four DC motors. L293D has output current of 600mA and peak output current of 1.2A per channel. Moreover for protection of circuit from back EMF ouput diodes are included within the IC. The output supply (VCC2) has a wide range from 4.5V to 36V, which has made L293D a best choice for DC motor driver.

A simple schematic for interfacing a DC motor using L293D is shown below.

L293D H-Bridge driver

As you can see in the circuit, three pins are needed for interfacing a DC motor (A, B, Enable). If you want the o/p to be enabled completely then you can connect Enable to VCC and only 2 pins needed from controller to make the motor work.

As per the truth mentioned in the image above its fairly simple to program the microcontroller. Its also clear from the truth table of BJT circuit and L293D the programming will be same for both of them, just keeping in mind the allowed combinations of A and B. We will discuss about programming in C as well as assembly for running motor with the help of a microcontroller.

Conversation

ExperimenterUK
Sat Sep 13 2014, 12:34 PM
jaimin1212,Pimpalkhare Create a thread for your question
jaimin1212
Sat Sep 13 2014, 02:35 AM
i want to make self balancing robot using MPU6050 using atmega8.. please help to get data of gyro and accelerometer from this sensor through atmega8.
Thu Sep 11 2014, 09:00 AM
Sunil Pimpalkhare
Hello sir, I am trying to make Wearfin project https://www.youtube.com/watch?v=iZ6PVBvQf-g so can u help me in teaching how to built the program???
Thu Sep 11 2014, 02:21 AM
hariom panday
plz hlp me in my project
iec.naga
Tue Sep 09 2014, 01:19 AM
spi
Mon Sep 08 2014, 08:14 AM
fameem
water changing in fish tank automatically using microcontoller with timer. send idea to me
dexter_a
Sat Sep 06 2014, 11:09 AM
hello guys
Sat Sep 06 2014, 10:10 AM
munaxa
plx guide me
Sat Sep 06 2014, 10:09 AM
munaxa
hi i want to buy plx guie me
ajay_bhargav
Sat Sep 06 2014, 03:10 AM
@Ben, Its hard to undrstand the context like this. If you can post in forum with some example code we might answer you better.

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piku_123
Tue Sep 16 2014, 11:29 AM
qudor
Tue Sep 16 2014, 11:06 AM
sara_seecs
Tue Sep 16 2014, 10:53 AM
akshar
Fri Sep 12 2014, 12:45 PM
iec.naga
Tue Sep 09 2014, 01:09 AM
ELTenin
Sun Sep 07 2014, 09:51 AM
dexter_a
Sat Sep 06 2014, 08:46 AM
pedrocardoso
Thu Sep 04 2014, 07:04 PM

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ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Sep 17 2014, 12:59 AM
I think its important to list out the features of ...
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Posted By ajay_bhargav
Wed Sep 17 2014, 12:45 AM
you need to put a wait condition in ISR till the s...
akshar Avatar
Posted By akshar
Mon Sep 15 2014, 04:41 AM
sir,i used microcontroller 89v51rd2 in circuit. No...
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Posted By bobparihar
Mon Sep 15 2014, 02:24 AM
i am programming interrupt 0 using 8051my task is....
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Posted By ExperimenterUK
Sat Sep 13 2014, 12:23 PM
There may not be an exact equivalent .You will hav...
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Posted By akshar
Sat Sep 13 2014, 03:18 AM
Sir, Good Morning,Thank you for making me a member...
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Posted By ajay_bhargav
Thu Sep 11 2014, 12:52 AM
which compiler are you using? I suggest XC8 with M...
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Thu Sep 11 2014, 12:49 AM
I always prefer Olimex Dev boards when it comes to...
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Thu Sep 11 2014, 12:44 AM
master will always lower down the Chip select... s...
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Posted By ajay_bhargav
Thu Sep 11 2014, 12:38 AM
Well HitechC is the compiler used inside XC8. So i...