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
Thu Nov 20 2014, 06:00 PM
@Mehboob.. I don't think you can do that.
Sat Nov 15 2014, 06:41 AM
Mehboob
Pls can you send me code in c of PWM generation using UART/serial port in 8051.
Fri Nov 14 2014, 02:51 PM
mohammad aqil
NEED A BOOK ON MICROPROCESSOR AND INTERFACING BY D.V.HALL. RIGHT NOW, I SHALL BE VERY THANK FULL TO U....
Thu Nov 13 2014, 02:15 PM
m
please code hex project avr blood pressure monitor
Thu Nov 13 2014, 05:56 AM
Lambo
hi mate, whats the ajay-bhargav? tell us more pls
ExperimenterUK
Wed Nov 12 2014, 12:56 AM
@tmtm000.. have you been able to join ?
ExperimenterUK
Wed Nov 12 2014, 12:54 AM
@Alice..become a member,then send a PM to ajay_bhargav the site owner.
Tue Nov 11 2014, 03:58 AM
Abhishek Bansal
Thanks a lot for your informative tutorials!
Mon Nov 10 2014, 09:03 AM
Alice
Hello, This is Alice from a PCB rototype manufacturer. Our company is interested in your website contents, and wonder if we can advertise our company with payment on your website. There are two ways to advertise: first, if we an get a instant quote section on your main site columns; second, whether we can get a advertising section if you have any avaliable one. If any of above ways avaliable, please contact me with your detailed scheme and advertising charge. Thanks. Alice
Sat Nov 08 2014, 11:58 AM
Mohamed_123sd
Signals and Systems, 2nd Edition by Alan V. Oppenheim Alan S.willsky with S.Hamid Nawab?

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sankalp_s
Tue Nov 25 2014, 05:13 PM
dodul
Mon Nov 24 2014, 10:08 PM
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nomi77 Avatar
Posted By nomi77
Wed Nov 26 2014, 07:30 AM
@ajayAnother option is this if i can do void stor...
nomi77 Avatar
Posted By nomi77
Wed Nov 26 2014, 07:05 AM
@ajayI did same procedureconnected my modem with L...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Nov 26 2014, 04:47 AM
Are you manually trying to input data via virtual ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Nov 26 2014, 04:39 AM
Uart is totally different peripheral. Look at seri...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Nov 26 2014, 04:37 AM
I see three different components in your design bu...
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Posted By ajay_bhargav
Wed Nov 26 2014, 04:33 AM
Are you bound to use assembly? if yes then there w...
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Posted By ExperimenterUK
Wed Nov 26 2014, 02:33 AM
I assume you mean CMMS as in AT+CMMS, something to...
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Posted By Max.otto
Tue Nov 25 2014, 09:54 AM
Hello all,i was bit confused of my requirment. But...
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Posted By dodul
Mon Nov 24 2014, 10:11 PM
I know its a bit off topic. But, any help would be...
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Posted By nomi77
Mon Nov 24 2014, 02:44 PM
here is the attached code + simulation please help...