PDA

View Full Version : L293D



ashu
11-22-2005, 03:01 PM
is it true that the 8th Pin Controls the Speed of the motor and the current through the motors .
Am i doing the following right ?
i m supplying the seperate voltages to the Logic and L293D but 16 pin i m giving 5 volts(regulated) and 8 pin i m giving 6 volts .Effectively i m supplying Voltage to the Logic Circuit and 16 pin from the output of the regulator(7805) and 8th pin i m giving seperate voltage of 6 Volts .

yogi
11-22-2005, 07:44 PM
ya u have done right

Is any problems occuring

8th pin-voltage for motor

16th pin-logic supply for ic(5V)

I have connected 8,16pin short and applied 5V using adapter of 12V,500mA but the performance was not good with two motors.

Better use an SMPS for this purpose to avoid any power probs.


Bibin John
www.bibinjohn.tk[/img][/list]

yogi
11-22-2005, 07:46 PM
remember that input voltage of 7805 should be
Vin-(7.5-20V) as i remember

Check for the ratings of adapter, most adapters have 12V,500mA ratings.

addy
11-23-2005, 09:57 AM
hi ashu,
well if the ground is common it should work....
i mean i ve usedthem in all my robo's and i ve regulated a 6v supply with
a 7805 and gave tat{4.8v} to pin 1,9,and 16.
pin 8 to 6v or 12v wat ever u want.
pin 4,5,12,13 to ground.
then connect 3 and 6 to motors and give the control logic to pin 2 and 7.
u can also connect 14 and 11 to motors and give the control logic to pin 15 and 10.
i got this configuration working....
try out and lemme know if u have any probs.

devpriya
11-24-2005, 05:20 PM
is it true that the 8th Pin Controls the Speed of the motor and the current through the motors .

Yes 8th pin controls the speed of the motor because it is directly proportional to the input Voltage you are supplying to it............but current I dont think so..........current has nothing to do with that pin, it depends on how much you have loaded your motor.


The connections which you have done are all correct, if you are getting any problems then make sure that you have done common ground with the device which is providing it the logic.....like uC or comp. or anything else.