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View Full Version : (DC motor )Digitial Out to control FWD and REV_How ?



Stamp_III
12-14-2004, 05:35 PM
Hi !

I need help on this. I want a 9V DC motor to rotate FWD and REV using a digital out put,( i.e i have only two out put either 1 or 0. ) If I am not giving any input to motor I want it to be still. The problem is the output is always high or low so I can assign 1 for FWD and 0 for REV.

Really appreciate if any one can help on this.

Thanks,
JAS

vikas
12-14-2004, 06:20 PM
Ever heard what H Bridge is :) ??? This is what you need .

Stamp_III
12-14-2004, 07:24 PM
Hi Vikas,

Thanks a lot. But any one know where to get it in Bangalore ? or It would be great if some one can fwd me an H-Bridge ckt ( wich can be assembled with parts we get in India )

Thanks agin,

vikas
12-14-2004, 08:20 PM
Why not my a L293d hbridge IC ( Rs 125 ) availible in most places or if you want to build check out a simple circuit in wiki section

http://www.roboticsindia.com/modules.php?name=Wiki&page=MotorDrivers

mallumobile
12-27-2004, 10:15 AM
Hi Vikas,

Thanx for the ckt. I tried it. The good news is that " it works " but the bad news is that " the SL100 and SK100s are really getting HOT ".

Any idea why is this so ? I am using a 9.6V batt. to run the motor. To make the logic high i am giving 9.6V to the base of BC148, is that a problem ? or some thing to do with the motor ?

Cheers !,
M_Mobile

vikas
12-27-2004, 08:39 PM
It will get hot ... after all the transistors are driving motors :) ... My advice sticks in some heatsink ( heat paste will also be nice ) . You can also try to use better motors :) .

addy
07-03-2005, 12:37 PM
Hi Vikas,

Thanx for the ckt. I tried it. The good news is that " it works " but the bad news is that " the SL100 and SK100s are really getting HOT ".

Any idea why is this so ? I am using a 9.6V batt. to run the motor. To make the logic high i am giving 9.6V to the base of BC148, is that a problem ? or some thing to do with the motor ?

Cheers !,
M_Mobile

it has to get hot..... afterall sl100 cant really do without some serious heat sink..... redesign ur h bridge
try out mosfets.... they do bear very high currents and r quite faithful too..

addy
12-17-2005, 04:55 PM
by the way u can try driver ics like l293d or uln2803...
these ll do the job if the current ratings of ur motors r not tat high.

juliab
12-31-2009, 10:29 AM
A speed and position controller for a DC motor, having SCR power circuits, has a digital computing device directly connected to the SCR firing circuits for controlling the SCR firing angle. A command signal in the form of a number is testking N10-003 (http://www.testking-exams.com/N10-003.htm) applied to the computing device from a tape reader or other command signal generator. An encoder, operatively connected to the shaft of the motor, furnishes a feedback pulse frequency indicative of motor speed to a counter. The testking 1Y0-A09 (http://www.testking-exams.com/1Y0-A09.htm) computing device periodically samples the number in the counter for speed and position computations. The computed firing angles are compared with maximum firing angles testking HP0-D04 (http://www.testking-exams.com/HP0-D04.htm) loaded into the computing device to prevent excessive currents which could cause arcing or demagnetization.

docel
01-01-2010, 07:16 AM
Well...well !!
Looks like RIs first SPAMBOT attack!!
This is an excerpt from Patent 4153863, collaged with a commercial product ad.....

tpsbpl
10-31-2010, 04:36 PM
why not my a l293d hbridge ic ( rs 125 ) availible in most places or if you want to build check out a simple circuit in wiki section

http://www.roboticsindia.com/modules.php?name=wiki&page=motordrivers

the link is redirecting to main forum page please check