Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: mohamed on February 16, 2008, 03:28:28 PM

Title: motors of the 40$ robot!!
Post by: mohamed on February 16, 2008, 03:28:28 PM

now after i complete the cerciut wireing and i connect the motors it doesnt move as it like the motor doesnt get any power only the green,red and blue LEDs are working but the motors doesnt
i connect the motor to pin 3 and 6 and the other one to 14 and 11 can anyone tell me what is wrong plz coz i spent alot of money and work on that project and it's so dissapointed to not to work

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 16, 2008, 09:22:18 PM

I think you have not connected the output of the sensors to the L293D.
Post pics of your circuit if possible so that I will be able to help you better.

Title: Re: motors of the 40$ robot!!
Post by: hate_forever143 on February 16, 2008, 10:33:57 PM

hi dude...
same problem here...
motors are not working even though the leds are glowing...
my competitions is on the 20th
if you find a solution just notify me 2....

Title: Re: motors of the 40$ robot!!
Post by: airman00 on February 16, 2008, 11:00:14 PM

Do you have a multimeter or a volt meter at hand?

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 03:15:34 AM

yea i have multimeter
i'll try to post any pic today

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 04:30:47 AM

here is pic for my connections

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 17, 2008, 05:52:01 AM

Couldn't find any mistake in your circuit. But i'm not sure of the connections of the L293d.
Can you post the close-up pic of the L293d connections?

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 06:36:46 AM

here is a close pic to the L293D connection

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 17, 2008, 08:45:26 AM

Have you connected the motor wires to the L293d?(They are not seen the picture)

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 08:55:44 AM

i connect the motor to pin 3 and 6 (-ve pole to pin3 and +ve pole to pin 6 ) but it doesnt work

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 17, 2008, 09:48:46 AM

What about the other DC motor?
You have to connect one dc motor to pin 3 and 6 and the other to pin 14 and 11.

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 10:26:08 AM

i solder both of them and nothing happened plz tell me what to do?

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 11:40:51 AM

could anyone tell me what is wrong wiz this connection
here is a question do i have to solder pin 3 with pin connected to the male header same goes with the other pins or not?
PS: lots of ppl facing the same problem so plz dont ignore

Title: Re: motors of the 40$ robot!!
Post by: paulstreats on February 17, 2008, 06:07:17 PM

could you post a photo of the top of the board aswell please so we can see how the polarity of the components are thanks :)

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 17, 2008, 11:35:16 PM

here is the top

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 18, 2008, 05:43:48 AM

From the picture which shows the top of the board, I see that you have not connected the sensor outputs to the L293d through the header pins. The procedure to do that is given at http://www.societyofrobots.com/member_tutorials/node/66 (http://www.societyofrobots.com/member_tutorials/node/66)

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 18, 2008, 10:01:11 AM

i did solder them coz i didnt find these sockets that attached to wires
but there is sth happened when i remove the two wires near the capacitor (to make the robot move white line follower) i was testing with one motor and when it moved i attached the other motor but when i switched on the ciruit again ,both motors weren't moving so what wronge happened?!!! ???
PS: do the motors need more voltage like battery of 12V or what?

Title: Re: motors of the 40$ robot!!
Post by: Pratheek on February 19, 2008, 06:11:09 AM

What are the ratings of the motor you are using?
And also what is the specification of the battery you are using?

Title: Re: motors of the 40$ robot!!
Post by: mohamed on February 19, 2008, 10:46:06 AM

i'm using a 12v motor but it didnt say how much in the amps but it's number is (MMI-6S2L)
and i'm using a 9v eveready

Title: Re: motors of the 40$ robot!!
Post by: Admin on February 22, 2008, 06:03:49 AM

Quote

i'm using a 9v eveready

Thats partly why its not working. You need a much better battery, like a NiMH or NiCad. A 9V probably can't power your motors.