Arduino L293d Unipolar Heeeeelp!!!

Hi everybody!!

I m new to this forum and I don’t know anything about electonic.
As a bonus I m italian… so forgive my english…

I ve an Arduino, one L293d and a 12v 0.35a unipolar with 5 wires:
I read some projects here and there so I thought: It s so easy!
And now I spent the last 4 days getting nothing… :frowning:
It s so frustrating…

I tried all the tutorials… but no one worked. Simply the stepper do nothing.
With some manual switches I got to make it move… but If I try to use the L293D… nothin again. It seems operating… I also tried another one… I feel like I missing something important…

I also got moderate results with proteus simulator, but if I try to use a 5v+ power source instead of Logicstate component… I get some strange voltages… is it normal?

Please, I know is not easy to help… (I hope the pic can explain abit better then I could)… I really feel like an idiot… it seemed so easy…

Thanku very much, and sorry for the long post.

Have a nice day.[/img][/img][/img][/img]

You appear to lack pull-ups or pull-downs on the pushbuttons - is that intended?

Also its hard to follow that photo - have a schematic? In particular how is the motor wired?

Thank u very much… to be honest I don’t even know what pull up/down resistance are… :sweat_smile:

BTW I sorted out things a bit…

in the end I came up with something like that in the picture…

Sorry to bother u…BUT One thing is very obscure to me:

I know that a battery to work properly needs to be in a closed circuit, but in mine are not, they both go to the ground…

Considering I don’t have the GROUND in practice (I use the power supply ground usually)… where should I hook them?

Or better, I know you can’t teach me electronics via posts… at least… could u suggest me where to find this kind of info? In the book I read… I didn’t find something similar : 2 batteries, IC, different voltages…

Thank u very much. Have a nice day.

bats.jpg

Both your batteries are driving closed circuits - one of these circuits happens to control current in the other, and both share a ground, but they are both circuits around which current flows.