Strange power problem

[karandex]

I am making a line follower with arduino

so here is my setup

moter driver have 8 pins for
5 motors
2 pwm
vcc
gnd

driver http://robokits.co.in/shop/index.php?main_page=product_info&cPath=1&products_id=176
now some strange stuff

when i attach grd then every thing is okey but when i attach vcc it takes power which is provided for motor to arduino. i dont know arduino runs or lit up led only

second thing is when i  pwm pins it light up sensors and ALL led ( exept pin 13) pwr tx and rx and sensors which are taking power from 5v and gnd on arduino

when i attach pwm nothing works

please help

[karandex]

please anybody help me

[GrooveFlotilla]

when i attach grd then every thing is okey but when i attach vcc it takes power which is provided for motor to arduino

What is "grd"?
Could you maybe rephrase your question, post a sketch, show a schematic?

[daveg360]

As above although it does sound like you're trying to run 5 motors from the arduino?

[karandex]

now its okey. when i power motor driver it lit up arduino led but not arduino

But main problem is i can power teds for sensor they are dim when powered with 9 v no problem in usb

Its problem when there are more than 2 sensors

is there problem arduino for providing power

is it possible to provide power to arduino throgh it 5v pin because when i connect vcc pin to arduino then arduino start up. And circuit can i run without connecting both ground


Main thing is please suggest that do i need to provide seprate power to sensors

[GrooveFlotilla]

No sorry, it isn't making any sense.
You don't say what the sensors are, though unless they're taking an awful lot of current, it seems unlikely they're causing problems.

A schematic would be a great help.

Have you got grounds connected?
Have you double and triple checked your wiring?
Could this be a decoupling problem?