Having problems with chip and DC motor and potentiometer and Arduino....

[Guest roineust]

Hello!

I have tried to build the following circuit:

http://fritzing.org/projects/drive-motor-using-l293d-sn754410

I have used and copied all the same components and wiring - exactly (i think..).

But - the motor seems to be working at the same speed and is not turning slower or faster, as i turn the potentiometer in each direction.

i have thought of several possibilities, for what is going wrong:

1. maybe the guy in the Fritzing site, refers to a stepper motor and not to a regular DC motor and that changes the whole picture, since i am using a regular small DC motor?

2. At the beginning of wiring and connecting the whole circuit together, i made a mistake and at the channels that are supposed to get 5V (red wires), i connected about 11V instead (the power that i need at max for the motor), maybe i have damaged the chip this way?


That's it...i can't think of anything else...

Can anyone with some serious experience, help me understanding, step by step, what is going wrong here?


Thanks a lot!

[audioguru]

I see no schematic, just a bunch of wires and parts on a breadboard.
There is no text and no instructions.

The pot will control the speed of the motor with PWM if the Arduino makes PWM pulses.

[audioguru]

On the other website forum you said you accidently applied 11V instead of 5V to this circuit which fried the Arduino. Then the circuit worked fine when the 5V was 5V and the burnt Arduino was replaced.