Motor Shield only puts out 2-3 volts

[spoondrift]

Hello,
I've got some questions about my motor shield. I'm trying to control a DC motor. With a speed of 255, I only get a bit less than 3 volts, even with an external 9 volt or 12 volt. Am I doing something wrong?
Thanks,
-Ian

[spoondrift]

here are some pics

[adafruit_support_bill]

What are the specs of the motor you are using?
Is that 3v measured with or without the motor connected?

What kind of power supply are yo using? If you are using an external supply, remember to remove the power jumper.

[spoondrift]

Thanks for replying,
The motor is just a hobby DC Motor from an old RC Car. I'm just using it for tests, I don't know anything about it but I know that I have got it to run from 5 volts to 12 volts. It doesn't move at all on the motor shield.
I've tried using it without an external supply, and with a 9 volt battery. It doesn't work either way. The motor will run when hooked up directly to the 9 volt.

The 3v is measured without the motor on.
The shield is supposed to be a pre-built adafruit motor shield, all the specs should be the same as the adafruit kit.


Thanks for your help,
-Ian

[adafruit_support_rick]

You should contact the manufacturer or vendor of the shield for support.

[adafruit_support_bill]

The shield is supposed to be a pre-built adafruit motor shield

It is not an Adafruit motor shield. It looks like a copy of an older version of the board. The silkscreen says DK Electronics and there are some non-standard parts on it. As Driverblock says, you need to contact the manufacturer/vendor for support.

[spoondrift]

Thanks for letting me know it's not an adafruit. There was certainly some false advertising in my purchase, I'll try to get my money back. Thanks!

[khelms]

Hey, i purchased the same shield and am having the same problems. What did you find out? thanks

[khelms]

I was just messing with it, if you hook up an external power source to the EXT_PWR connection, and remove the jumper across the Power pins next to it, it will bring the voltage, and amperage up. leaving plenty of power for motors. I have libraries for the shield to if you want to do some testing. just let me know and i can email it to you if you have any questions.

[Fotomax]

I was just messing with it, if you hook up an external power source to the EXT_PWR connection, and remove the jumper across the Power pins next to it, it will bring the voltage, and amperage up. leaving plenty of power for motors. I have libraries for the shield to if you want to do some testing. just let me know and i can email it to you if you have any questions.

I also have one of these boards and are a newbie to this. Do you have any wiring examples or more nice to have information about this board?

[khelms]

what kind of information are you looking for? adafruit makes a motor shield. If you look under arduino shields and click it, there it a bunch of stuff there like examples and basics on usage. You will also need to download the library to use the shield. Are you using the UNO REV3?