Did I build my motor controller properly?

jackjohnson64

I've been trying to build a motor controller, and here's a pic of my first attempt:
http://img.photobucket.com/albums/v229/yamoo/DSC00319.jpg

Here's the circuit it should be following:
http://img.photobucket.com/albums/v229/yamoo/motorcontroller.png

Alternate angles:
http://img.photobucket.com/albums/v229/yamoo/DSC00320.jpg
http://img.photobucket.com/albums/v229/yamoo/DSC00321.jpg
http://img.photobucket.com/albums/v229/yamoo/DSC00322.jpg

Nothing popped or melted yet. I've been running it for about 5 minutes, shutting it on & off several times.

I would upload the original schematics I'm following, but photobucket just errors whenever I try uploading the scan.


Does it look like the circuit is assembled properly?

RDL2004

It looks like it should be okay. The 470 Ω resistor should protect the Stamp from damage as long as the Vdd isn't too high. Hopefully the transistor can handle the current required by the motor. If it works as you expect it to and there is no smoke or sparks and nothing gets hot, it should be okay.


Check out Nuts and Volts of Basic Stamps column #6 http://www.parallax.com/dl/docs/cols/nv/vol1/col/nv6.pdf

Leon

You need a diode directly across the motor.

RDL2004

You need a diode directly across the motor.

True, I meant to say that but forgot. Like in the last diagram in that N&V column, but with the motor where the relay is.