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1  Using Arduino / Networking, Protocols, and Devices / Another type of antenna for Arduino cellular shield on: November 09, 2012, 09:02:21 pm
I have a cellular shield https://www.sparkfun.com/products/9607  and I wanted to get a good antenna for it, besides the generic one for it.  I read in a tutorial that you can use car ones.  Any suggestions?
The shield has an SMA plug.
2  Using Arduino / Sensors / Re: Rotation Sensor HELP!! on: November 07, 2012, 08:02:46 pm
I am using this to detect if a dc motor has slowed down when it's supposed to be rotating, or if it has stopped completely.  Yeah i read the specs for the potentiometers and they won't spin continuously, good point.  In this case the encoder will spin continuously and detect a slow down or stop? Any other sensors that can do this? or any other method?
3  Using Arduino / Sensors / Rotation Sensor HELP!! on: November 06, 2012, 10:29:40 pm
Hey,

I hope someone is familiar with rotation sensors, I was looking at this one http://www.robotshop.com/ProductInfo.aspx?pc=RB-Dfr-43
I wanted to know how the connections consisted of, I guess the metallic shaft needs to be moved by something else? And do you need any other components to set it up with breadboard?
And how would this one work? this is an encoder based one http://www.robotshop.com/phidgets-rotation-sensor.html
I want to use this with a dc motor.  Any ideas would be helpful, as I do not have any background in sensors whatsoever.

Thank you!
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