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106  Forum 2005-2010 (read only) / Interfacing / Simple Motor Circuit on: March 29, 2009, 09:33:01 pm
I'm looking for a simple way to power a solarbotics GM3 gear motor -

I'm trying to power it with the Arduino's Vin and ground through a 100 Ohm resistor. When turned on (its controlled by a transistor), the motor does not spin unless I give it a start.

Using USB to the Arduino, Vin should be 5 V. At 5V, the GM3 should draw 67 mA.

Should the Arduino be able to provide enough power? Should a smaller resistor or different pin be used?

Does anyone know a simple way to do this?
107  Forum 2005-2010 (read only) / Workshops / Re: Arduino Hacklab NYC on: June 11, 2010, 10:03:34 pm
LadyAda is not brick and mortar, but she is in NYC. So you should get your stuff fast.
108  Forum 2005-2010 (read only) / Exhibition / Re: home automation with arduino and android on: December 22, 2010, 12:47:48 pm
This post started out with the premise that other home automation systems are too expensive. Aren't X10 systems pretty cheap ($99 for controller and software)?

One issue with X10 is that they require a computer with X10 controller on 24/7. The computer provides a web interface and can turn devices on/off at scheduled times. For example, you may want to switch an outside light on automatically at 7 PM every day.

Have you given any thought to a server solution, i.e. leaving an android device at home and on 24/7 that can be connected to remotely?
109  Forum 2005-2010 (read only) / Exhibition / Re: Automatic Toilet Flusher on: October 18, 2010, 08:53:39 am
I know my wife will like it. She is quite tired of the children forgetting to flush. They are very lazy.

But seriously, has anyone ever had trouble with an overflowing toilet? The float shut-off value in the tank failed and the water overflowed from the top of the tank. It was clean water, but the flood caused over $10k in damage. I was thinking about building some kind of moisture alarm.
110  Forum 2005-2010 (read only) / Exhibition / Re: Arduino Powered Robot on: July 01, 2010, 09:24:03 pm
This is very nice. I'm building something similar with Tamiya tracks, Tamiya motors and a cardboard frame. It's a lot flimsier than yours, but also a lot cheaper.
111  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Connectors on: September 23, 2010, 09:36:44 am
I worry about the opposite, that my project will halt my marriage.

But too bad about the divorce.  smiley-sad
112  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Connectors on: September 23, 2010, 09:34:12 am
Molex's "How to recognize a good crimp":

This is the kind of detail my obsessive mind needs!
113  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Connectors on: September 22, 2010, 11:36:53 am
Yes but sometimes the short end can be a little too short for a good connection. But then you can solder two headers back to back and have long pins on both sides.

That was the trouble I had with the Ping!, the short end was too short. No one sells longer connectors?

You have to get the crimp-on parts as well, little metal things that crimp onto your wire and push into the receptical. Normally the "official" crimping tools cost a fortune (and I mean a fortune, $400-700) but you can use narrow-nosed pliers.

Is it fairly easy to do with needle nose pliers (just insert the wire, squeeze and insert it in the receptacle)?
114  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Connectors on: September 21, 2010, 10:45:15 pm
Are Molex connectors a good way to connect 3 wires to a bread board? I think the Ping! ultrasound sensor has a molex connector, but I wasn't sure how to connect it to a bread board. Anyone know?
Can a connector like this be used with a bread board:

Does the short end go in the bread board and the long end go to a molex receptacle like:

How is bare wire connected to the molex receptacle? Is a tool required?
115  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Wheel and Frame Ideas on: April 23, 2009, 03:40:44 pm
The design is completely original but the inspiration is completely derivative. It is similar to many first bot projects.
116  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Wheel and Frame Ideas on: April 23, 2009, 03:31:35 pm
The wheel and frame are from a $250 Lego Mindstorm NXT. I wanted to give away a few as kits, so I didn't want to break up my NXT and I wanted it to be cheap.
117  Forum 2005-2010 (read only) / Frequently-Asked Questions / Wheel and Frame Ideas on: April 10, 2009, 02:22:56 pm
I built a 3 wheel arduino based bot:

The third wheel and frame were made from lego.

Any ideas for cheap, non-lego alternatives?
118  Forum 2005-2010 (read only) / Bar Sport / Re: Have you built a Stiquito? on: November 11, 2010, 12:25:32 pm
I have not used these, but Muscle Wires sounds like they have a lot of potential though their amazon review suggests otherwise. Stiquito has great reviews.

If you are primarily interested in making a crawler, there is a chapter in "JunkBots, Bugbots, and Bots on Wheels" and there is a video on Parallax's site demonstrating the crawling action with their bots.
119  Forum 2005-2010 (read only) / Bar Sport / Re: Post Your Arduino Unboxing Pics / Vids Here on: November 04, 2010, 09:45:10 pm
For prototyping, its a lot cheaper to just build the Arduino yourself on a bread board. Not sure I understanding this unboxing thing...
120  Forum 2005-2010 (read only) / Bar Sport / Re: Ideas for a final year project. on: October 18, 2010, 08:09:37 am
It should not be an issue to use a library. Building on other people's work is what people do. It is not trivial to use a library. You must understand how it works.
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