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1  Using Arduino / General Electronics / Re: [Beginner] How can I use the Arduino as a switch? on: Today at 03:39:44 am
I'm using the same resistance as I was for the LED, 220ohms. Is that sufficient?

5 volts / 220 ohms * 1000 milliamps per amp = 22.7 milliamps.  Which is less than 40 mA (damage occurs) so that is a reasonable choice.

Quote
Should the Mosfet have a resistor between the Arduino and white wire also?

I rarely include one but, yes, it should.  The goal is the same for a MOSFET (limit the current).  Someone else will have to help you determine a reasonable resistance for the MOSFET you are using.
2  Using Arduino / General Electronics / Re: [Beginner] How can I use the Arduino as a switch? on: Today at 02:49:52 am

No current limiting resistor between the Arduino and the transistor base?
3  Topics / Robotics / Re: surveillance robot car on: Today at 01:31:44 am

@maotzy, please do not cross-post.  Threads merged.
4  Community / Bar Sport / Re: What Faggot means in the UK on: August 22, 2014, 05:45:47 pm

Wow.  You Lancashire folks are hardcore...
http://boingboing.net/2014/08/22/watch-women-steal-new-lawn.html
5  Using Arduino / Project Guidance / Re: uno + sim900 + PIR on: August 22, 2014, 05:11:52 pm

Please do not cross-post.  Other post removed.
6  Using Arduino / Installation & Troubleshooting / MOVED: Problem with SD library on: August 22, 2014, 05:08:11 pm
This topic has been moved to Storage.

http://forum.arduino.cc/index.php?topic=261611.0
7  Using Arduino / Project Guidance / MOVED: Arduino Yún and dynamixel AX-12 servos on: August 22, 2014, 05:02:00 pm
This topic has been moved to Arduino Yún.

http://forum.arduino.cc/index.php?topic=261812.0
8  Using Arduino / Programming Questions / MOVED: Ayuda con PHP on: August 22, 2014, 05:00:59 pm
This topic has been moved to Software.

http://forum.arduino.cc/index.php?topic=261821.0
9  Using Arduino / Programming Questions / MOVED: Arduino e la Radio on: August 22, 2014, 04:58:27 pm
This topic has been moved to Hardware.

http://forum.arduino.cc/index.php?topic=261909.0
10  Using Arduino / Programming Questions / Re: Read messages on the arduino WITHOUT THE GSM shield on: August 22, 2014, 04:53:03 pm

@1abel, please do not cross-post.  Other thread removed.
11  Topics / Robotics / MOVED: brazo robot on: August 22, 2014, 04:50:55 pm
This topic has been moved to Software.

http://forum.arduino.cc/index.php?topic=262143.0
12  Using Arduino / Installation & Troubleshooting / MOVED: Arduino Yun TinkerKit lcd on: August 22, 2014, 04:39:36 pm
This topic has been moved to Arduino Yún.

http://forum.arduino.cc/index.php?topic=262528.0
13  Products / Arduino Yún / Re: Arduino Yun TinkerKit lcd on: August 22, 2014, 04:39:13 pm

Please do not cross-post.  Other thread removed.
14  Using Arduino / Programming Questions / Re: How can I create a countdown using millis() ? on: August 22, 2014, 12:39:56 pm
Code:
if (sec < 0) KaBoom();}

if (sec <= 0) KaBoom();
15  Using Arduino / Microcontrollers / Re: FIXED: issue with ArduinoISP when writing to target-EEPROM on: August 22, 2014, 12:31:07 pm

I suspect the problem would have been easier to diagnose if you had not included the otherwise useless -F.
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