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16  Forum 2005-2010 (read only) / Troubleshooting / Re: USB Connector from Farnell? on: January 09, 2007, 07:59:10 am
There is no picture, but when you click the "Alternative Products" link on the bottom of the page it directs you to this USB connector:



which looks like the one on the Arduino NG.
17  Forum 2005-2010 (read only) / Troubleshooting / Re: overcurrent charge - did I brick my arduino? on: December 27, 2006, 06:21:11 am
Try booting from a Linux live CD, like Knoppix or D*** Small Linux or similar, and see if the USB port still works or not.

No definite answer here, but I assume a USB hub will protect your laptop since it has its own built in power supply, and the USB signals will go through some microcontroller before being forwarded to your computer. So I assume IF some shorting occurs with your arduino the silicon in your hub should be fried first and protect your laptop's USB ports. Hopefully.
18  Forum 2005-2010 (read only) / Troubleshooting / Re: defect boards! sending back? on: December 14, 2006, 05:47:20 am
Try different computers with different operating systems.
19  Forum 2005-2010 (read only) / Troubleshooting / Re: Yet another "Progamming Error"w/new sparkfun b on: November 20, 2006, 06:47:52 pm
You don't need to connect an external LED to the Arduino board, here already is one on pin13. Remove that external LED and it will work. On one of your pics that LED is already on!
Then change the code to use another pin and try it again, but this time don't forget to use a resistor!
20  Forum 2005-2010 (read only) / Troubleshooting / Re: another "Programmer is not responding" error on: November 20, 2006, 04:27:09 am
Since it worked at least once it's probably a timing issue.

I had similar (although not nearly as severe) problems occasionally when using a slow, old computer (400MHz with WinXP).

This is how it works for me almost every time:
1) verify/compile
2) click upload button
3) reset arduino board after a second or two

On this old, overloaded computer the IDE obviously needs a little time to do its work, and if you reset the arduino board first it won't work. The above procedure works almost every time for me.
21  Forum 2005-2010 (read only) / Troubleshooting / Re: Battery powered arduino - problems with Analog on: November 13, 2006, 11:53:42 am
You don't need that voltage regulator. There already is one on the Arduino board.
22  Forum 2005-2010 (read only) / Development / Re: DIY Bluetooth audio Transmitter/Receiver ??? on: February 28, 2007, 07:56:35 am
Does it have to be Bluetooth? There are many cheap audio and video transmitters available.
23  Forum 2005-2010 (read only) / Development / Re: Arduino Boot-Cloner on: February 23, 2007, 04:49:25 am
OMG! An arduino virus!  smiley-grin
24  Forum 2005-2010 (read only) / Development / Re: ATMega168 on Serial Arudino Board on: February 15, 2007, 06:11:59 am
> What modifications (if any) would need to be made to run the ATMega168 on the serial board

None. The ATMega doesn't care whether it is connected to a serial port or the FTDI chip/USB port.
25  Forum 2005-2010 (read only) / Development / Re: Found this on Digg.com on: October 24, 2006, 03:27:09 am
I've seen this servo controller before. It's available individually for pretty cheap:

http://www.lynxmotion.com/Product.aspx?productID=395&CategoryID=52

Regarding your question: dunno how to do this with the arduino. But the firmware for this thing is open source, so you can have a look at how they did it.  smiley


http://www.lynxmotion.com/images/html/proj078.htm

Description of SSC-32 Operation:
http://www.lynxmotion.com/images/html/proj078a.htm
26  Forum 2005-2010 (read only) / Interfacing / Re: Mouse - sensor on: October 25, 2006, 04:47:22 pm
Optical mice often use a CCD sensor with 18x18 up to 30x30 pixel resolution. Some funny people have converted their mice into crappy scanners, or use these sensors for line following bots.



http://www.spritesmods.com/?art=mouseeye
http://www.mstarmetro.net/~rlowens/OpticalMouse/
27  Forum 2005-2010 (read only) / Interfacing / Re: Can I use the ATMega8 on it's own? on: November 01, 2006, 06:39:01 pm
I think so too. The (+) and (-) rails are usually broken in the middle in these kind of breadboards. The right half of your breadboard isn't connected to (+).
28  Forum 2005-2010 (read only) / Interfacing / Re: LM34/35 temp sensor on: October 26, 2006, 02:45:45 am
Thanks.
29  Forum 2005-2010 (read only) / Interfacing / LM34/35 temp sensor on: October 22, 2006, 02:45:37 pm
I am interested in measuring temperatures using the LM34 or 35. The LM34 measures in Farenheit, while the LM35 does degrees Centigrade. Here is the datasheet:

http://www.national.com/pf/LM/LM35.html
http://www.national.com/ds.cgi/LM/LM35.pdf

The temp sensor will output a voltage of 200mV at 20°C, 500mV at 50°C, 1000mV at 100°C etc. You get the picture.

How exactly do I have to connect the sensor to the Arduino's analog input? What kind of resolution can I expect? 5V/10bit = 5V/1024 = 5mV, or 0.5°C? Is there a way to improve this without using an op amp?
30  Forum 2005-2010 (read only) / Interfacing / Re: Wire.h and pin 13 on: November 22, 2006, 10:04:29 am
> I think that you have to do this just on your "master" board

It doesn't matter where exactly you place the resistors between +5V and the I2C "backbone", it just needs to be done somewhere on the I2C bus.
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