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1  Using Arduino / Networking, Protocols, and Devices / Re: I2C: Noise in the power source on: April 21, 2011, 06:21:47 pm
It's more than likely the space heater's injecting a high frequency spike into the supply rails when it switches on and off.

With this in mind, and remembering the basics of capacitors, you'll need a lower value of C to suppress the higher frequency. Now you could use an algorithm to find the correct (closest) value of capacitor to use if you knew the frequency to suppress, an easy and quick way (assuming you have the parts to hand lol) would be to try a 10nF (0.01uF) in parallel to the 100nF and 47uF that's already on the board then, if necessary, go down to a 1nF (0.001uF).

If that fails then I'd be looking at getting the caps as close as possible to the supply pins on the ICs as the board traces could be the culprit in your situation.

All the best.
2  Forum 2005-2010 (read only) / Interfacing / Re: Nokia 6100 LCD Display - Arduino Playground on: March 21, 2009, 04:15:46 pm
I've only had a quick read and it's hard to grasp from your words what you've done already so I may be wrong here; as you're now using two separate power supplies (the external 3V3 and the Arduino's 5V) in the same circuit have you connected both of their GND (0V) rails together?
3  Forum 2005-2010 (read only) / Workshops / Re: Arduinnovate! Liverpool on: March 16, 2010, 06:42:41 pm
"I am crap though so I would probably just end up watching"

And as I'm based on the Southport side of Wigan, so would I  ;D
4  Forum 2005-2010 (read only) / Exhibition / Re: Arduino Pro Mini Glowstaff on: January 16, 2009, 06:01:30 pm
What an excellent project.

Just think where this idea could be taken - a group of people all in formation and all spinning those things in time, and if there was some sort of RF link built-in they could all flash the same effects at the same time... what a light show that would be in a darkened hall.

Superb stuff, and I look forward to reading your latest developments on this neat project. Well done.
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