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586  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Relay question from another noob! on: September 27, 2007, 05:21:45 am
The only thing with relays is they should have a diode across them to prevent 'miniature surges' when the relay turns off.

Tip: The red wire does not connect to the black wire. Especially not via a body part. smiley-wink

If your not afraid of 220v, then I'd definitely advise against it.
As someone who has been shocked a number of times with it, its not something to take lightly.

Although its interesting to note that mains is nothing compared to sticking your finger in a ordinary battery powered camera flash. Now *that* hurts.
A 350V capacitor discharging instantly in to your finger.
587  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Relay question from another noob! on: September 26, 2007, 11:09:31 pm
If your a n00b, I'd advise against playing with 240v/110v.
588  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: tic tac toe board using maxim7219 on: September 27, 2007, 05:17:36 am
Nice idea. Its certainly possible.

To make it think that its a 3x3 array, you'd just talk to it as if it was a 8x8 array with all the missing LEDs off.
589  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: My n00b thread  <assumed FAQ> on: September 25, 2007, 03:59:08 pm
A alternative to bluetooth is wire up a infrared receiver and led.
You'll have to write the protocol yourself however.
590  Forum 2005-2010 (read only) / Bar Sport / Re: To any bored Developer: Smart Fan Controller on: November 06, 2007, 06:09:30 pm
Quote
I think we could use PWMs connected to relays for the fans. So we would use 12v relays?
PWM connected to relays? Eww.
Relays cant switch fast enough I think anyway.

Transistors or Optocouplers I think would be the best way to go.
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