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1  Using Arduino / General Electronics / audio speaker resistor on: November 23, 2012, 08:56:31 am
hello there,

i have an arduino uno and would like to plug an audio speaker (5W -not 0.5W- 8 ohm).
would anyone have the kindness to tell me what resistor should i use for it? (and explain the calculation behind it so i won't bother again ;P)
as a note i've already checked the "arduino tutorial tone". but got scared trying since the wattage of the speaker wasn't revealed...(or does it make sense or matter?)

thanks a lot!

alex, lost in space
2  Using Arduino / Project Guidance / game installation on: October 24, 2012, 01:48:11 pm
Hello there!

My name is Alex from Switzerland. I am planning to start using Arduino on an artistic project due on this December... I have no experience in electronic but a bit in programming (python, processing).

Here are my goals:
- create a vertical wooden panel with a button on it. the board has many holes that integrates LEDs (ideally white and around 50 of them)
- create a sound device connected to the board
- write the program for 2 states: when nothing happens then light pattern 0 + sound 0, once the button is hit then light pattern 1 + sound 1, once the pattern 1 is done back to 0.

"That's it" i guess. So if anyone has the kindness to guide me i would really appreciate. I don't really know where to start but here are already some questions:
- what kind of Arduino board should i get for this?
- what are the other devices/components i need to make this work and where's the best place to buy them ?
(piezo, amp, button, LEDS, cables...)
- about the LEDs how to connect them to a breadboard if they are at a greater distance ( bare in mind that i don't know how to solder...)

Big thanks in advance! Reading back myself i feel November will vanish in a sec smiley-grin

i found this video...looks so cool!

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