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3121  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: File unzipping issue on: January 07, 2010, 11:14:24 pm
ya, its just 2 different names, but! sometimes ms and "other" systems dont always agree

but a unziper program like winzip or winrar is free for a while and are, ... more adherent to the quirks of the real file format which may or may not be supported in Microsoft products

It is not that the are not able to produce a product that is 110% on the spot, but they do have a bit of a "problem" with the operating constraints applied on them

Try winzip or winrar, they are tiny and harmless long time compression software
3122  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Increase number of Inputs on: January 04, 2010, 11:20:43 am
http://www.alldatasheet.com/datasheet-pdf/pdf/50865/FAIRCHILD/CD4051.html

If someone doesnt beat me to it, Ill be glad to tell you more in depth about how to use it when i get home from work

[edit]did not know there was a playground page for it, so there ya go![/edit]
3123  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Increase number of Inputs on: January 03, 2010, 09:43:32 pm
analog multiplexer
3124  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Can this be done (twitter game) on: December 01, 2009, 10:59:14 am
or you can do some simple beeps with a speaker  smiley-wink, depends on how grand of a project this is going to be
3125  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: shopping list on: December 31, 2009, 12:15:23 am
good tip I snagged a set of those
3126  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: shopping list on: December 29, 2009, 11:42:43 am
transistors and diodes

transistors will allow you to switch higher voltages and currents, diodes will protect against back emf (for motors or relays ect)
3127  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Musical greeting card switch on: December 29, 2009, 08:28:22 pm
"real" switches are not much more

but yea FL is right, you could probably do similar with some tinfoil and cardstock
3128  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to get the Arduino to close a circuit on: December 29, 2009, 09:56:37 am
1k is fine (5 / 1000 = 0.005a)
3129  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to get the Arduino to close a circuit on: December 28, 2009, 11:34:53 pm
if there is electricity in the circuit then voltages and amperage are flowing, your selection of device depends on what that is

if your just trying to hack a keyboard, use a transistor
3130  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to get the Arduino to close a circuit on: December 28, 2009, 10:47:16 pm
relays use more current than the arduino can directly handle

the arduino switches the transistor, which can handle a different, maybe higher voltage and current, the transistor then switches the relay
3131  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to get the Arduino to close a circuit on: December 28, 2009, 07:29:04 pm
ok, lets go back to the top

what is the voltage and amperage of the load your going to be switching on and off?

you need to know that so you can choose the correct part, if its low voltage and amperage (~ <500ma) your 2222 nPn transistor should do fine

 If it is mains (120-240vac) and switching a 4 amp motor then were in a whole new world, but the basic's of operation are the same

arduino (or even the sensor in this case) toggles a ping "high", that voltage (after passing tru current limiting / safety stuff) connects to a switching device, which could be

    Transistor
    FET (big transistor)
    Relay
    or SSR (solid state relay, which is not really a relay)

which opens and closes the switch for the other circuit

3132  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Choosing resistors on: December 30, 2009, 06:57:53 pm
330
1k
4k7
10k

top few off the top of my head, course if your going to be messing around with that 555 timer its better to have a larger selection and / or some variable ones
3133  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: not sure how to go about this... on: December 08, 2009, 05:29:05 pm
if your going that route just use a micro switch on the end of the arm, when its above a level it turns off the switch

not very precise but A)cheap B)easy
3134  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Force sensitive resistors on: December 31, 2009, 01:34:40 am
cheap way out
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370304820805&rvr_id=&crlp=1_263602_263622&UA=W2F%3F&GUID=0fc8effb1250a0437a605a50fffe4be6&itemid=370304820805&ff4=263602_263622
3135  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Deploying the arduino on: December 30, 2009, 11:25:21 am
batteries will push quite a bit of current, for a little bit anyway ... a 9v can hold about 500ma for roughly an hour

the 7805 will actually handle more than 12 volts, but it has to dissipate the extra power by heating up

I run mine all the time on a 12v 1 amp brick, but I also have a heat sink on my regulator and it still gets warm quickly (2-300 ma) but not hot hot hot (and it's a crappy heat sink anyway, just the best i could fit on the bare bones board)

Also that RBBB does not have a 7805, it comes with something else which is much smaller in the ratings department, you can replace it with a 7805, slap a heat sink on it and get away with a 12v power source (exact amperage would depend on cooling)

And of course, what you choose to power it with depends on what your trying to power along with the arduino
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