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16  Forum 2005-2010 (read only) / Interfacing / joystick smoking! on: September 03, 2008, 11:45:26 pm
I found a misc joystick pot today. It was marked with 20k and nothing else. no real information on it.

I hooked it up with:

5v to one side
analog input connected to middle
neg to other side

(only hooked up one axis of the joystick for test)

after a moment or so it started smoking.

i'm new to hardware hacking - i assume i was passing too much power to it? while connected it did give out values though they were a bit low (never hitting 1024 with analogread() as a normal pot would).

should i put some resistors inline?

other advice?

should it have worked and is just a bad joystick?

all advice appreciated.

17  Forum 2005-2010 (read only) / Interfacing / Re: external memory on: October 15, 2007, 01:43:44 am
I think that may be just what I need - thanks!

For some reason it seemed like in my initial research I had ruled out out eeprom's but from the tutorial it looks like it would work great.

Where does the eeprom get the power to store the data? The types of devices I'm trying to copy usually have a battery that back's up the memory. What type of memory do you think that would be?


18  Forum 2005-2010 (read only) / Interfacing / external memory on: October 15, 2007, 12:25:04 am

My application generates small arrays of integers.

I want to be able to store those for later use (after power down). I do not want to use
the memory on the arduino.

Can anyone recommend the easiest way to add a small memory chip (4k bytes? 16k bytes?)
so that I can, as needed, copy the current array to memory for later recall.

I have no idea if this is easy or hard so feel free to tell me if it is a hard problem.

Thanks in advance.
19  Forum 2005-2010 (read only) / Interfacing / Re: Audio record and playback on: November 11, 2007, 08:34:57 pm
I also get "something" from the output that is a bit like the input (although its very noisy):

Have you gotten any further with this?

I'm trying the same thing and, while I don't expect much quality, it seems way worse than it should be.

20  Forum 2005-2010 (read only) / Interfacing / Re: lcd tutorial not work on 4x20 :-( on: November 01, 2007, 01:25:42 pm
Not sure where but there is mod to the library to work with 4 lines. I'm still waiting for my 4 line to arrive.

This may be it:

21  Forum 2005-2010 (read only) / Interfacing / Re: using two serial devices on: October 17, 2007, 08:16:07 am
rockin! thanks!
22  Forum 2005-2010 (read only) / Interfacing / using two serial devices on: October 16, 2007, 11:51:16 pm
Is there anyway to use two serial devices in the same project?

I want to use the TX to send midi data and also hook up an LCD.

Is this possible?

23  Forum 2005-2010 (read only) / Interfacing / steady timing (midi sync, etc.) on: October 16, 2007, 12:15:52 pm
I am working on a midi sequencer.

Can anyone recommend what I can use to generate steady timing? It seems in the past I was told I needed a crystal (?) I have no experience with this.

Using only the arduino there are timing variances (to be expected of course).

Thanks for all input.
24  Forum 2005-2010 (read only) / Exhibition / Re: midi sequencer on: September 04, 2008, 02:21:50 pm
it generates midi sequences based on some pre-programmed rules to get techno-like patterns.

it sends notes to one channel (connected to a tb303 emulator - mam mb33 mkii)

and sends other notes to my tr909 triggering kick and hihat

after playing for a few beats it generates a new pattern.

my newer version keeps the same pattern and just evolves it more like "real" techno. after a certain amount of time it does a slight break-down/build-up before dropping the next (subtle) change.

a button allows you to create a new sequence if you do not like the current one.
25  Forum 2005-2010 (read only) / Exhibition / midi sequencer on: August 22, 2008, 09:08:02 am
Here is my sequencer I made last night:

26  Forum 2005-2010 (read only) / Frequently-Asked Questions / duplicating arduino completed projects on: August 23, 2008, 12:42:39 am

Once I have a "complete" project - all code working the way I want - can I then pull out the amega8 chip for use in the permanent circuit and then put a new amega8 into my arduino board for further learning?

In other words, can I

1. pull a programmed amega8 from my arduino board
2. wire up power and all needed i/o pins

and pretty much expect it to work?

Is there a better method? For each "complete" project I just want to make one or two copies.

Thanks for your advice.

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