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2236  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Common Anode vs Common Cathode (newbie questio on: March 18, 2008, 11:28:18 am
This is the closest i can find :

http://www.arduino.cc/playground/Main/DirectDriveLEDMatrix
2237  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Common Anode vs Common Cathode (newbie questio on: March 17, 2008, 05:24:17 am
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1204166215/4#4

The built in search in the forum is not very good. I often use Google to search the Arduino.cc site,  it mostly works a lot better.
2238  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Common Anode vs Common Cathode (newbie questio on: March 13, 2008, 02:13:20 am
Yes exactly. The positive pin is common for the 7 LED segments, and they have each their own cathode.

You can search the forum, for a  fairly recent thread about how to hook those up.
2239  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: lcd shift on: March 18, 2008, 11:12:42 am
thats possible, but i don't think you can  use the built in scroll function for that.

So you would have to implement your own, But that shouldn't be too difficult.

If you can imagine you have a "sliding window" of 16 chars that move over the text you want to display, then you just select 16 chars at a time, constantly increasing the starting point by one. When you have less than 16 chars left of your message you can either start over with the first cahars or padd with spaces.
2240  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: books recommendation on: March 16, 2008, 10:42:20 am
Tom Igoes first book "Physical computing" is very good as well, It describes almost anything you can imagine you would hook up to a microprocessor.

It does not use Arduino for it's examples, but various other micros, but it's easy to convert most af the software examples to Arduino code.
2241  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Can I use the programmed chip? on: March 12, 2008, 02:41:26 am
You will ned a few components, the 16MHz crystal for the clock and a couple of capacitors and the resetswitch.
And of course a well regulated power supply.

Heres a how to from the playground : http://www.arduino.cc/en/Main/Standalone
It's for the Atmega 8 but i believe that it's valid for the 168 as well

This link: http://www.instructables.com/id/uDuino-Very-Low-Cost-Arduino-Compatible-Developme/
might be interesting if you want to be able to reprogram the processor outside the Arduino board.

MikMo

http://www.mikmo.dk
2242  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Low Voltage Sensing with Arduino Mini on: March 12, 2008, 02:46:34 am
You could just use one of the build in analog inputs, it will convert a voltage in the 0 - 5 Volt range to a number in the 0 - 1023 range.

You do a periodic read of the analog pin and when it goes below a limit (you decide) you light the LED.
2243  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Printing? on: February 27, 2008, 03:40:58 am
After i have started to mess around with Arduino and physical computing, i sometimes almost cry when i think about all the stuff i have thrown away in my time as a sys admin. :-)

Printers, scanners, power supplys etc. etc.

Ohhh grief.
2244  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Printing? on: February 14, 2008, 04:43:20 am
It's probably possible. I see two potential problems though.

No new printers (or PC's) is equipped with parallel ports, so you would have to get your hands on an older printer.

Getting toner or ribbons for that type of printer is getting more and more difficult.

If datalogging is what is needed it would imho be much smarter to send serial data to a PC, or if size is a problem to some kind of storage device.
2245  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Printing? on: January 22, 2008, 05:29:01 am
Since most printers use either a parallel port (old printers) or USB, you can not connect Arduino directly to a printer.

But check this :

http://little-scale.blogspot.com/2007/11/arduino-printer-how.html

And this :

http://little-scale.blogspot.com/2007/11/bas120-pinout.html

2246  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: A complete noob question (please don't laugh) on: March 10, 2008, 03:28:17 pm
Trust us !  There is no such thing as a one pin LED, actually i can't think of any electronic componet having less than two (or more) pins

The other pin is hidden under the LED, it's the angle the picture is taken at that hides it.

Thr other pin from each LED is connected to the same row of holes in the breadboard as the resistors.
2247  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino or basic stamp on: February 19, 2008, 02:35:57 am
The pot for tyhe contrast is not strictly needed, you can use a fixed resistor, but the pot is really handy to figure out what size the fixed resistor should be :-)

Optocouplers and tyransistors are two ays to switch / drive stuff. You might need other things depending on how much current the things you want to control draw. Power transistors like TIP 120, or relays for instance. But i really depends on what you want to control.

2248  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino or basic stamp on: February 17, 2008, 04:10:09 am
That's a nice collection of things to get you started with all kinds of experiments that will allow you to build some experience as a foundation for your robotic project.

You should seriously consider adding a few potentiometers to your toolbox though.  Just a few 10K or 100K will do it.
They are really god for making experiments with analog input, and for controlling things.

After a while of working with the Arduino board you will probably also find yourself wanting some of the more specialized IC's like shift registers, multiplexers and stuff like that. These will allow you to increase the amount of inputs and output on the Arduino board. The good news is that most of them are very cheap. Other things you might want in the future is power transistors (like TIP120) or transistor arrays, (like ULN2003) and relays that will allow you to control stuff that draws more current than the Arduini board can supply.

I know you are going to have a lot of fun, i hope you will keep the forum posted on your progres :-)

MikMo
http://www.mikmo.dk
2249  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Where to start... on: March 08, 2008, 02:11:34 am
The variable configuration is really just a software problem. You can read the pots, and then decide what to do with the vaues in the software. It's really easy to reprogram the Arduino board. So you could just have a number of versions of the software, and then load the needed one to the Arduino board. This could of course end in a mess if you have to make changes to some of the basic stuff in the program. You would probably also want some kind of overlay for the frontpanel so it could reflect the different setups.

You can get motorized pots, but they cost a lot, and contolling them would as you have figured ouout your self, bring you to a compleatly different complexity level.

One thing to have in mind, is that drilling round holes in a front panel for rotary pots is easy, making long straight slots for slide pots is a pain in the neck.  (if anybody has a good method, please let me know :-) )

I have a small PCB layout for two 4051's giving 16 analog inputs to the Arduino board, at the expense of two analogg and three digital pins. Two of them and you would have 32 analog ins, plus the 2 left over on the Arduino board.
2250  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Where to start... on: March 07, 2008, 02:50:24 am
You can easily read slide pots with Arduinos analog pins.

The problem you will encounter first is that there are only 6 of them, so to read more than 6 pots you will ned to multiplex the analog inputs.

This might sound scary or difficult, but it's quite easy.

I have made a project where i read 16 slide pots with the help of 2 4051 analog multiplexre IC's this project can easily be expanded to read more pots.  

It would be relatively easy to make a generic controller with a number of slidepots (or rotary) and some switches, that could be used for variuous projects.

Check the 4051 analog multiplex example in the playground, or PM me for more info on how i did it.

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