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2326  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: analog multiplexing and sensors on: October 21, 2007, 02:31:17 pm
What kind of sensors ?

If they put out a voltage you read from an analog input, it is the same as reading a potentiometer.

I have used 16 potentiometers on 2 multiplexed analog inputs and had no problems with latency.
2327  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Basic analog input questions on: October 27, 2007, 04:59:43 am
Another thing to note is that LDR's like all resistors come with a build in tolerance.
For som LDR's this tolerance is quite high, menaing that two LDR's that are the same type, and look identical, might have quite different resistances given the same amount of light.
2328  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How long can arduino run off a 9v battery? on: October 25, 2007, 01:35:13 am
I agree.  Letting the Arduino monitor it's own power is smart.
Do a little write up and put it in the playground. Many people could benefit from a design like that.
2329  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How long can arduino run off a 9v battery? on: October 24, 2007, 01:07:11 pm
This is very difficult to say anything about.

Different LED's draw different amounts of current, and the processor on the Arduino board will probably use more or less current depending on how your program is written.

You can try to meassure the current it draws when "idling" and when the LED's are on by inserting a mA meter i seriers with the battery.  If you know the capacity of the battery in mAh you can do a qualified guess.

You could also wire 2 or 3 batteries up to get a much longer battery life time.

Or you could use 6 AA batteries in a suitable holder, they will give you 9V, but last much longer than a single 9V block cell.
2330  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: removing atmega168 for standalone? on: October 23, 2007, 02:03:38 am
Or you could check the Real Bare Bones Board:

http://www.moderndevice.com/RBBB.html

It think it will be hard, for a DIY project, to beat the 11$ pricetag and the ultra small footprint.

MikMo
http://www.mikmo.dk

2331  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino and multipel analog inputs on: October 20, 2007, 09:41:47 am
If i understand your question correct, you want to swap sensors / input devices on the fly ?

It cold be possible, but only if the sensors / input devices act in the same way. Analog input read resistive devices like potentiometers, or devices that send out a voltage between 0 and 5 volts.

Some sensors are read in a different way.

If all your sensors are in the first group, then technically you coild swap the on the fly, but there would probably be issues with sacling amd converting the input.

MikMo
http://www.mikmo.dk
2332  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help me get started with Arduino on: October 08, 2007, 07:38:08 am
If you have experience with the basic stamp i think you will feel at home working with Arduino.

Of course the programming language is C / JAVA like but the number of instructions are limited so it is very easy to learn. And the basic hardware concepts like digital in and out - analog ind and out - PWM  are the same as the BASIC stamp. And the Arduino platform is cheaper than the basic stamp.

The really cool thing about Arduino is the existing community. Thre are litteraly thousands of people working with it, some with a lot of electronics experience, some with a lot of programming experience, and a lot without much experience yet. But if you look around in the forum and in general on the net, there is an asthonishing amount of information available. And there are lots of nice people ready to share and help.

MikMo
http://www.mikmo.dk
2333  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help me get started with Arduino on: October 07, 2007, 01:42:55 pm
The built in USB on the Arduino boards, are really a serial port in disguise.

So seen from Flash on your PC it will look like a serial  port (COM port).

When you download and install the Arduino software on your PC, there's also a driver that makes it possible to use the "simulated serial port" .

So yes it is possible, and for the comunication alone you need nothing besides the USB cable.

This is also true if you want to communicate with other environments than Flash. For instance MAX/MSP.
2334  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help me get started with Arduino on: October 07, 2007, 12:52:08 pm
That depends on what you want to do.

I asume you want to interface something to Flash via the Arduino board. Whatever that something is, determines what you need.

I have not used flash myself, but a couple of things you could do is to make Flash react to pusbuttons or switches, or potentiometers.

If you have not already read this, you should:

http://www.arduino.cc/playground/Interfacing/Flash

Good luck
2335  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Upgrading old Arduino boards ? on: October 07, 2007, 06:40:31 am
Thanks.

I should not be too difficult to get the bootloader burnt on a 168. Or just by one already burnt.
I think i'm going to give it a try myself, because i'm thinking about a few projects where i want to develop something with the Arduino board, but use the Atmega168 "standalone" after initial development.

MikMo
http://www.mikmo.dk
2336  Forum 2005-2010 (read only) / Frequently-Asked Questions / Upgrading old Arduino boards ? on: October 06, 2007, 06:24:39 am
I have two older Arduino boards, from the first generation with USB.

Can i upgrade these boards by just replacing the Atmega8 processor with the 168 processor ?

If it is possible, do i need to make other changes to the board ?

Thanks
MikMo

http://www.mikmo.dk
2337  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: such thing as a led socket? on: September 28, 2007, 11:35:02 am
Yes. those pin sockets are nice. And you can just break of 2 or 3 or how many you need.

I used a few when i was testing a circuit where i had to try a whole lot of different capacitor /resistor combinations. It works just fine. Just one word of warning, they are no good for permanent  circuits, since the components come loose from them quite easy. But for testing they are fine.
2338  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: My n00b thread ¬†<assumed FAQ> on: September 25, 2007, 03:17:19 pm
Are the robots going to be moving around, then i think the Blue tooth Arduino board might be a good solution.

For expanding Digital or analog In / out puts see here:

http://www.freeduino.org/#index  

look under M for Multiplexing, there you will find links to a number of articles about expanding the number of analog and digital input and outputs.
2339  Forum 2005-2010 (read only) / Bar Sport / Re: I really don't miss namespace and whatnot! on: December 31, 2010, 10:51:27 am
I just sold my house and had to go through all my old stuff.

I found some old Turbo Pascal manuals and started to hunt for the disks just to see if it could still install. But the disks were nowhere to be found.

I learnt programming in Pascal, and Turbo Pascal was my language of choice until i started programming for Windows.

Ahh, those were the days. Programming usually consisted of 20% of your code doing what you should do and the other 80% spent on a "user interfcace" of some kind.

I made my first ever money programming, creating a database with the "Turbo Pascal 4 database toolbox".



And i you tell the young kids that they won't believe you :-)
2340  Forum 2005-2010 (read only) / Bar Sport / Re: Professions?? ¬†Funding?? on: March 08, 2010, 05:20:18 am
I work as a software developer in a small IT consulting company. I work mostly with Microsoft products, writing .net code, SQL server stuff, and i'm   also working a lot with the open source CMS system Umbraco (really cool system).
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