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5056  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Magnetic field on: March 16, 2010, 05:12:53 pm
Man, I'm glad all you "oldster's" responded! Like I said, my heart is there if my age isn't.

I never got to play with punch cards, but when I first got into software development as a profession after high school, I was shown how to manually load a 9-track tape drive with vacuum columns. That was one of my first "duties" at the place I started at. Mostly it was to convert the half-inch tapes to cartridges for import into a database system.

I collect old computer junk, the older the better (well, at least until it becomes unaffordable). My wife and I recently hung a 16K core memory module card on our wall (it was sitting for a long time in my shop collecting dust); it was originally for an old mainframe or something, I think I paid scrap value for it.

I also have a few individual punch cards, one 9-track tape (had more at one time, but they are waaay too large to store and move with), my Altair (which needs major refurbishing), and numerous old books on computing and computational theory.

I love the stories; as far as FORTRAN is concerned, one time I converted some FORTRAN 3D graphics plotting code that I found in a library book into BASIC (TRS-80 Color Extended Basic on my Color Computer). That was many years ago...

5057  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Magnetic field on: March 15, 2010, 12:44:47 am
well, thanks for your reply,, sorry for what i've said before,,, and sorry im not a boy,,,,im a girl...and im using my phone last time i replied you,,, that's why im using zero..instead of o,,,, Embarrassed ..sorry...........


Something to keep in mind about tech boards and blogs like this: Number one, they are typically filled with guys, in many cases guys who have been online longer than many on the internet have been alive. In some cases, we cut our teeth on homegrown BBSs (bulletin board systems) dialed up in the dead of night on a 2400 baud (or sometimes less) modem. Some of us even ran our own systems. Mustang Software, a purveyor of one of the more popular shareware BBS systems, was in my backyard.

A few of us even predate the internet (not I, unfortunately; but my heart does - hell, my heart predates modern electronics and the airplane, if the truth were told) - I would guess there is at least one Arduino fan on these forums who has submitted code to an IBM 360 or other mainframe via a deck of cards - ouch!

So you can say we have likely seen or done it all, and when we see things like your character substitution, we may remember when we were "kids" on the machine, or when some other new passing "computer fad" was in vogue; for me, it brings a chuckle - but inevitably, some minor teasing occurs...

I am pretty sure I can say that we didn't mean anything by any of it; I know I didn't (my first thought really was a broken keyboard!).

Live, learn and laugh, especially here; this thing we call the internet is really the most amazing tool mankind has created thus far. Like any tool, used properly it can expand horizons, broaden minds, and incite further creativity. Take wonder and enjoyment from being alive during a time when this is possible, and laugh...

5058  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Magnetic field on: March 14, 2010, 02:42:57 am
Well, you know that's why I have a zero in my handle...

5059  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Magnetic field on: March 14, 2010, 02:35:55 am
I was going to say "maybe his 'O' key is broken" but I can see that isn't the case; he's probably just a sloppy typist - the 'O' and the '0' key are right next to each other, so he's probably fat-fingering it...

5060  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Magnetic field on: March 13, 2010, 01:35:34 am
The resistance will lower the current thru the coil, so I would say "yes"? What are you attempting to do, may I ask?
5061  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Program Arduino BT on: March 19, 2010, 06:57:59 pm
Yeah - I saw that post before, and I really don't know the answer for it; I have never used a BT arduino...
5062  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Program Arduino BT on: March 19, 2010, 06:25:16 pm
See this post:

I think it is possible - you'll need a USB->serial converter (FTDI cable or breakout board), plus you have to put the BT into "reset mode" (?) before you can use the RX/TX lines (pins 0 & 1).

But from what I can see from the ref design schematic:

...and that thread above - this is all you need to do (then pick the proper board for the connection, of course).

This is all an educated guess on my part, though...hope it helps!


5063  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: quick question about Vin pin on: March 19, 2010, 06:28:36 pm
If it is all going to be inside a box, could you just hook up to Vraw by soldering to the barrel plug connector pins on the board?
5064  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino with new chip on: March 10, 2010, 04:19:59 pm
Another dumb question:

Did you try removing the new chip and putting the original back in place (to verify the board still works)?

Maybe they sent you the wrong part? I can see how a vendor could mix up such parts (it isn't like there is a marker on ATMegas with bootloaders or something)...

Maybe today is the day to learn how to put a bootloader on the chip!

5065  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino with new chip on: February 23, 2010, 01:45:30 pm
If you don't know if the chip has a bootloader or not on it, can you tell us where you bought the chip (if you bought it online), and what you bought (a link to the product or description)?
5066  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Android and Arduino on: March 18, 2010, 01:47:32 am
What do you think? Is it possible for someone with limited programming experience, but ok knowledge about linux? Taking small steps?

Well, small steps and planning are certain the best ways to approach a project like this, if your programming experience is limited. That bluetooth API looks like it might open up some interesting possibilities for the Android platform; I am certainly going to have to look into it deeper myself. Personally, if I were in your position, these would be the general steps I would take (and each step should be broken down into further sub-steps, of course):

1. Experiment and play around with the blink example. Understand the hows and whys of the circuit (very basic, I know). Perhaps also add a switch to control the blinking or something, to learn how to read switches properly.

2. Play with reading and writing serial data to/from the Arduino, over the USB serial connection, using the console. Eventually use the knowledge to control the LED blinking, or read the status of the switch.

3. Play around with Java on your PC; implement some simple console programs. Then implement serial communications, following up with communications with the Arduino; control the blinking/read the switch using your Java coding skills.

4. Once you are at this point, then it would be time to start to "sever the cord"; you could at this point move to developing on Android with your phone, or you could get a bluetooth adaptor for your PC (and whatever you need for the Arduino, like a bluesmirf modem), and continue development on the PC, migrating to Android when you have mastered the bluetooth communication.

5. Once you have a simple Android app running and sending/receiving bluetooth commands/data to/from the Arduino, then begin to fancy up the application with GUI elements and such.

As long as your aware that the project isn't simple (which you are), and are willing to stick to it, despite having to take a large number of small steps, you will get there eventually - you seem to have an idea and a plan of some sort; take it slow, don't get frustrated, and don't take shortcuts if you can help it. If you have problems, post here or on another forum (ie, on an Android SDK forum for those questions, of course).

Above all - have fun! Good luck with your project!

5067  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Android and Arduino on: March 17, 2010, 04:37:04 pm
I have an HTC Dream and you don't need to root the phone to start creating applications. Just head over to and download the SDK, read the tutorials and get started developping on Android.

I know this - I own a G1.

What I was trying to convey is that he isn't trying to create a standard application (which is complex enough to create, for anything beyond "hello world"), he is wanting to do serial comms over bluetooth - I am not even certain whether bluetooth access is supported in the SDK currently (I know host USB isn't, I was trying to find a solution to that - in fact, I couldn't find any solution, even as a slave, for USB access in the SDK - there was barely enough access to the microphone, and even that has problems that make audio-style apps like in the iphone nearly impossible, from what I can gather).

I am not saying any of this is "impossible"; it is just that the OP stated they were a "noobie", but wanted to jump into building an application combining two different machines and development environments, and throw serial comms over the top. That's ok, provided you have the skills and experience to tackle it (and you'll probably still be pulling your hair out); but with the description of "noobie", I was just curious what kind of "noobie" they were?

Maybe they are a professional Java developer on the Android SDK, and have developed bluetooth interfaces to PCs, and they just lack Arduino experience? They'll probably do ok if they can get their heads around the hardware interface end on the Arduino (which they can probably figure out). But if they are a real noobie with very little software, hardware, etc experience - they are likely getting in over their head.
5068  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Android and Arduino on: March 16, 2010, 04:39:29 pm
What you would need would be something like this:

I am curious, though, of your describing yourself as a "noobie"; is the knowledge of using the Arduino the only thing you lack?

Because I am assuming you have linux sysadmin knowledge (you may need to root your phone for this application - maybe just for debugging), java software development skills (and knowledge of the Android OS SDK), serial comms skills, C/C++ dev skills (inasmuch for the Arduino programming), etc.

If you are lacking in any one of those areas (ok, maybe the linux sysadmin piece can slide), you are going to find yourself overwhelmed VERY QUICKLY (and you may brick an expensive phone to boot! You never know...).

You might want to clarify where your skillset lies; if you just lack knowledge of microcontroller and electronics interface skills, that's one thing - but if you are more "noobie" than that, you may be biting off more than you can chew, so to speak...

That's a road to frustration and defeat, IMHO...

5069  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino + caméra on: March 17, 2010, 07:04:32 pm
Well, my french is really bad - but I think you're asking if it is possible to connect a cmos camera to an Arduino Mega, with a wifi shield (or something), and send the video to a PC to record movement? Or something...

The quick answer is "no" - the mega doesn't have enough power to process and stream video, AFAIK. There might be another way to do it using another Atmel processor (and the avr toolchain), but as far as I know, it isn't possible with an Arduino or Mega.

Unless you're asking something completely different.


You might also try posting your question in the Français forum:

Good luck!

5070  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Robot: problem with load current on: March 17, 2010, 04:40:31 pm
One motor is faster than another one and it prevents the robot to move straight. I did one very stupid thing is that I added a 100O ohm resistor parallel to the power pins of the faster motor.

That is not really the proper way to make your robot move straight.

The proper way involves optical encoders on the wheels (quadrature encoders if you care about direction), along with PWM, so you can monitor the speed of the wheel, and speed up or slow down each motor to make them match speed.

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