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61  Community / Bar Sport / Re: Your latest purchase on: May 12, 2011, 09:44:50 am

Rigol 50MHz scope Works great.
62  Using Arduino / Microcontrollers / Re: Arduino Tiny on: May 02, 2011, 09:35:15 am
next goal is to get ATtiny Arduino running as an I2C slave.

There has been some discussion on the forum.  But, I've not done anything I2C so I won't be much help.  If you do get something working, please take the time to report about your success.  Even something as simple as "I got I2C slave working" is helpful to someone considering it as a solution.  At least they know it is possible.

Kinda makes me wonder why I bother . . .

or am I missing something?
63  Using Arduino / Networking, Protocols, and Devices / Re: Sparkfun as supplier on: May 01, 2011, 09:01:35 pm
64  Using Arduino / Microcontrollers / Re: I2C on the ATtiny85 on: April 02, 2011, 05:22:25 pm
Is there any fundamental reason why this would not work on attiny85?
I don't think there is. It was just a bit over my head so I didn't take the time to do it.

If you add those, let me know and I'll update the libs I put on the Playground.
65  Using Arduino / General Electronics / Re: interfacing dtmf with atmega644p on: March 27, 2011, 12:21:40 pm
I have code for DTMF receive (with interrupt) and transmit on my blog . . .
66  Using Arduino / LEDs and Multiplexing / Re: Multiple MAX 7219/7221 for "Christmas card" by Thomas123 in the old forum! on: March 22, 2011, 02:05:04 pm
In regard to driving multiple MAX72xx, have you looked at this ?
67  Community / Bar Sport / Re: Geek gags on: March 22, 2011, 09:29:00 am
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
(Douglas Hofstadter - "Gödel, Escher, Bach: An Eternal Golden Braid")

(a hell of a book)
68  Using Arduino / LEDs and Multiplexing / Re: Shift registers or MAX 7219 on: March 21, 2011, 02:39:19 pm
8x8 matrix?
How many colors? (one, RG, RGB)
Common cathode, common anode, don't know / care?
69  Using Arduino / Installation & Troubleshooting / Re: Preferences file on: March 20, 2011, 09:50:51 pm
You can save your preferences.txt file in your IDE folder by doing the following . . .

Edit the preferences.txt - the one in the "lib" folder - under the IDE install.
Remove the comment mark before "settings.path=data". i.e.

# if you don't want settings to go into "application data" on windows
# and "library" on macosx, set this to the alternate location.

This will put your user preferences.txt in the "data" folder in the IDE.
(You may have to make the "data" folder and copy a preferences.txt into it.)
70  Using Arduino / Networking, Protocols, and Devices / Re: synchronous master-slave communication on: March 17, 2011, 12:12:00 pm
I've been able to find no examples online of anyone sending requests from a master  for the return of specific data from a slave.
I agree with this as stated, however, just for other's future reference, there are 6 short example sketches in the examples folder under the wire lib. Four of these are the various combinations of master and slave comm - but none for an entire comm loop. I only mention this because it seems that lately many people are not aware of the examples in the lib folders.

bigfun, I understand your situation. I've had similar problems. What I've come to believe is that response from the Slave must be almost instantaneous after the Masters request. (I remember one project I had where the slave would immediately respond to that master with a value of how long it must wait until making the request again.)

I also know about "clock stretching" on the Slave side but haven't tried it. It might be simply a matter of the slave setting the clock pin low with a digitalWrite.

In any case, I'm interested in how this thread develops, and what Nick has done.

71  Using Arduino / Sensors / Re: geiger tube on: March 15, 2011, 10:33:24 am
Sadly, there has been a huge up-tick of interest in Geiger counters.

I have project plans for an Arduino Geiger counter on my blog . . .

They include the circuit for a 555 based 500V power supply and info and links on Geiger tubes.

I agree with Radioactive that a metal jacket tube is the best bet for a start. They are indeed more robust. (I've heard that sometimes the surplus tubes that use mica windows and such, don't survive the pressure difference experienced in shipping.)

I've had good luck with SBM-20 metal tube, and would recommended it. I found it worked pretty well in detecting beta if the sample is held near the tube. (I've gotten up to 6000 CPM with old lantern mantles that used thorium-321.)

I found the glass walled tube, such as the CL-3BG to be much less sensitive.

Again, there is more info in the blog.

I'd also like to say here that thoughts, prayers, and hopes go out to the Japanese people who are dealing with this current tragedy. I wish you all the best.
72  Using Arduino / Project Guidance / Re: Hi Guys. Completely New Here. Need Help With A Bill/Coin Operated Fortune Teller on: March 13, 2011, 03:12:09 pm
First of all, what you describe sounds doable. However, it's a big project, and there will be a lot to learn. It will probably take months in your free time. You'd better be interested in the journey as well as the destination.

It's a great project though, and it will take you into a lot of areas of using the Arduino.

I'll assume the bill/coin acceptor and the ticket printer are serial devices, so working with them is one area. Servos is another. You might start with them, but to do that you will need to know the basics. Do you have programming experience? Any experience with the Arduino yet? If not, that's where you will really have to start.

Good luck and have fun.

73  Using Arduino / Networking, Protocols, and Devices / Re: My project doesnt work on my ATTINY85 on: March 12, 2011, 08:50:53 pm
Keep in mind that if are not using an external crystal / resonator the clocks between the two ATTiny85's can vary widely. You might try adjusting your "error gap".

Are you using the default fuse settings for both chips? (1 MHz)
74  Using Arduino / Microcontrollers / Re: attiny85 fail - please help on: March 12, 2011, 08:23:03 pm
And after loading the ArduinoISP you disabled reset so it won't reset when you load the ATtiny85 sketch?

It's right there in the toutorial - oh wait! - it's not! Just a small omission that has caused, and will cause, hours of frustration for those not in on the secret.

See . . .
75  Using Arduino / Networking, Protocols, and Devices / Re: Infrared decoding help on: March 12, 2011, 02:23:54 pm
I use that particular soundcard scope and it's great - the best I've found. The guy did a hell of a job.
However, lately I've been working on ATtiny IR receivers and transmitters, and a soundcard scope just doesn't cut it.
At the moment, I'm not inclined to spend 100's on a real scope - but yard sale season is coming.  smiley
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