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1  Using Arduino / Installation & Troubleshooting / Re: Arduino v 1.0.2 with Mac OS 10.8.2 on: November 09, 2012, 04:37:01 pm
I get that same "'/dev/tty.Bluetooth-Modem' already in use" error sometimes too. It has something to do with plugging and unplugging the usb cable to the Arduino. What you need to do is go to the Tools menu, select Serial Port and choose one of them with USB. Then it should work. Hope that helps.
2  Using Arduino / Installation & Troubleshooting / Re: Arduino v 1.0.2 with Mac OS 10.8.2 on: November 09, 2012, 03:03:20 pm
You can always download any version of the Arduino software at:

http://arduino.cc/en/Main/Software
3  Using Arduino / Installation & Troubleshooting / Re: Arduino v 1.0.2 with Mac OS 10.8.2 on: November 09, 2012, 07:02:14 am
I had a similar problem using the Arduino IDE v1.0.2 on Mac OS X 10.8.2. I reverted back to Arduino v1.0.1 and everything works fine. Hope that helps.
4  Community / Exhibition / Gallery / Two player, Jeopardy! style buzzer game with ATtiny 85 on: November 04, 2012, 04:11:24 pm
I recently built this two player, Jeopardy! style buzzer game prototype with an ATtiny85 chip.
and thought I would share it with the community. Basically, the players buzz in by pressing one of the momentary push button switches on either end of the board. The first to buzz in, sounds the buzzer for a second and then lights up their LED for about five seconds. The player has those 5 seconds to answer, before the opposing player can buzz in. It's not too sophisticated, but I'm proud of it.

Eventually, I like to have big, whack-a-mole style buttons with internal lighting, instead of the tiny momentary push button switches.

If you have any thoughts or suggestions about the project, please let me know. You can read more about the specifics of the project on my blog: joesgizmos.wordpress.com.
5  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 22, 2012, 02:19:20 pm
Great job getting a clone of the arduino-tweet web app working! Would you mind detailing the process?
6  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 12, 2012, 11:58:51 pm
I agree with Drew that we need to be respectful of Neocat's web app and limit the amount of tweeting done by our Arduino devices. Also, I like the idea of throttling users that tweet too frequently.

I have two questions:

1. How could we decide on an acceptable number of tweets a device is allowed per a given period of time?

2. Is one anyone and experienced enough programmer to help Neocat setup the throttling that Drew has proposed?

I'm still looking into the idea of creating a clone of the arduino-tweet.appspot site as well. Thanks for your ideas and feedback.
7  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 11, 2012, 01:16:50 pm
If you're interested setting on your own web app, it appears NeoCat's code for arduino-tweet.appspot.com is on GitHub. I don't understand if the code is open source or not. You could ask @NeoCat on twitter if you could use it. Here's the link:

https://github.com/NeoCat/ArduinoTweetLib-server

Personally, I don't know much about setting up and hosting web apps, but I would consider trying it (with NeoCat's permission, of course). There is still the matter of modifying the Arduino Twitter library to support a server different than arduino-tweet.appspot.com, but I believe that could be done.
8  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 11, 2012, 11:07:43 am
Quote
Is there an 'easy to use' alternative that one could use self-hosted?

That's a good idea Paul about using PHP and MySQL, but that does require having a server or computer setup. My tweeting Arduino devices standalone. We would also have to make significant changes to our existing Arduino setups.

Another idea would be to setup a clone of NeoCat's Arduino-Tweet site on Google App Engine. We'd need NeoCat's permission, and likely his/her help, and would have to create a new Arduino Twitter library specifically for the cloned site. Just a small group of us could use the clone site. This way we would only have to make minor changes to our Arduinos. What do you think of that idea?
9  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 10, 2012, 09:48:29 pm
You're right DrewC, the arduino-tweet.appspot.com isn't working again. Thanks for the info.

Looking at appspot.com, it is a platform for web applications running on Google's servers. arduino-tweet.appspot.com is a web app programmed by NeoCat to allow our Arduino devices to tweet. I think that maybe this web app is proving too popular for the free service offered by Google.

The page states:
Quote
Every Google App Engine application will have enough CPU, bandwidth, and storage to serve around 5 million monthly pageviews for free. You can purchase additional resources at competitive prices when you need them and you'll pay only for what you use.

It appears we Arduino Twitter users have used all of the free bandwidth provided by Google.

Any ideas for solutions?
10  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 10, 2012, 03:19:45 pm
Thanks for the info Mbuchelly. Good idea to send a tweet to @neocat. The arduino-tweet.appspot.com site appears to be working again, as my device has made three successful tweets today.
11  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 09, 2012, 12:42:53 pm
Thanks again Steph. My Arduino tweets aren't going through either. I guess we just have to wait and see.
12  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 09, 2012, 06:45:02 am
As of right now, my device is able to tweet just fine. The problem appears to be solved.
13  Using Arduino / Networking, Protocols, and Devices / Re: NeoCat Twitter Library. Tweet fails with code 500 on: July 08, 2012, 10:47:14 pm
Thanks for the info Steph. I've been looking into the problem and I believe it's something to do with the arduino-tweet.appspot.com website exceeding it's quota. I wish I knew more about it.
14  Using Arduino / Networking, Protocols, and Devices / NeoCat Twitter Library. Tweet fails with code 500 on: July 08, 2012, 07:02:37 pm
Hello Arduino Forum,

I'm using NeoCat's Twitter Library for Arduino (http://arduino-tweet.appspot.com/). I have previously used this without issue, until today when I've been getting the following error message:

tweet failed: code 500

According to the twitter developers site, this error indicates an internal server error (see https://dev.twitter.com/docs/error-codes-responses for more details).

I have tried tweeting with two separate Arduino devices. One an Arduino Uno R3 with Ethernet Shield; the other a Botanicalls Kit (http://www.botanicalls.com/. Both fail to tweet today. However, I did successfully tweet from the Botanicalls on 6/24.

Please let me know if you are having this same error or have any advice on the situation. Thanks in advance,

15  Community / Exhibition / Gallery / First Real Arduino Project. FSR, LED and LCD display on: June 02, 2012, 07:55:17 pm
Hi,

I've been learning Arduino for the past couple of weeks and recently made my first original project. It borrows from Getting Started with Arduino by Banzi and the Arduino tutorial for the LCD.

It measures the pressure on a force sensitive resistor and lights an LED according and displays the amount of pressure (a number between 0 - 255) on the LCD screen.

Here it is:
Code:
// Force Sensitive Resistor(FSR) to light LED analogly according to pressure
// and display amount of pressure on an 16*2 LCD screen

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // set pins for LCD
// set global variables
const int LED = 9; // LED connected to pin 9 for analog write
const int FSR = 0; // FSR connected to analog pin 0

int level = 0; // variable for the level of force applied to the FSR

void setup() // run once to setup
{
  pinMode (LED, OUTPUT); // LED set as output
  //analog pins are automatically set to input
  lcd.begin(16,2); // set up LCD number of columns and rows
  lcd.print("Pressure Level:"); // display message on LCD
}
void loop() // repeated routine
 {
   // first, read the pressure level and set brightness of LED
   level = analogRead(FSR)/4; // read level of pressure on the FSR
   // divided by 4 as analog read is 4x sentive as digital write
   analogWrite(LED, level); // set brightness of LED to pressure level
   delay(100); // wait to see the effect
   
   //display pressure level on the LCD screen
   lcd.setCursor(0,1); // set cusor to second line, first spot
   lcd.print(level); // display level of pressure
 }

I understand that it doesn't have much of a practical purpose, but I was still proud that I was able to put something like this together with little knowledge of micro controllers and programming.

I'll post a photo soon.

I blogged about it here:
http://joesgizmos.wordpress.com/2012/06/02/project-1-force-sensitive-resistor-led-lcd-display-and-arduino/

Please let me know what you think and if you have any suggestions.  Thanks,

Joe
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