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5611  Using Arduino / General Electronics / Re: Thermistors reading different values in the same spot? on: March 27, 2012, 06:30:08 pm
The difference between the two is 0.03k or a difference of about 0.3%.  Pretty good!
5612  Using Arduino / Project Guidance / Re: Hello everyone Please give me your guidence on my project on: March 27, 2012, 05:37:05 pm
You're not the first to ask about those glasses.  They appear to be made from PCB material and use the PCB traces for horizontal connections and very fine wires for vertical connections.  Aside from that they are probably a plain 8x24 matrix.
5613  Using Arduino / Sensors / Re: Touch sensor with sound. on: March 27, 2012, 05:30:48 pm
> Do I need an ethernet cable to be able to get the RSS data?
You need Ethernet, WiFi, or a program running on a PC with Internet access to pass the data through the USB cable to the Arduino.

> and will I be able to trigger sound with a touch sensor?
Yes.  You can use a touch sensor to do anything you like.
5614  Using Arduino / Programming Questions / Re: Debugging and advice needed (Do-While-Loops with several conditions?) on: March 27, 2012, 05:28:03 pm
2.) Can I combine more than one condition in a "do .. while" loop?

You can only have one boolean expression in the do {} while (boolean); but that expression can be very complex and can include the && (And) and || (Or) operators so you can check for BOTH sides true (true && true) or EITHER side (true || false).
5615  Development / Other Software Development / Re: AVRProjectIDE with version of Arduino 1.0 on: March 27, 2012, 05:16:40 pm
Did you include the appropriate pins_arduino.h like from hardware/arduino/variants/standard/pins_arduino.h?
5616  Using Arduino / Sensors / Re: Max Arduino Uno Ultrasonic Sensors on: March 27, 2012, 09:40:51 am
I'm guessing if we're maxed out on 16 the best route would be to run a second board to handle the LED's and sync them up?

The I2C bus only uses two pins (A4 and A5).  You still have about 17 pins for other stuff.  With 8 pins you can make a 4x4 matrix display of your 16 LEDs.
5617  Using Arduino / Sensors / Re: Max Arduino Uno Ultrasonic Sensors on: March 26, 2012, 10:15:49 pm

You can set the I2C address of the module to any one of 16 choices.  That means that "up to 16 sonar's can be used" on a single I2C bus such as is found on the Arduino.
5618  Using Arduino / Microcontrollers / Re: ATmega328 optiboot with ftdi breakout? on: March 26, 2012, 12:39:57 pm
> So is it possible to program the chip and monitor serial using an ftdi breakout?


> and if so how, or do I need to burn the duemilanove bootloader?

Should work fine with the UNO bootloader.  Did you implement auto-reset?  If not you will have to manually reset.
5619  Using Arduino / Project Guidance / Re: External Oscillator on: March 26, 2012, 12:34:55 pm
You can use any external oscillator you want, as long as you pre-scale it to 16 MHz.  For example you could use a 64 MHz oscillator and a divide-by-4 external pre-scaler to feed 16 MHz to the ATmega.
5620  Using Arduino / Sensors / Re: Problem with ADXL335 on: March 26, 2012, 12:26:48 pm
The problem seems to be periodic.  What is the period of the bursts?
5621  Using Arduino / Project Guidance / Re: 10X11 led matrix [HELP] on: March 26, 2012, 11:10:45 am
The MAX7219 does 8X8.  That's easy for an 8x8 part of your 10x11 array.  The remaining 46 lights can be put anywhere you like in the other 8x8 matrix.  I'd probably use two rows to pad one side to 8x10 and three rows to pad the other side to 11x8.  That leaves three rows to control the 3x2 block to fill in the corner.
5622  Using Arduino / Sensors / Re: Quantum light sensor on: March 26, 2012, 10:59:13 am
The sensor is NOT an LDR or photoresistor.  It's a photovoltaic (generates current) detector.  It typically generates 5 microamps at 1 milimole per second per square meter.  Since the Arduino measures voltage and not current  Your sensor should have come with a calibration value to to replace the 'typical' value of 5.  To convert from current to voltage multiply by .604.

Measure the the voltage across the sensor, divide that by 0.604 to get millivolts, divide that by the calibration value to getmillimoles per second per square meter.  You will probably want to use a the lowest available analog reference (Aref) value to get a reasonable useful range of voltage readings.
5623  Using Arduino / Project Guidance / Re: calculate relative direction to destination on: March 26, 2012, 10:35:48 am
is there a particular reason you didn't use the "course_to" method?
The GPS-determined heading fluctuated too much at low speeds because it depends on motion to determine heading.  The compass measures absolute heading against an external reference (Earth's magnetic field).
5624  Using Arduino / Installation & Troubleshooting / Re: Ports, Power, Servo problems on: March 26, 2012, 09:41:31 am
I even downloaded Arduino 1.0 and tried running "Sweep" still no servo movement.  Any help would be greatly appreciated.

Either you have things wired wrong or the Arduino outputs have dies or the Servo inputs have died.

Are you sure the Arduino ground and the Servo ground are still connected?
5625  Using Arduino / Audio / Re: HELP TO STORE 8BIT,8KHz Mono PCM AUDIO SAMPLES in ARDUINO on: March 26, 2012, 09:36:58 am
36 seconds at 8000 bytes per second is 288,000 bytes.  The ATmega328P has only 32,000 bytes of FLASH memory.  You will have to find some other way to store the sounds.  Several companies make 2 megabit (256K x smiley-cool and larger serial EEPROM chips for under $1 each.
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