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16  Using Arduino / Programming Questions / Flash.h <SOLVED> on: November 15, 2012, 12:31:17 am
I downloaded the Flash4 library from the link in the playground.

when I try the following:

#include <Flash.h>

FLASH_STRING_ARRAY(myArray, PSTR("Hello"), PSTR("World"));

void setup() {
}
void loop() {
}

The IDE responds with the following:

error: statement-expressions are not allowed outside functions nor in template-argument lists

FLASH_STRING(), FLASH_TABLE() seem to work fine.

Any help would be greatly appreciated. Thanks smiley
17  Using Arduino / Displays / Re: ITDB02 + Shield 2.0 = Touch not working on: November 12, 2012, 10:38:07 am
How do you get the SevenSegNumFont or SevenSegNumFontSpace to display the correct value for the decimal point?  It shows up as '8'
18  Using Arduino / General Electronics / Re: Another Noob Power Question on: October 17, 2012, 11:13:15 pm
I knew it!, I just knew it, just like that dream of winning the lottery, so real, so vivid, until I woke up smiley

I havn't gotten my starter kit yet and am going nuts  smiley-mr-green
19  Using Arduino / General Electronics / <SOLVED> Another Noob Power Question on: October 17, 2012, 10:14:11 pm
If you start out with a regulated power source, say 35A of 12V from a converted ATX power supply

In a simple voltage divider as I understand it anyway,

                       R1              R2
+12V        o----\/\/\----o----\/\/\------o  GND
             V1               V2                

How do I find out what values for R1 and R2  if  V1 = 12V and V2 = 7.5 @ 2.0 Amps

R1 = ?
R2 = ?
V1 = 12V
V2 = 7.5V


And since the V1 = regulated 12V and isn't supposed to fluctuate (too much)
would I not get a fairly constant value from V2 ?

This would allow for powering a couple of legacy devices that require a regulated 7.5 V as well as powering the arduino itself at 7.5V instead of 12V making arduino regulator work cooler.

I'm gonna burn up so much stuff... better tripple my parts order!

Thanks guys...
20  Using Arduino / Motors, Mechanics, and Power / Re: Power Supply For Arduino on: October 15, 2012, 11:19:25 pm
hmm, ok, well reverse is what cause both of my auto accidents lol...

could you tell me what kind of diode I need?

And....

How to wire it up?

I am so sorry to be a noob, but I am so happy cause you guys ROCK SO HARD!

I love the idea of using the 5V rail off the ATX supply for the arduino, cooler is better smiley



21  Using Arduino / Motors, Mechanics, and Power / Re: Power Supply For Arduino on: October 15, 2012, 09:21:44 pm
I thought I read somewhere that the minimum voltage should be 6.35 volts to correctly operate the integrated reglulator.

Given that you must obviously know what you are talking about, I must assume that you were talking about making the 5V supply connection to the 5V Pin instead of the dc power jack and I further assume that the 5V Pin does not use the integrated regulator?

Is this correct?

by connecting this manner will I still have 3.3V?


22  Using Arduino / Motors, Mechanics, and Power / Power Supply For Arduino on: October 15, 2012, 05:11:40 pm
Can an Arduino 2560 run comfortably at a regulated 12V?

I would like to power my projects with a converted ATX power supply and power the Mega from the 12V rail.

Or do I need to step it down to 9V

I read somewhere the upper voltage limit was 12V

Dropping to 9V adds more components, cost, failure points to my project.

Thanks In advance....
23  Using Arduino / General Electronics / Re: hydroponics nutrient sensor on: October 13, 2012, 11:07:08 am
I seem to remember dropping like $600 for the unit with inline probes expensive I know, but then....
24  Using Arduino / Displays / Re: TFT 3.2 + Touch + SD Card + Shield on: October 12, 2012, 12:14:19 pm
Thanks Guy's !

25  Using Arduino / General Electronics / Re: LED's & Relay Boards on: October 12, 2012, 12:08:03 pm
In further research of my relay options, I came across these relay boards available in 2, 4, 8, 16 relay's.

http://www.ebay.com/itm/New-5V-2-Channel-Relay-Module-Shield-for-Arduino-ARM-PIC-AVR-DSP-Electronic-10A-/120973608102?pt=LH_DefaultDomain_0&hash=item1c2a96c4a6

Since I use a converted ATX power supply for my projects 12V requirements, It seems I have a spare 36 Amps on the 5V rail smiley

With the above relay board, do I remove the jumper between JD-VCC ^ VCC on the three pin header and connect my atx supply to the VCC & GND pins on the 3 Pin header?

Then Connect the 4-pin header GND to arduino GND and IN1, IN2 TO D5, D6 and leave the VCC Pin empty?

The current older boards I have use 12V coils on relay and only have TTL pins for the connection, ie GND + 8 TTL, The 12V is on screw terminals.



26  Using Arduino / Displays / <SOLVED> TFT 3.2 + Touch + SD Card + Shield on: October 11, 2012, 07:21:14 pm
Is there any reason I can't or shouldn't use a ribbon cable to connect either the TFT module to the shield OR to connect the shield to the arduino mega?  

I got a really nice alarm system box with hinged door and would like to mount the TFT remotely from the arduino. I suspect the cable length to be about 12".

27  Using Arduino / General Electronics / Re: hydroponics nutrient sensor on: October 11, 2012, 06:16:38 pm
If you want a bench mark lab quality unit take a look at the hanna hi98143, which has a 4-wire conductivity circuit, pH circuit and a temperature thermi and outputs 0-4 V.

don't have a url, but this is the unit I use for calibration of my other less expensive solutions....

28  Using Arduino / General Electronics / Re: LED's & Relay Boards on: October 11, 2012, 06:13:17 pm
Thank you so much for the responses.

I thought running a led in parallel with the relay board would work, thanks

I look forward to being a member of this community smiley
29  Using Arduino / General Electronics / Re: hydroponics nutrient sensor on: October 10, 2012, 08:27:36 pm
This is a good price for lab grade stuff
http://www.ebay.com/itm/Conductivity-Circuit-Sensor-for-Arduino-/200779531430?pt=LH_DefaultDomain_0&hash=item2ebf6484a6
30  Using Arduino / General Electronics / LED's & Relay Boards on: October 10, 2012, 08:03:40 pm
Old School Programmer - ARGH ( COBOL ) - Yes I still pump blood, lol.

New to arduino & electronics and don't want to burn anything up...

HardWare:
Arduino: Mega 2560 - RadioShack
Relay: 12V 8 Channel Relay Module Expansion Board For Arduino, PIC, AVR, DSP, ARM, SCM

Relay Link: http://www.ebay.com/itm/12V-8-Channel-Relay-Module-Expansion-Board-For-Arduino-PIC-AVR-DSP-ARM-SCM-/221028171239?pt=LH_DefaultDomain_0&hash=item33764e3de7


Q: Can I add an LED between the arduino pin and the input pin on the relay board?

    IF SO: Do I need to add a resistor?

Q: Do TTL relay boards consume current from the arduino as do the LED's?

     IF SO:   How do I determine the amount of current required by each relay?

     AND:    How do I find the maximum available current for (Each Pin) and (Entire Board)

I would like to run 6 of those 8 channel boards with my arduino and would like status LED's


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