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1111  Using Arduino / LEDs and Multiplexing / Re: What to buy? on: August 06, 2013, 05:51:57 am
Besides the WS2803 and TLC5940 mentioned by Fungus and Riva  a MAX7219 or MAX7221-chip  could also be used to PWM 16 leds.
Alas the MAX7219/MAX7221 only has 16 levels of dimming and it effects all ports equally at the same time.
1112  Development / Other Software Development / Re: Notepad++ User Defined Language for Arduino on: August 06, 2013, 03:00:29 am
This is just excellent.
It suits most of my needs, especially now I have bothered to add Arduino IDE call to the 'Run' menu. Main bugbear is the insistence of putting the sketch into it's own like named folder so to save I need to create the folder then the sketch within it. I would also like to try Arduino-Builder but it's interface does not work on my main PC for some reason.
1113  Using Arduino / Storage / Re: AVR with SD as mass storage device? on: August 06, 2013, 02:06:16 am
Is it possibly to have an AVR like the 32U4 coupled with a micro SD card, to show up on a computer as a mass storage device, so you could just copy files back and forth?
That's something I was looking at some time ago and found this link useful ( but hit a wall trying to massage the LUFA libraries and the code to arduino land.
1114  Community / Website and Forum / Re: Unexpected screen when trying to access a thread on: August 06, 2013, 12:56:35 am
1115  Using Arduino / General Electronics / Re: Mounting leds on: August 05, 2013, 08:33:56 am
Another cheap option is to use something like silicon sealant (like you put round the bath) but the cure times can make the job easier/harder depending if you need the items ASAP or a few hours later.
1116  Using Arduino / Audio / Re: Storing data in an audio channel on: August 05, 2013, 08:29:38 am
As Crossroads shows Nyquist theorem basically says you need to sample 2x faster than your required sample rate. So turning it on it's head if you have 3KHz signal then expect to store no more than 1.5KHz data rate. You also need to take into account the encoding method you use as methods like SMPTE and Manchester will half that value again. For SMPTE a 1 bit is twice the frequency of a 0 bit.
1117  Using Arduino / General Electronics / Re: Mounting leds on: August 05, 2013, 07:16:22 am
If the panel material is not see-through then could you use a hot glue gun to fix the LED's from the back?
1118  Community / Website and Forum / Re: Unexpected screen when trying to access a thread on: August 05, 2013, 04:07:54 am
I have a theory but cannot test it myself.
If you create a new topic and list it in the unread posts (but don't go to it) and then move/delete the topic using a different browser tab/window. Flip back to the unread posts tab/window and then try going to the topic, does it throw up this message?
1119  Community / Website and Forum / Re: Unexpected screen when trying to access a thread on: August 05, 2013, 01:55:33 am
I have spent some time investigating this nginx thing and most the stuff I came across points to it being a tool used by web sites for various reasons like file handling, reverse proxy & load balancing. Could you please tell tell me if the Arduino site(s) use this tool.
1120  Using Arduino / LEDs and Multiplexing / Re: High Power Led on: August 02, 2013, 11:59:44 am
Maybe build your own
1121  Community / Website and Forum / Unexpected screen when trying to access a thread on: August 02, 2013, 11:49:10 am
Was trying to access this and ended up with this...
1122  Using Arduino / Project Guidance / Re: Arducam: How to save a frame in a variable on: August 02, 2013, 11:35:10 am
I don't think the arduino's have enough RAM to hold a variable the size you need.
1123  Using Arduino / LEDs and Multiplexing / Re: Help in Scrolling LEDs on: August 02, 2013, 05:38:10 am
It's not tested with LED's and it is not elegant but something like this...
const byte ledPins[] = {2,3,4,5,6,7,8,9};   // List of pins the LED's are connected to

void setup(){
  for (byte x = 0; x < sizeof(ledPins); x++){

void loop() {
  byte x,y;
  for (x = 0; x < sizeof(ledPins); x++){
    for (y = sizeof(ledPins); y > x; y--){
      Serial.print(" ");
  while (1){};
The problem with trying to convert the Z80 code is the UNO only has one 8 bit port but it includes pin 0 & 1 so if you want to use serial then this rules out direct port manipulation of D
1124  Using Arduino / General Electronics / Re: RS232 led sign on: August 02, 2013, 03:52:23 am
Assuming your using the RJ12 to D-SUB9 connector cable your currently using to connect to the PC then you will need to use either some form of Software Serial or a separate serial port (Mega) if your Arduino is connected to the PC at the same time. Your RS232 converter has 4 pins that need connecting to the arduinos 5V, GND and the relevant RX/TX pins. The protocol looks to be 9600,E,7,1 so this may rule out the use of standard SoftwareSerial library. Both links you supply seem to give comprehensive info on the protocol.
The eBay listing states
Notice:The chip max3232 is made in China,some customer find it not compatible after purchase.

So please make sure the chip is compatible with your own system before purchase.Thanks for your cooperation!
Chicken and egg situation here.  smiley-confuse
1125  Using Arduino / Project Guidance / Re: Which is the best board for me to use? on: August 01, 2013, 10:37:25 am
A mega has 16 analogue pins and you can pick up a clone SainSmart Mega R3 for £11 (about $17)

Wow, that's much cheaper than I though it would be. Seems perfect for the job too. Thanks for the help.
The link I was referring to
I have had one for several weeks now and it works without problems and I have just ordered another for a DMX tester project for work.
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