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31  Forum 2005-2010 (read only) / Interfacing / Re: Hardware SPI and TLC5940? on: March 02, 2008, 04:02:11 pm
go to this site:
https://whatever.metalab.at/user/wizard23/tlc5940/arduino/TLC5940/

and download and install the library for the TLC5940

it was written by someone at MIT.... and it works with the diecimila
32  Forum 2005-2010 (read only) / Interfacing / Re: Hardware SPI and TLC5940? on: March 02, 2008, 02:43:52 am
supply the TLC5940 chip with 3.3v from the decimilia

this will set the maximum current on each pin to something like 60 mA and the chip wont overheat
33  Forum 2005-2010 (read only) / Interfacing / Re: External Power supply for 15 TLC5940 for LEDs on: October 20, 2008, 10:28:57 am
you should power the chip from arduino (either 3.3v or 5v depending on your resistor for IREF).

what i meant to say in my post is that i have an external power supply for the LED's (not the TLC5940).... and a common ground between all three (the ground of the power supply is connected to ground on arduino and the TLC5940).

34  Forum 2005-2010 (read only) / Interfacing / Re: External Power supply for 15 TLC5940 for LEDs on: October 20, 2008, 08:42:13 am
i have an external power supply for the TLC5940 (3V @ 1 amp) and a common ground between the chip and arduino.

It should work for u too
35  Forum 2005-2010 (read only) / Interfacing / Re: IR Remotes and Arduino on: February 24, 2008, 07:44:02 pm
the code for both IR receiver and transmitter is here:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1176098434/8#8

all you have to do is make the circuit
36  Forum 2005-2010 (read only) / Interfacing / Re: SPI-Tutorial vs. shiftOut need some clarificat on: June 07, 2007, 03:40:13 pm
hey: can you post your source-code? i've tried defining my own SPI pins using shift-out but didnt manage to get it working

thx
37  Forum 2005-2010 (read only) / Interfacing / Re: Bluetooth support for multiple serial connecti on: May 08, 2007, 01:03:13 am
we had two bluetooth arduino's connected to one computer..... both were controlled in max|msp, i suspect you can pair and connect with more (we only have two)

so it is possible
-n
38  Forum 2005-2010 (read only) / Interfacing / Re: Strange LED Sensor like behavior  (Video on: November 27, 2006, 03:15:52 am
also: do you have the 1uf capicator shown in the schematic in your circuit? this will reduce noise from the circuit; maybe the capicitance or magnetic field of your body is affecting the circuit...????
39  Forum 2005-2010 (read only) / Interfacing / Re: Parallax RFID on: November 28, 2006, 11:49:58 pm
here is a semi-working code for reading from RFID.  There is a conflict when you read serial input from a chip while sending serial information back to the computer, this code was made last year.

char serInString[10];
int a = 1;

// function to read serial info and place in array
void readSerialString (char *strArray) {
  int i = 0;                  
  if(serialAvailable()) {            
    while (serialAvailable()){      
      strArray = serialRead();      
      i++;                  
    }                        
  }      
}

void setup () {
  beginSerial (2400);
  pinMode (0, INPUT);
  pinMode (7, OUTPUT);
  pinMode (13, OUTPUT);

}

void loop () {
  digitalWrite (7, HIGH);

  while (serialRead () != -1) {
    readSerialString(serInString);
    for (a=1; a<8; a++) {
      printInteger (a);
      printString (" :   ");
      printByte (serInString[a]);
    
      printByte (10);
      printByte (13);
      delay (50);
    }
    serialRead ();
  }
}

40  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: one general question concerning RFID readers.. on: April 08, 2006, 10:51:43 pm
Hi:

Using RFID in arduino is tricky because you will recieve a serial stream of 12 bits.   The way I got around this was to read the bits from the RFID and store it in a string array.

Each tag does have a unique ID and u can store the bits of the serial stream as characters.  So 'F' for 16 will be stored as the letter F.

-n
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