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LTP14188A-01 B56 wiring help

lokifalcon

New Member
Led Block with 64 led's. I think it is bi-color red/green. 12 pins on one side of bottom and 12 on other side. Does anyone know how to wire these up ??? Thanks Nathan
 

lokifalcon

New Member
No data sheet

I recieved these blocks from a person giving away some of his unused electrical stuff. He gave me a box with some neat stuff and some really bad stuff. But no data sheet was included. I think I researched and found it should be a bi-color led but I have found no other data. Especialy wiring.
Thanks
 

premkumar9

Member
I recieved these blocks from a person giving away some of his unused electrical stuff. He gave me a box with some neat stuff and some really bad stuff. But no data sheet was included. I think I researched and found it should be a bi-color led but I have found no other data. Especialy wiring.
Thanks
If you can the data sheet either directly from net OR with the help of somebody else, then I may be able to help on how to use this device.
 

lokifalcon

New Member
some info no data sheet

I havn't found a data sheet yet, I found this I don't know if it can help you. I did not understand all of it. I will continue to look for data sheet but does not look promising.
Thanks



There are multiple ways.... (as usual)


There are these chips from Maxim called MAX7219 that can drive up to 8x8 leds matrices. They are very simple to wire up, you just need a resistor and a capacitor. in the arduino distribution there should be some code called MAX7219 (written by Nick Zambetti) that shows how to send data to these guys.

you can find a schematic here in the datasheet http://www.electro-tech-online.com/custompdfs/2008/12/MAX7219-MAX7221.pdf

this can drive even fairly bright LEDs.

I'll attach the code here.

Code:
// define arduino pins

byte pin_max7219_dataIn = 2;
byte pin_max7219_clock = 3;
byte pin_max7219_load = 4;


// specify wiring pin i/o directions
void setPinModes()
{
pinMode(pin_max7219_dataIn, OUTPUT);
pinMode(pin_max7219_clock, OUTPUT);
pinMode(pin_max7219_load, OUTPUT);
}

// define max7219 registers
byte max7219_reg_noop = 0x00;
byte max7219_reg_digit0 = 0x01;
byte max7219_reg_digit1 = 0x02;
byte max7219_reg_digit2 = 0x03;
byte max7219_reg_digit3 = 0x04;
byte max7219_reg_digit4 = 0x05;
byte max7219_reg_digit5 = 0x06;
byte max7219_reg_digit6 = 0x07;
byte max7219_reg_digit7 = 0x08;
byte max7219_reg_decodeMode = 0x09;
byte max7219_reg_intensity = 0x0a;
byte max7219_reg_scanLimit = 0x0b;
byte max7219_reg_shutdown = 0x0c;
byte max7219_reg_displayTest = 0x0f;

// define max7219 as rows and cols (for nexus 8x8 displays)
byte max7219_row0 = 0x01;
byte max7219_row1 = 0x02;
byte max7219_row2 = 0x03;
byte max7219_row3 = 0x04;
byte max7219_row4 = 0x05;
byte max7219_row5 = 0x06;
byte max7219_row6 = 0x07;
byte max7219_row7 = 0x08;
byte max7219_col0 = 0x01;
byte max7219_col1 = 0x02;
byte max7219_col2 = 0x04;
byte max7219_col3 = 0x08;
byte max7219_col4 = 0x10;
byte max7219_col5 = 0x20;
byte max7219_col6 = 0x40;
byte max7219_col7 = 0x80;

// function to control max7219 data line
void max7219_setData(boolean value)
{
digitalWrite(pin_max7219_dataIn, value);
}

// function to control max7219 clock line
void max7219_setClock(boolean value)
{
digitalWrite(pin_max7219_clock, value);
}

// function to control max7219 load line
void max7219_setLoad(boolean value)
{
digitalWrite(pin_max7219_load, value);
}

// function that puts a byte of data to the max7219
void max7219_putByte(byte data)
{
byte i = 8;
byte mask;
while(i > 0) {
mask = 0x01 << (i - 1); // get bitmask
max7219_setClock(LOW); // tick
if (data & mask){ // choose bit
max7219_setData(HIGH); // send 1
}
else{
max7219_setData(LOW); // send 0
}
max7219_setClock(HIGH); // tock
--i; // move to lesser bit
}
}

// function that puts a byte of data into a max7219 register
void max7219_put(byte reg, byte data)
{
max7219_setLoad(LOW); // begin
max7219_putByte(reg); // specify register
max7219_putByte(data); // put data
max7219_setLoad(LOW); // latch in data
max7219_setLoad(HIGH); // end
max7219_setClock(LOW); // tick
}

// function that sets brightness of the max7219
void max7219_setIntensity(byte intensity)
{
// range: 0x00 to 0x0f
max7219_put(max7219_reg_intensity, intensity & 0x0f);
}

// function that sets the same value for all registers of the max7219
void max7219_all(byte value){
max7219_put(0x01, value);
max7219_put(0x02, value);
max7219_put(0x03, value);
max7219_put(0x04, value);
max7219_put(0x05, value);
max7219_put(0x06, value);
max7219_put(0x07, value);
max7219_put(0x08, value);
}

// function that initializes the max7219 to use a matrix of leds
void max7219_init()
{
max7219_put(max7219_reg_scanLimit, 0x04); // use 5 columns
max7219_put(max7219_reg_decodeMode, 0x00); // using an led matrix (not digits)
max7219_put(max7219_reg_shutdown, 0x01); // not in shutdown mode
max7219_put(max7219_reg_displayTest, 0x00); // no display test
max7219_all(0x00); // empty registers
max7219_setIntensity(0x08); // set initial brightness to dim
}

// program initialization routine
void setup()
{
beginSerial(9600);
setPinModes();
max7219_init();

}

// program loop
void loop()
{
//printString("blank\n");
max7219_all(0x00);
delay(500);
// draw diagonal line
//printString("diagonal");
max7219_put(max7219_row0, 0x0f);
max7219_put(max7219_row1, 0x0e);
max7219_put(max7219_row2, 0x08);
max7219_put(max7219_row3, 0x03);
max7219_put(max7219_row4, 0x1e);
max7219_put(max7219_row5, 0x0e);
max7219_put(max7219_row6, 0x0e);
max7219_put(max7219_row7, 0x0e);
delay(500);
}
 

premkumar9

Member
I havn't found a data sheet yet, I found this I don't know if it can help you. I did not understand all of it. I will continue to look for data sheet but does not look promising.
Thanks



There are multiple ways.... (as usual)


There are these chips from Maxim called MAX7219 that can drive up to 8x8 leds matrices. They are very simple to wire up, you just need a resistor and a capacitor. in the arduino distribution there should be some code called MAX7219 (written by Nick Zambetti) that shows how to send data to these guys.

you can find a schematic here in the datasheet http://www.electro-tech-online.com/custompdfs/2008/12/MAX7219-MAX7221-1.pdf

this can drive even fairly bright LEDs.

I'll attach the code here.
You are saying that MAX7221 can be used to drive this display unit. Still I think you need to have the data sheet of the display unit to decide the connection between this display unit and MAX7221. Also a micro controller may be required to give the signal to MAX7221. This is what I felt.
 

lokifalcon

New Member
8 pin version everywhere

I keep finding information on internet aobut a version that has eight pins instead of 12. Thanks for the info. There are some neat ideas using these leds on youtube.com. But it is only video no schematic or datasheet.
thanks Nathan
 

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