Ayuda, alguien sabe cómo debo de conectar el transistor BC548 del siguiente esquema. Recién empiezo en esto ayuda.
Hice unas pruebas en proteus, pero en vez que los leds se enciendan de acuerdo con las letras, se apagan. Subiré el proyecto en proteus.
En las matrices, busque "cátodo común" (common cathode) y conéctelo a tierra, o "ánodo común" (common anode) y conéctelo a VCC.
Sin ver el código no sabemos que envías en columnas y filas.
Lee las normas y postea siempre toda la información.
Usa etiquetas para postear el código, si no sabes, lee las normas o mira cualquier hilo y verás que se le pide lo mismo a todos.
Si las columnas accionan el ánodo de los LEDs entonces las filas deben ser el cátodo o mas negativo.
Si pones un BC548 puede ir en cada linea al colector del mismo y el emisor a GND.
La base a una R de 470 ohms y al 595 de filas
Para accionarlo le pones un 1 y eso deja circular la corriente
Este es el código.
int clockPin = 2; //BLUE
int latchPin = 3; //GREEN
int dataPin = 4; //Yellow
int clockPinx = 5; //BLUE
int latchPinx = 6; //GREEN
int dataPinx = 7; //ORANGE
/*////////////////////////////////////////////////////////////////////////////////
* Arduino code to display scrolling characters on 6 or more 8x8 LED matrix. *
* The no: of matrices can be increased with a small change in code. *
* Circuit designed and program coded by PALLAB SARKAR *
* Instagram : _its_015
* Facebook : Pallab Sarkar
/*////////////////////////////////////////////////////////////////////////////////
char msg[] ="/ HELLO / ";//Change the text here.
int scrollspeed=15;//Set the scroll speed ( lower=faster)
int x;
int y;
//Columns
int clockPin1 = 2; //Arduino pin connected to Clock Pin 11 of 74HC595
int latchPin1 = 3; //Arduino pin connected to Latch Pin 12 of 74HC595
int dataPin1 = 4; //Arduino pin connected to Data Pin 14 of 74HC595
//Rows
int clockPin2 = 5; //Arduino pin connected to Clock Pin 11 of 74HC595
int latchPin2 = 6; //Arduino pin connected to Latch Pin 12 of 74HC595
int dataPin2 = 7; //Arduino pin connected to Data Pin 14 of 74HC595
//BITMAP
//Bits in this array represents one LED of the matrix
// 8 is # of rows, 6 is # of LED matrices
byte bitmap[8][4];
int numZones = sizeof(bitmap) / 8; // One Zone refers to one 8 x 8 Matrix ( Group of 8 columns)
int maxZoneIndex = numZones-1;
int numCols = numZones * 8;
//FONT DEFENITION
byte alphabets[][8] = {
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, /*space*/
{0x2a,0x1c,0x3e,0x1c,0x2a,0x00,0x00,0x00}, /***/
{0x08,0x08,0x3e,0x08,0x08,0x00,0x00,0x00}, /*+*/
{0x00,0x0d,0x0e,0x00,0x00,0x00,0x00,0x00}, /*,*/
{0x08,0x08,0x08,0x08,0x08,0x00,0x00,0x00}, /*-*/
{0x00,0x06,0x06,0x00,0x00,0x00,0x00,0x00}, /*.*/
{0x03,0x04,0x08,0x10,0x60,0x00,0x00,0x00}, /*/*/
{0x3e,0x45,0x49,0x51,0x3e,0x00,0x00,0x00}, /*0*/
{0x00,0x21,0x7f,0x01,0x00,0x00,0x00,0x00}, /*1*/
{0x31,0x43,0x45,0x49,0x31,0x00,0x00,0x00}, /*2*/
{0x22,0x41,0x49,0x49,0x36,0x00,0x00,0x00}, /*3*/
{0x08,0x18,0x28,0x7f,0x08,0x00,0x00,0x00}, /*4*/
{0x72,0x51,0x51,0x51,0x4e,0x00,0x00,0x00}, /*5*/
{0x3e,0x49,0x49,0x49,0x26,0x00,0x00,0x00}, /*6*/
{0x60,0x40,0x47,0x48,0x70,0x00,0x00,0x00}, /*7*/
{0x36,0x49,0x49,0x49,0x36,0x00,0x00,0x00}, /*8*/
{0x32,0x49,0x49,0x49,0x3e,0x00,0x00,0x00}, /*9*/
{0x00,0x63,0x63,0x00,0x00,0x00,0x00,0x00}, /*:*/
{0x00,0x6d,0x6e,0x00,0x00,0x00,0x00,0x00}, /*;*/
{0x08,0x14,0x22,0x00,0x00,0x00,0x00,0x00}, /*<*/
{0x14,0x14,0x14,0x14,0x14,0x00,0x00,0x00}, /*=*/
{0x00,0x22,0x14,0x08,0x00,0x00,0x00,0x00}, /*>*/
{0x60,0x80,0x8d,0x90,0x60,0x00,0x00,0x00}, /*?*/
{0x3e,0x41,0x5d,0x5d,0x38,0x00,0x00,0x00}, /*@*/
{0x3f,0x48,0x48,0x48,0x3f,0x00,0x00,0x00}, /*A*/
{0x7f,0x49,0x49,0x49,0x36,0x00,0x00,0x00}, /*B*/
{0x3e,0x41,0x41,0x41,0x22,0x00,0x00,0x00}, /*C*/
{0x7f,0x41,0x41,0x41,0x3e,0x00,0x00,0x00}, /*D*/
{0x7f,0x49,0x49,0x49,0x41,0x00,0x00,0x00}, /*E*/
{0x7f,0x48,0x48,0x48,0x40,0x00,0x00,0x00}, /*F*/
{0x3e,0x41,0x41,0x45,0x26,0x00,0x00,0x00}, /*G*/
{0x7f,0x08,0x08,0x08,0x7f,0x00,0x00,0x00}, /*H*/
{0x41,0x41,0x7f,0x41,0x41,0x00,0x00,0x00}, /*I*/
{0x46,0x41,0x41,0x41,0x7e,0x00,0x00,0x00}, /*J*/
{0x7f,0x08,0x14,0x22,0x41,0x00,0x00,0x00}, /*K*/
{0x7f,0x01,0x01,0x01,0x01,0x00,0x00,0x00}, /*L*/
{0x7f,0x20,0x18,0x20,0x7f,0x00,0x00,0x00}, /*M*/
{0x7f,0x10,0x08,0x04,0x7f,0x00,0x00,0x00}, /*N*/
{0x3e,0x41,0x41,0x41,0x3e,0x00,0x00,0x00}, /*O*/
{0x7f,0x48,0x48,0x48,0x30,0x00,0x00,0x00}, /*P*/
{0x3e,0x41,0x45,0x43,0x3f,0x00,0x00,0x00}, /*Q*/
{0x7f,0x48,0x4c,0x4a,0x31,0x00,0x00,0x00}, /*R*/
{0x32,0x49,0x49,0x49,0x26,0x00,0x00,0x00}, /*S*/
{0x60,0x40,0x7f,0x40,0x60,0x00,0x00,0x00}, /*T*/
{0x7e,0x01,0x01,0x01,0x7e,0x00,0x00,0x00}, /*U*/
{0x7c,0x02,0x01,0x02,0x7c,0x00,0x00,0x00}, /*V*/
{0x7e,0x01,0x0e,0x01,0x7e,0x00,0x00,0x00}, /*W*/
{0x63,0x14,0x08,0x14,0x63,0x00,0x00,0x00}, /*X*/
{0x60,0x10,0x0f,0x10,0x60,0x00,0x00,0x00}, /*Y*/
{0x43,0x45,0x49,0x51,0x61,0x00,0x00,0x00}, /*Z*/
{0x7f,0x41,0x00,0x00,0x00,0x00,0x00,0x00}, /*[*/
{0x3e,0x41,0x41,0x00,0x00,0x00,0x00,0x00}, /*<*/
{0x41,0x7f,0x00,0x00,0x00,0x00,0x00,0x00}, /*]*/
{0x08,0x10,0x20,0x10,0x08,0x00,0x00,0x00}, /*^*/
{0x02,0x02,0x02,0x02,0x02,0x00,0x00,0x00}, /*_*/
{0x00,0x00,0x70,0x78,0x08,0x00,0x00,0x00}, /*`*/
{0x02,0x15,0x15,0x15,0x0f,0x00,0x00,0x00}, /*a*/
{0x7f,0x09,0x11,0x11,0x0e,0x00,0x00,0x00}, /*b*/
{0x0e,0x11,0x11,0x11,0x00,0x00,0x00,0x00}, /*c*/
{0x0e,0x11,0x11,0x09,0x7e,0x00,0x00,0x00}, /*d*/
{0x0e,0x15,0x15,0x15,0x0c,0x00,0x00,0x00}, /*e*/
{0x08,0x3f,0x48,0x40,0x20,0x00,0x00,0x00}, /*f*/
{0x18,0x25,0x25,0x25,0x1e,0x00,0x00,0x00}, /*g*/
{0x7f,0x08,0x10,0x10,0x0f,0x00,0x00,0x00}, /*h*/
{0x00,0x05,0x2f,0x01,0x00,0x00,0x00,0x00}, /*i*/
{0x02,0x09,0x2f,0x08,0x00,0x00,0x00,0x00}, /*j*/
{0x7f,0x04,0x0a,0x11,0x00,0x00,0x00,0x00}, /*k*/
{0x00,0x41,0x7f,0x01,0x00,0x00,0x00,0x00}, /*l*/
{0x1f,0x10,0x08,0x10,0x0f,0x00,0x00,0x00}, /*m*/
{0x1f,0x10,0x10,0x10,0x0f,0x00,0x00,0x00}, /*n*/
{0x0e,0x11,0x11,0x11,0x0e,0x00,0x00,0x00}, /*o*/
{0x1f,0x14,0x14,0x14,0x08,0x00,0x00,0x00}, /*p*/
{0x08,0x14,0x14,0x1f,0x01,0x00,0x00,0x00}, /*q*/
{0x1f,0x08,0x10,0x10,0x08,0x00,0x00,0x00}, /*r*/
{0x09,0x15,0x15,0x15,0x12,0x00,0x00,0x00}, /*s*/
{0x08,0x3e,0x09,0x01,0x02,0x00,0x00,0x00}, /*t*/
{0x1e,0x01,0x01,0x01,0x1f,0x00,0x00,0x00}, /*u*/
{0x1c,0x02,0x01,0x02,0x1c,0x00,0x00,0x00}, /*v*/
{0x1f,0x02,0x0c,0x02,0x1f,0x00,0x00,0x00}, /*w*/
{0x11,0x0a,0x04,0x0a,0x11,0x00,0x00,0x00}, /*x*/
{0x18,0x05,0x05,0x05,0x1e,0x00,0x00,0x00}, /*y*/
{0x11,0x13,0x15,0x19,0x00,0x00,0x00,0x00}, /*z*/
{0x08,0x36,0x41,0x41,0x00,0x00,0x00,0x00}, /*{*/
{0x00,0x00,0x7f,0x00,0x00,0x00,0x00,0x00}, /*|*/
{0x00,0x41,0x41,0x36,0x08,0x00,0x00,0x00}, /*}*/
{0x08,0x10,0x08,0x04,0x08,0x00,0x00,0x00}, /*~*/
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
};
void setup() {
pinMode(latchPin1, OUTPUT);
pinMode(clockPin1, OUTPUT);
pinMode(dataPin1, OUTPUT);
pinMode(latchPin2, OUTPUT);
pinMode(clockPin2, OUTPUT);
pinMode(dataPin2, OUTPUT);
//Clear bitmap
for (int row = 0; row < 8; row++) {
for (int zone = 0; zone <= maxZoneIndex; zone++) {
bitmap[row][zone] = 0;
}
}
}
//FUNCTIONS
// Displays bitmap array in the matrix
void RefreshDisplay()
{
for (int row = 0; row < 8; row++) {
int rowbit = 1 << row;
digitalWrite(latchPin2, LOW);//Hold latchPin LOW for transmitting data
shiftOut(dataPin2, clockPin2, MSBFIRST, rowbit); //Transmit data
//Start sending column bytes
digitalWrite(latchPin1, LOW);//Hold latchPin LOW for transmitting data
//Shift out to each matrix
for (int zone = maxZoneIndex; zone >= 0; zone--)
{
shiftOut(dataPin1, clockPin1, MSBFIRST, bitmap[row][zone]);
}
//flip both latches at once to eliminate flicker
digitalWrite(latchPin1, HIGH);//Return the latch pin 1 high to signal chip
digitalWrite(latchPin2, HIGH);//Return the latch pin 2 high to signal chip
//Wait
delayMicroseconds(100);
}
}
// Converts row and colum to bitmap bit and turn it off/on
void Plot(int col, int row, bool isOn)
{
int zone = col / 8;
int colBitIndex = x % 8;
byte colBit = 1 << colBitIndex;
if (isOn)
bitmap[row][zone] = bitmap[y][zone] | colBit;
else
bitmap[row][zone] = bitmap[y][zone] & (~colBit);
}
// Plot each character of the message one column at a time, updated the display, shift bitmap left.
void XProcess()
{
for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)
{
int alphabetIndex = msg[charIndex] -')';
if (alphabetIndex < 0) alphabetIndex=0;
//Draw one character of the message
// Each character is 5 columns wide, loop two more times to create 2 pixel space betwen characters
for (int col = 0; col < 6; col++)
{
for (int row = 0; row < 8; row++)
{
// Set the pixel to what the alphabet say for columns 0 thru 4, but always leave columns 5 and 6 blank.
bool isOn = 0;
if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;
Plot( numCols-1, row, isOn); //Draw on the rightmost column, the shift loop below will scroll it leftward.
}
for (int refreshCount=0; refreshCount < scrollspeed; refreshCount++)
RefreshDisplay();
//Shift the bitmap one column to left
for (int row=0; row<8; row++)
{
for (int zone=0; zone < numZones; zone++)
{
//This right shift would show as a left scroll on display because leftmost column is represented by least significant bit of the byte.
bitmap[row][zone] = bitmap[row][zone] >> 1;
// Shift over lowest bit from the next zone as highest bit of this zone.
if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 7, bitRead(bitmap[row][zone+1],0));
}
}
}
}
}
void loop() {
XProcess();
}
Creo que la configuración es esta:
Pero me parece mas práctico usar un ULN2803 que un conjunto de 8 transistores y 8 resistencias.
Solo para que lo consideres, tienes los módulos MAX7219 que ya vienen con todo integrado y los puedes armar de la longitud que desees.
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