Ok, let's try this again... I was going to have my other topic unlocked but i didn't want to get confused nor did i want anyone else to be as well.
i just received a pair of COMMON CATHODE 3 Digit Led's.. I have tested them both and unfortunately one is defective and i'm waiting for the replacement.
Here is the pin layout - the X's are the COMMON CATHODES:
X A F X X B
E D DP C G
They are connected to their corresponding segments on a MAX7219, the only one that is NOT connected is the DP simply because i have no use for it at all.
Here is the code i have that was given to me in the other topic, unfortunately it does NOT work, all it displays is 888
#include <SPI.h>
// set up names for the 14 MAX7219 registers:
const byte MAX7219_REG_NOOP = 0x00;
// codes 1 to 8 are digit positions 1 to 8, see below
const byte MAX7219_REG_DECODEMODE = 0x09;
const byte MAX7219_REG_INTENSITY = 0x0A;
const byte MAX7219_REG_SCANLIMIT = 0x0B;
const byte MAX7219_REG_SHUTDOWN = 0x0C;
// registers 0x0D and 0x0E are not used
const byte MAX7219_REG_DISPLAYTEST = 0x0F;
// you have 3 digits, so
const byte MAX7219_DIG0 = 0x01;
const byte MAX7219_DIG1 = 0x02;
const byte MAX7219_DIG2 = 0x03;
// 0x00,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F are same as 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
// and 3 variables to hold data - you will change these later to have different things displayed
byte digit0 = 3;
byte digit1 = 6;
byte digit2 = 9;
byte latchPin = 10; // or whatever pin you used
// 13 SCK will connect to MAX7219 clock
// 11 MOSI will connect to MAX7219 serial data in
// now put some data in the MAX7219 registers, and setup the latchPin - backing off from the function calls
void setup ()
{
Serial.begin(9600); // setup serial communications for debugging
pinMode (latchPin, OUTPUT);
digitalWrite (latchPin, HIGH);
// turn on SPI library - sets up the internal hardware for SCK, MISO, MOSI
SPI.begin (); // transfers to the MAX7219 will use default speed of 4 MHz
// now setup the 5 registers that control things
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_REG_SCANLIMIT); // send address
SPI.transfer (2); // send data to show 3 digits
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the other registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_REG_DECODEMODE); // send address
SPI.transfer (0xFF); // use internal mapping to create the digits
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the other registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_REG_DISPLAYTEST); // send address
SPI.transfer (0); // no display test (display test on turns on all segments)
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the other registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_REG_INTENSITY); // send address
SPI.transfer (7); // mid level intensity, 0 to 15
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the other registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_REG_SHUTDOWN); // send address
SPI.transfer (1); // 1 = not shutdown mode
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
// MAX7219 control registers all set, send some data!
Serial.println ("MAX7219 Setup done");
//continue for the data registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_DIG0); // send address
SPI.transfer (digit0); // data
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the data registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_DIG1); // send address
SPI.transfer (digit1); // 1 = not shutdown mode
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
//continue for the other registers
digitalWrite (latchPin, LOW);
SPI.transfer (MAX7219_DIG2); // send address
SPI.transfer (digit2); // 1 = not shutdown mode
digitalWrite (latchPin, HIGH); // data latched on this signal going Low to High
Serial.println ("End of Setup");
} // end of setup
void loop(){
}
What i want to accomplish is: to control a 10x10 LED MATRIX
These buttons control the 3 Digit Led, but each button will have 2 jobs..
Button 1: A/1
Button 2: B/2
Button 3: C/3
Button 4: D/4
Button 5: E/5
Button 6: F/6
Button 7: G/7
Button 8: H/8
Button 9: I/9
Button 10: J/10
So, if i wanted to display "e08" i would press button 5 and then button 8. Also i assume i would have to multiplex the buttons somehow with another chip?
We'll get to the following soon:
Button 11: Clear
Button 12: Enter
Button 13: Fleet
