Programming for Display Board using Arduino+keypad+Max7221+LCD

[imranahmed]

Please let me know that I am using Arduino Mega2560 with keypad + MAX7221 + LCD

And I want to cascade MAX7221 ICs so my question is that would I write these functions
lc.shutdown(0,false);
/* Set the brightness to a medium values */
lc.setIntensity(0,8);
/* and clear the display */
lc.clearDisplay(0)

in setup or other pre-defined functions.

 

[srizbf]

if your code given is executed only once , then in 1''setup".

 

[imranahmed]

Here is my code,for keypad,I want to write any number and press # as enter but in
my program when I pressed # then # also print in LCD I do not want to print #.

#include <LiquidCrystal.h>
#include <Keypad.h>

byte inc=0;
const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char store[20];
char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
};
byte rowPins[ROWS] = {25, 24, 23, 22}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {28, 27, 26}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

LiquidCrystal lcd(35, 34, 33, 32, 31, 30);

void setup() {
    
  // set up the LCD's number of columns and rows:
  lcd.begin(20, 4); 
  
}

void loop()
{

  char key = keypad.getKey();  
  if(key != NO_KEY)
  {  
  store[inc] = key;
  inc++;      
  
  if(key == '#')
  lcd.print(store);
  inc=0;
  }   
}

 

[srizbf]

]

what is NO_KEY ?