Cytron Technical Forum

hi can u help me.I faced a problem here....i make one project about sms walkie-talkie......i want make hardware using keypad, LCD and arduino nano for send message.......keypad can type message and send to LCD........can u help me design of LCD,KEYPAD and arduino nano v3.0 and coding......... my LCD doesn't display anything on screen and keypad (keypad 3x4 matrix 12-KEY Membrane Switch Keypad AVR 51)not function......I attached my coding, hope anyone can advice and help me.


#include <LiquidCrystal.h>
#include <Keypad.h>
const byte ROWS = 4; //Four rows//
const byte COLS = 3; //Three columns//
char keys[ROWS][COLS] =
{
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'#','0','*'}
};
// Define the Keymap//
byte rowPins[ROWS] = { 13, 10, 9, 8 };// Connect keypad ROW1, ROW2, ROW3 and ROW4 to these Arduino pins//
byte colPins[COLS] = { 7, 6, A5 }; // Connect keypad COL1, COL2 and COL3 to these Arduino pins//
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );//end of creating the Keypad//
LiquidCrystal lcd(12, NULL, 11, 5, 4, 3, 2); //create the lcd variable

void setup() {
lcd.clear(); //clear the LCD during setup
lcd.begin(8,2); //define the columns (8) and rows (2)
}

void loop() {
char key = keypad.getKey();
lcd.clear();
delay(1000);
if (key != NO_KEY)
{
lcd.clear();
lcd.home();
lcd.print("A");
delay(1000);

}
lcd.clear();
lcd.home();
lcd.print("ABC");
delay(1000);
lcd.clear(); //clear LCD, since we are still on 2nd line...
lcd.home(); //set the cursor the top left
}

hmm..

better u debug one by one.
may start with connnection lcd and display someting successfuly 1st.

the lcd is 4bit mode or 8bit mode connected?


regards,
yh

Try coding for LCD only before add another coding. Maybe hardware wrong.

LCD can display when i use coding 'hello word" but after i use keypeypad not function.........this my circuit ......can u help me