LCD Won't display text

treasuremaker12 · March 3, 2021, 3:44am

Hi, so I'm creating this project called digital code lock and I'm using 4x4 Keypad, LCD,
a micro Servo motor, and a piezo
but the only thing that is not working is the display of the LCD.
I don't know what is the problem
it is either the connection or the code. I'm conducting this project on tinkercad.

I have this code below:

#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Servo.h>
Servo myservo;
int pos=0; // LCD Connections
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);
const byte rows=4;
const byte cols=3;
char key[rows][cols]={
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[rows]={1,2,3,4};
byte colPins[cols]={5,6,7};
Keypad keypad= Keypad(makeKeymap(key),rowPins,colPins,rows,cols);
char* password="5558";
int currentposition=0;
int redled=10;
int greenled=11;
int buzz=8;
int invalidcount=12;
void setup()
{
displayscreen();
Serial.begin(9600);
pinMode(redled, OUTPUT);
pinMode(greenled, OUTPUT);
pinMode(buzz, OUTPUT);
myservo.attach(9); //SERVO ATTACHED//
lcd.begin(16,2);
}
void loop()
{
if( currentposition==0)
{
displayscreen();
}
int l ;
char code=keypad.getKey();
if(code!=NO_KEY)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("PASSWORD:");
lcd.setCursor(7,1);
lcd.print(" ");
lcd.setCursor(7,1);
for(l=0;l<=currentposition;++l)
{
lcd.print("*");
keypress();
}
if (code==password[currentposition])
{
++currentposition;
if(currentposition==4)
{
unlockdoor();
currentposition=0;
}
}
else
{
++invalidcount;
incorrect();
currentposition=0;
}
}
// LOOP ENDS!!!//
}
//*******************************************OPEN THE DOOR FUNCTION!!!!***********************************************//
void unlockdoor()
{
delay(900);
lcd.setCursor(0,0);
lcd.println(" ");
lcd.setCursor(1,0);
lcd.print("Access Granted");
lcd.setCursor(4,1);
lcd.println("WELCOME!!");
lcd.setCursor(15,1);
lcd.println(" ");
lcd.setCursor(16,1);
lcd.println(" ");
lcd.setCursor(14,1);
lcd.println(" ");
lcd.setCursor(13,1);
lcd.println(" ");
unlockbuzz();
for(pos = 180; pos>=0; pos-=5) // goes from 180 degrees to 0 degrees
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(5); // waits 15ms for the servo to reach the position
}
delay(2000);
delay(1000);
counterbeep();
delay(1000);
for(pos = 0; pos <= 180; pos +=5) // goes from 0 degrees to 180 degrees
{ // in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15);
currentposition=0;
lcd.clear();
displayscreen();
}
}
//**********************************WRONG CODE FUNCTION*************************************************//
void incorrect()
{
delay(500);
lcd.clear();
lcd.setCursor(1,0);
lcd.print("CODE");
lcd.setCursor(6,0);
lcd.print("INCORRECT");
lcd.setCursor(15,1);
lcd.println(" ");
lcd.setCursor(4,1);
lcd.println("GET AWAY!!!");
lcd.setCursor(13,1);
lcd.println(" ");
Serial.println("CODE INCORRECT YOU ARE UNAUTHORIZED");
digitalWrite(redled, HIGH);
digitalWrite(buzz, HIGH);
delay(3000);
lcd.clear();
digitalWrite(redled, LOW);
digitalWrite(buzz,LOW);
displayscreen();
}
//****************************** CLEAR THE SCREEN!!!**********************//
void clearscreen()
{
lcd.setCursor(0,0);
lcd.println(" ");
lcd.setCursor(0,1);
lcd.println(" ");
lcd.setCursor(0,2);
lcd.println(" ");
lcd.setCursor(0,3);
lcd.println(" ");
}
//******************************KEYPRESS***********************************//
void keypress()
{
digitalWrite(buzz, HIGH);
delay(50);
digitalWrite(buzz, LOW);
}
//********************************DISPALAY FUNCTION!!!***********************************************************//
void displayscreen()
{
lcd.setCursor(0,0);
lcd.println("*ENTER THE CODE*");
lcd.setCursor(1 ,1);
lcd.println("TO _/_ (OPEN)!!");
}
//*************************** ARM SERVO****************************************************************************//
void armservo()
{
for (pos=180;pos<=180;pos+=50)
{
myservo.write(pos);
delay(5);
}
delay(5000);
for(pos=180;pos>=0;pos-=50)
{
myservo.write(pos);
}
}
//********************************UNLOCK BUZZ***********************************//
void unlockbuzz()
{
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(200);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
}
//*******************************COUNTER BEEP*************************************//
void counterbeep()
{
delay(1200);
lcd.clear();
digitalWrite(buzz, HIGH);
lcd.setCursor(2,15);
lcd.println(" ");
lcd.setCursor(2,14);
lcd.println(" ");
lcd.setCursor(2,0);
delay(200);
lcd.println("GET IN WITHIN:::");
lcd.setCursor(4,1);
lcd.print("5");
delay(200);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//2
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //2
lcd.print("4");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//3
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //3
lcd.print("3");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//4
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //4
lcd.print("2");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//
digitalWrite(buzz, HIGH);
lcd.setCursor(4,1);
lcd.print("1");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN::");
digitalWrite(buzz,LOW);
delay(1000);
//5
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
lcd.clear();
lcd.setCursor(2,0);
lcd.print("RE-LOCKING");
delay(500);
lcd.setCursor(12,0);
lcd.print(".");
delay(500);
lcd.setCursor(13,0);
lcd.print(".");
delay(500);
lcd.setCursor(14,0);
lcd.print(".");
delay(400);
lcd.clear();
lcd.setCursor(4,0);
lcd.print("LOCKED!");
delay(440
);
}

And here is the connection:

groundFungus · March 3, 2021, 3:51am

Did the display work when tested by itself with the library example code?

What does "not working " mean? That conveys no useful information. Does the backlight work? Are there blocks displayed? Does adjusting the contrast make a difference?

The resistor on the backlight may not be necessary and if it is necessary, 1K is probably too high.
180 to 220 is more like it.

What is the value of the contrast resistor? I use iK or a pot wired to ground and LCD pin 3 (no connection to Vcc).

Your diagram is missing a wire for LCD pin D7.

Read the how get the most out of this forum sticky to see how to properly post code. Remove useless white space and format the code with the IDE autoformat tool (crtl-t or Tools, Auto Format) before posting code in code tags.

Does using pin 1 (hardware serial TX) have any effect on the functioning of the keypad?

treasuremaker12 · March 3, 2021, 4:44am

Hi, so I'm creating this project called digital code lock and
I'm using 4x4 Keypad, LCD,
a micro Servo motor, and a piezo
but the only thing that is not working is the display of the LCD.
The LCD isn't showing any text.
for the LCD I'm using 220 ohms
for the piezo I'm using 180 ohms
I don't know what is the problem
it is either the connection or the code.
I'm conducting this project on tinkercad.

I have this code below:

#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Servo.h>
Servo myservo;
int pos=0; // LCD Connections
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);
const byte rows=4;
const byte cols=3;
char key[rows][cols]={
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[rows]={1,2,3,4};
byte colPins[cols]={5,6,7};
Keypad keypad= Keypad(makeKeymap(key),rowPins,colPins,rows,cols);
char* password="5558";
int currentposition=0;
int redled=10;
int greenled=11;
int buzz=8;
int invalidcount=12;
void setup()
{
displayscreen();
Serial.begin(9600);
pinMode(redled, OUTPUT);
pinMode(greenled, OUTPUT);
pinMode(buzz, OUTPUT);
myservo.attach(9); //SERVO ATTACHED//
lcd.begin(16,2);
}
void loop()
{
if( currentposition==0)
{
displayscreen();
}
int l ;
char code=keypad.getKey();
if(code!=NO_KEY)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("PASSWORD:");
lcd.setCursor(7,1);
lcd.print(" ");
lcd.setCursor(7,1);
for(l=0;l<=currentposition;++l)
{
lcd.print("*");
keypress();
}
if (code==password[currentposition])
{
++currentposition;
if(currentposition==4)
{
unlockdoor();
currentposition=0;
}
}
else
{
++invalidcount;
incorrect();
currentposition=0;
}
}
// LOOP ENDS!!!//
}
//*******************************************OPEN THE DOOR FUNCTION!!!!***********************************************//
void unlockdoor()
{
delay(900);
lcd.setCursor(0,0);
lcd.println(" ");
lcd.setCursor(1,0);
lcd.print("Access Granted");
lcd.setCursor(4,1);
lcd.println("WELCOME!!");
lcd.setCursor(15,1);
lcd.println(" ");
lcd.setCursor(16,1);
lcd.println(" ");
lcd.setCursor(14,1);
lcd.println(" ");
lcd.setCursor(13,1);
lcd.println(" ");
unlockbuzz();
for(pos = 180; pos>=0; pos-=5) // goes from 180 degrees to 0 degrees
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(5); // waits 15ms for the servo to reach the position
}
delay(2000);
delay(1000);
counterbeep();
delay(1000);
for(pos = 0; pos <= 180; pos +=5) // goes from 0 degrees to 180 degrees
{ // in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15);
currentposition=0;
lcd.clear();
displayscreen();
}
}
//**********************************WRONG CODE FUNCTION*************************************************//
void incorrect()
{
delay(500);
lcd.clear();
lcd.setCursor(1,0);
lcd.print("CODE");
lcd.setCursor(6,0);
lcd.print("INCORRECT");
lcd.setCursor(15,1);
lcd.println(" ");
lcd.setCursor(4,1);
lcd.println("GET AWAY!!!");
lcd.setCursor(13,1);
lcd.println(" ");
Serial.println("CODE INCORRECT YOU ARE UNAUTHORIZED");
digitalWrite(redled, HIGH);
digitalWrite(buzz, HIGH);
delay(3000);
lcd.clear();
digitalWrite(redled, LOW);
digitalWrite(buzz,LOW);
displayscreen();
}
//****************************** CLEAR THE SCREEN!!!**********************//
void clearscreen()
{
lcd.setCursor(0,0);
lcd.println(" ");
lcd.setCursor(0,1);
lcd.println(" ");
lcd.setCursor(0,2);
lcd.println(" ");
lcd.setCursor(0,3);
lcd.println(" ");
}
//******************************KEYPRESS***********************************//
void keypress()
{
digitalWrite(buzz, HIGH);
delay(50);
digitalWrite(buzz, LOW);
}
//********************************DISPALAY FUNCTION!!!***********************************************************//
void displayscreen()
{
lcd.setCursor(0,0);
lcd.println("*ENTER THE CODE*");
lcd.setCursor(1 ,1);
lcd.println("TO _/_ (OPEN)!!");
}
//*************************** ARM SERVO****************************************************************************//
void armservo()
{
for (pos=180;pos<=180;pos+=50)
{
myservo.write(pos);
delay(5);
}
delay(5000);
for(pos=180;pos>=0;pos-=50)
{
myservo.write(pos);
}
}
//********************************UNLOCK BUZZ***********************************//
void unlockbuzz()
{
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(200);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
digitalWrite(buzz, HIGH);
delay(80);
digitalWrite(buzz, LOW);
delay(80);
}
//*******************************COUNTER BEEP*************************************//
void counterbeep()
{
delay(1200);
lcd.clear();
digitalWrite(buzz, HIGH);
lcd.setCursor(2,15);
lcd.println(" ");
lcd.setCursor(2,14);
lcd.println(" ");
lcd.setCursor(2,0);
delay(200);
lcd.println("GET IN WITHIN:::");
lcd.setCursor(4,1);
lcd.print("5");
delay(200);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//2
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //2
lcd.print("4");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//3
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //3
lcd.print("3");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//4
digitalWrite(buzz, HIGH);
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
lcd.setCursor(4,1); //4
lcd.print("2");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN:");
digitalWrite(buzz,LOW);
delay(1000);
//
digitalWrite(buzz, HIGH);
lcd.setCursor(4,1);
lcd.print("1");
delay(100);
lcd.clear();
lcd.setCursor(2,0);
lcd.println("GET IN WITHIN::");
digitalWrite(buzz,LOW);
delay(1000);
//5
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
delay(40);
digitalWrite(buzz, HIGH);
delay(40);
digitalWrite(buzz,LOW);
lcd.clear();
lcd.setCursor(2,0);
lcd.print("RE-LOCKING");
delay(500);
lcd.setCursor(12,0);
lcd.print(".");
delay(500);
lcd.setCursor(13,0);
lcd.print(".");
delay(500);
lcd.setCursor(14,0);
lcd.print(".");
delay(400);
lcd.clear();
lcd.setCursor(4,0);
lcd.print("LOCKED!");
delay(440
);
}

And here is the picture of the connection:

PerryBebbington · March 3, 2021, 10:08am

@treasuremaker12,
I've merged your 2 topics on the same subject. I realise you were trying to do the right thing by re-posting correctly but by posting twice you opened up the possibility of some people answering one and others answering the second one, wasting people's time and leading to confusion. You could and should have edited your first post to correct it.

Thanks.

system · July 1, 2021, 3:45am

This topic was automatically closed after 55 days. New replies are no longer allowed.

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LCD Won't display text

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