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Connected the ckt like this and got the LCD to display boxes and nothing else. What could be wrong here? Please help!

Ckt diagram below -

I have connected the circuit as per the diagram below and I have got the LCD to display boxes and nothing else. What could be wrong here? Please help!

Circuit diagram below -

#include<DHT11.h> 

#include<LiquidCrystal.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
#define dht11pin 12 
dht11 DHT11;
#define pwm 9
byte degree[8] = 
              {
                0b00011,
                0b00011,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000
              };
void setup()
{
 lcd.begin(16, 2);

 lcd.createChar(1, degree);

 lcd.clear();

 lcd.print("   Fan Speed  ");

 lcd.setCursor(0,1);

 lcd.print("  Controlling ");

 delay(2000);

 analogWrite(pwm, 255);

 lcd.clear();

 lcd.print("Our Project ");

 delay(2000);

}

void loop()
{
  DHT11.read(dht11pin);

  int temp=DHT11.temperature;

  lcd.setCursor(0,0);

  lcd.print("Temperature:");

  lcd.print(temp);

  lcd.write(1);

  lcd.print("C");

  lcd.setCursor(0,1);

  if(temp <26 )
    { 
      analogWrite(9,0);
      lcd.print("Fan OFF  ");
      delay(100);
    }
    
    else if(temp==26)
    {
      analogWrite(pwm, 51);
      lcd.print("Fan Speed: 20%   ");
      delay(100);
    }
    
     else if(temp==27)
    {
      analogWrite(pwm, 102);
      lcd.print("Fan Speed: 40%   ");
      delay(100);
    }
    
     else if(temp==28)
    {
      analogWrite(pwm, 153);
      lcd.print("Fan Speed: 60%   ");
      delay(100);
    }
    
    else if(temp==29)
    {
      analogWrite(pwm, 204);
      lcd.print("Fan Speed: 80%    ");
      delay(100);
    }
     else if(temp>29)
    {
      analogWrite(pwm, 255);
      lcd.print("Fan Speed: 100%   ");
      delay(100);
    } 
  delay(3000);
}

#include<DHT11.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
#define dht11pin 12
dht11 DHT11;
#define pwm 9
byte degree[8] =
{
  0b00011,
  0b00011,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000
};
void setup()
{
  lcd.begin(16, 2);
  lcd.createChar(1, degree);
  lcd.clear();
  lcd.print("   Fan Speed  ");
  lcd.setCursor(0, 1);
  lcd.print("  Controlling ");
  delay(2000);
  analogWrite(pwm, 255);
  lcd.clear();
  lcd.print("Our Project ");
  delay(2000);
}

void loop()
{
  DHT11.read(dht11pin);
  int temp = DHT11.temperature;
  lcd.setCursor(0, 0);
  lcd.print("Temperature:");
  lcd.print(temp);
  lcd.write(1);
  lcd.print("C");
  lcd.setCursor(0, 1);
  if (temp < 26 )
  {
    analogWrite(9, 0);
    lcd.print("Fan OFF  ");
    delay(100);
  }
  else if (temp == 26)
  {
    analogWrite(pwm, 51);
    lcd.print("Fan Speed: 20%   ");
    delay(100);
  }
  else if (temp == 27)
  {
    analogWrite(pwm, 102);
    lcd.print("Fan Speed: 40%   ");
    delay(100);
  }
  else if (temp == 28)
  {
    analogWrite(pwm, 153);
    lcd.print("Fan Speed: 60%   ");
    delay(100);
  }
  else if (temp == 29)
  {
    analogWrite(pwm, 204);
    lcd.print("Fan Speed: 80%    ");
    delay(100);
  }
  else if (temp > 29)
  {
    analogWrite(pwm, 255);
    lcd.print("Fan Speed: 100%   ");
    delay(100);
  }
  delay(3000);
}

https://circuitdigest.com/sites/default/files/circuitdiagram_mic/Temperature-Controlled-Fan-.gif

Code as follows -

#include<DHT11.h>

#include<LiquidCrystal.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2); #define dht11pin 12 dht11 DHT11; #define pwm 9 byte degree[8] = { 0b00011, 0b00011, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000 }; void setup() { lcd.begin(16, 2);

lcd.createChar(1, degree);

lcd.clear();

lcd.print(" Fan Speed ");

lcd.setCursor(0,1);

lcd.print(" Controlling ");

delay(2000);

analogWrite(pwm, 255);

lcd.clear();

lcd.print("Our Project ");

delay(2000);

}

void loop() { DHT11.read(dht11pin);

int temp=DHT11.temperature;

lcd.setCursor(0,0);

lcd.print("Temperature:");

lcd.print(temp);

lcd.write(1);

lcd.print("C");

lcd.setCursor(0,1);

if(temp <26 ) { analogWrite(9,0); lcd.print("Fan OFF "); delay(100); }

else if(temp==26)
{
  analogWrite(pwm, 51);
  lcd.print("Fan Speed: 20%   ");
  delay(100);
}

 else if(temp==27)
{
  analogWrite(pwm, 102);
  lcd.print("Fan Speed: 40%   ");
  delay(100);
}

 else if(temp==28)
{
  analogWrite(pwm, 153);
  lcd.print("Fan Speed: 60%   ");
  delay(100);
}

else if(temp==29)
{
  analogWrite(pwm, 204);
  lcd.print("Fan Speed: 80%    ");
  delay(100);
}
 else if(temp>29)
{
  analogWrite(pwm, 255);
  lcd.print("Fan Speed: 100%   ");
  delay(100);
} 

delay(3000); }

I used the default LiquidCrystal.h library for this project. Is that wrong?

PS - i am new here , so sorry if i didn't follow the guidelines while posting this question. Thanks in advance for any help!

Code as follows -

#include<DHT11.h> 

#include<LiquidCrystal.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
#define dht11pin 12 
dht11 DHT11;
#define pwm 9
byte degree[8] = 
              {
                0b00011,
                0b00011,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000
              };
void setup()
{
 lcd.begin(16, 2);

 lcd.createChar(1, degree);

 lcd.clear();

 lcd.print("   Fan Speed  ");

 lcd.setCursor(0,1);

 lcd.print("  Controlling ");

 delay(2000);

 analogWrite(pwm, 255);

 lcd.clear();

 lcd.print("Our Project ");

 delay(2000);

}

void loop()
{
  DHT11.read(dht11pin);

  int temp=DHT11.temperature;

  lcd.setCursor(0,0);

  lcd.print("Temperature:");

  lcd.print(temp);

  lcd.write(1);

  lcd.print("C");

  lcd.setCursor(0,1);

  if(temp <26 )
    { 
      analogWrite(9,0);
      lcd.print("Fan OFF  ");
      delay(100);
    }
    
    else if(temp==26)
    {
      analogWrite(pwm, 51);
      lcd.print("Fan Speed: 20%   ");
      delay(100);
    }
    
     else if(temp==27)
    {
      analogWrite(pwm, 102);
      lcd.print("Fan Speed: 40%   ");
      delay(100);
    }
    
     else if(temp==28)
    {
      analogWrite(pwm, 153);
      lcd.print("Fan Speed: 60%   ");
      delay(100);
    }
    
    else if(temp==29)
    {
      analogWrite(pwm, 204);
      lcd.print("Fan Speed: 80%    ");
      delay(100);
    }
     else if(temp>29)
    {
      analogWrite(pwm, 255);
      lcd.print("Fan Speed: 100%   ");
      delay(100);
    } 
  delay(3000);
}

I used the default LiquidCrystal.h library for this project. Is that wrong?