Need help with CODE that connects MQ-7 to Character LCD

Using Arduino Programming Questions
#1

Hello, I’m currently using this wiring to connect the MQ-7 and LCD together, but I can’t get the code working
Link to wiring

Currently this is the Code, and I’m using it from the tutorial

int mqx_analogPin = A0; // connected to the output pin of MQ-X

void setup(){
  Serial.begin(9600); // open serial at 9600 bps
}

void loop()
{
  // give ample warmup time for readings to stabilize

  int mqx_value = analogRead(mqx_analogPin);
  Serial.println(mqx_value);

  delay(100); //Just here to slow down the output.
}
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
{
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("CO ppm");
}

void loop()
{
  // give ample warmup time for readings to stabilize

  int mqx_value = analogRead(mqx_analogPin);
  lcd.setCursor(0, 1);
  lcd.print(mqx_value);

  delay(100); //Just here to slow down the output.
}

I keep getting errors, and can guys you help me get the code working please
Link to Tutorial, and the code is from the tutorial

#2

hi.
all librarys need to be declaired above the void setup().
and its only allowed to create a Void function one time!

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);


byte mqx_analogPin = A0; // connected to the output pin of MQ-X
/* or 
#define mqx_analogPin A0
const byte mqx_analogPin = A0;
this way it doesnt take any variable memory from you arduino.
*/
int mqx_value; // this is a global variable

void setup() {
  Serial.begin(9600); // open serial at 9600 bps

  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("CO ppm");
}

void loop()
{
  // int mqx_value; // or you make it a local variable.
  // give ample warmup time for readings to stabilize

  mqx_value = analogRead(mqx_analogPin);
  Serial.println(mqx_value);
  lcd.setCursor(0, 1);
  lcd.print(mqx_value);
  delay(100); //Just here to slow down the output.

}
#3

Thanks!

#4