I need this code checked fro errors. Its for an Arduino Uno 2, When I upload the code, i get no output printed on the LC

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I need this code checked fro errors. Its for an Arduino Uno 2,When I upload the code, i get no output printed on the LCD displayand the system doesnt operate as it should.
/* MQ-3 Alcohol Sensor Circuit with Arduino */#include <LiquidCrystal.h>
//const int AOUTPin=A0;//the AOUT pin of the alcohol sensor goesinto analog pin A0 of the arduinoconst int DOUTPin=A0;//the DOUT pin of the alcohol sensor goes intodigital pin D8 of the arduinoconst int ledPin=6;//the anode of the LED connects to digital pinD13 of the arduinoconst int buzzPin = 7;const int IN1 = 8;const int IN2 = 9;const int switchpin = 5;int buttonState = 0; int alcohol = A0;
int sm=1;int limit=150;int value;LiquidCrystal lcd(12, 13, A2, A3, A4, A5);void setup() { Serial.begin(9600);//sets the baud rate // set up the LCD's number of columns androws: lcd.begin(16, 2); Serial.begin(9600); //pinMode(alcohol, INPUT); pinMode(buzzPin,OUTPUT); pinMode(IN1,OUTPUT); pinMode(IN2,OUTPUT); pinMode(DOUTPin, INPUT);//sets the pin as aninput to the arduino pinMode(ledPin, OUTPUT);//sets the pin as anoutput of the arduino pinMode(switchpin, INPUT);// pinMode(AOUTPin, INPUT);// set pinINput digitalWrite(IN2,LOW); digitalWrite(IN1,LOW); lcd.clear(); lcd.print(" Alcohol"); lcd.setCursor(0,1); lcd.print("Detection System"); delay(5000); lcd.begin(16, 2); lcd.print("Press Switch"); }
void loop(){sm=1;buttonState = digitalRead(switchpin);if(buttonState==0) { lcd.clear(); lcd.begin(16, 2); lcd.print("Please Wait..."); buttonState = digitalRead(switchpin); while(sm==1) { //lcd.clear(); // lcd.begin(16, 2); // value= digitalRead(alcohol);// Serial.println(value); // lcd.print( value);//reads the analaog value fromthe alcohol sensor's AOUT pin // delay(300); //limit= digitalRead(DOUTPin);//reads the digitalvalue from the alcohol sensor's DOUT pin //Serial.print("Alcohol value: "); //Serial.println(value);//prints the alcoholvalue //Serial.print("Limit: "); //Serial.print(limit);//prints the limit reached aseither LOW or HIGH (above or underneath) delay(1000); if (value == HIGH) { lcd.clear(); //lcd.begin(16, 2); digitalWrite(ledPin, LOW);//if limit has beenreached, LED turns on as status indicator lcd.print(" Alcohol Level"); lcd.setCursor(0,1); lcd.print(" Under limit"); delay(1000); lcd.clear(); lcd.begin(16, 2); lcd.print("Engine Running "); digitalWrite(IN1,HIGH); digitalWrite(IN2,LOW); digitalWrite(buzzPin,LOW); digitalWrite(ledPin,LOW); delay(2000); } buttonState = digitalRead(switchpin); if(buttonState==0) { lcd.begin(16, 2); lcd.print("Engine stop"); digitalWrite(IN2,LOW); digitalWrite(IN1,LOW); digitalWrite(buzzPin,LOW); digitalWrite(ledPin,LOW); delay(1000); lcd.begin(16, 2); lcd.print("Press Switch"); sm=0; buttonState=1; delay(1000); } value= digitalRead(alcohol); if (value == LOW) { lcd.begin(16, 2); lcd.print("Enginestop"); digitalWrite(IN2,LOW); digitalWrite(IN1,LOW); digitalWrite(buzzPin,HIGH); digitalWrite(ledPin,HIGH); sm=0; buttonState=1; delay(2000); digitalWrite(buzzPin,LOW); digitalWrite(ledPin,LOW); } } if (value == LOW) { lcd.clear(); lcd.begin(16, 2); digitalWrite(ledPin, HIGH);//if threshold notreached, LED remains off lcd.print(" Alcohol Level"); lcd.setCursor(0,1); lcd.print(" Over limit"); digitalWrite(buzzPin,HIGH); digitalWrite(ledPin,HIGH); delay(3000); digitalWrite(buzzPin,LOW); digitalWrite(ledPin,LOW); lcd.begin(16, 2); lcd.print("Press Switch"); delay(1000); } } }