Arduino Based Alcohol Detector

 

Circuit Diagram :- 

Component List :-

1. Arduino Nano 

2. 16x2 LCD Display 

3. 10k Potentiometer

4. Green LED

5. Red LED 

6. MQ-3 Sensor 

7. Zero PCB

Code :- 

//prateek singh //www.prateeks.in #include <LiquidCrystal.h> LiquidCrystal lcd(12,11,10,9,8,7); #define sensor A3 #define led 3 #define buz 2 void setup() { Serial.begin(9600); lcd.begin(16,2); lcd.print("Alcohol Detector"); lcd.setCursor(0,1); lcd.print("www.prateeks.in"); delay(2000); pinMode(sensor, INPUT); pinMode(buz, OUTPUT); pinMode(led, OUTPUT); lcd.clear(); } void loop() { float adcValue=0; for(int i=0;i<10;i++) { adcValue+= analogRead(sensor); delay(10); } float v= (adcValue/10) * (5.0/1024.0); float mgL= 0.67 * v; Serial.print("BAC:"); Serial.print(mgL); Serial.print(" mg/L"); lcd.setCursor(0,0); lcd.print("BAC: "); lcd.print(mgL,4); lcd.print(" mg/L "); lcd.setCursor(0,1); if(mgL > 0.3) { lcd.print("Drunk "); Serial.println(" Drunk"); digitalWrite(buz, HIGH); digitalWrite(led, HIGH); } else { lcd.print("Normal "); Serial.println(" Normal"); digitalWrite(buz, LOW); digitalWrite(led, LOW); } delay(100); }


Video :-