The main aim of this Alcohol Breath Analyser with LCD Interface project is to monitor the vehicles for drunk drivers and if the alcohol content is detected, the system should alert the siren.

Alcohol gas sensor will be fixed in the system. The status of the sensor will be continuously monitored by the microcontroller. Whenever the status of the sensor changes, the micro controller detects this and immediately alerts the siren.

The main aim of this Alcohol Breath Analyser with LCD Interface project is to continuously monitor the status of the alcohol gas detector and if its output triggers, the controlling unit activates the buzzer so as to alert the surroundings.

Alcohol gas detector will be interfaced with the microcontroller through a comparator. The comparator is interfaced with the microcontroller. The microcontroller cannot drive the buzzer and cannot provide the current required for the buzzer. Thus, the buzzer will be interfaced to the microcontroller through the transistor. In this case, the transistor acts as a current driver.

Software Tools:

  1. Keil compiler
  2. Embedded C
  3. Orcad.

Hardware Tools:

  1. Microcontroller AT89S52.
  2. Alcohol Gas detector.
  3. Buzzer circuit
  4. LM358 OP-AMP
  5. 16*2 LCD DISPLAY

Block Diagram: