Design of Multi-Functional Alcohol Concentration Detecting System

Abstract

This paper is mainly design of alcohol concentration detector. Single chip microcomputer STC89C52 is employed to process data and control logic. Alcohol concentration sensor MQ-3 as its core detection device, which test the ethanol vapor concentration in the air. AD converter ADC0832 as auxiliary chips, which convert MQ-3 alcohol concentration sensor output analog voltage into corresponding digital voltage, and transmit its value into the core device. Ultrasonic ware sensor HC-SR04 can measure body distance, and adjust body weather within the 30cm safely distance. LCD1602 as display screen, which display alcohol concentration and detect distance. Test results proved that the system has higher precision and practicability, and is very effectively and economically. Introduction At present, most countries are using the breath alcohol concentration tester driving personnel on-site testing to ensure the safety of the driver’s life and property. Alcohol concentration sensor can detect the driver's breath alcohol density, breath alcohol steam combustion chemical reaction happens within the sensor voltage, measure the voltage value can get the corresponding alcohol density, more than warning value, represents the driver and the drunk driving, system alarm. In this system also join the ultrasonic ranging, open in the driver's proximity sensor detection, in order to prevent the error of the disturbance of environment. In this paper a new optimal design of soccer robot control system which is based on mechanical analyses and calculations on the pressure and transmutation states of chip kick mechanics, this new control system with high precision for speed control and high dynamic quality. The alcohol concentration testing device contains four types, there are cell fuel type, semi-conductor type, infrared type, gas chromatographic analysis and color type. Because of price, cell fuel type and semiconductor type are mainly popular on the market currently. Cell fuel type is the new energy in environmental research, can put the chemical energy of gas directly into electricity without pollution. Alcohol sensor just a small branch of it, in the combustion chamber filled with special chemical catalyst, blowing alcohol steam and combustion generating voltage, measure the output voltage can obtain the corresponding alcohol value. Compared with the semiconductor type, the cell fuel type of respiratory alcohol concentration tester has better stability, accuracy and anti-interference. However, due to the structure is relatively reasonable, and the production costs are higher and manufacturing is difficulty, only a few countries can produce. System Structure The system with simple design, mainly composed of AT89C52 microcontroller circuit, MQ-3 alcohol concentration sensor, ultrasonic ranging module, amplifying circuit, ADC0832, buzzer, LCD1602 display, power module, and LED indicator. The ultrasonic ranging can detect human within a given range and by MQ-3 alcohol concentration sensor to detect the concentration of alcohol to a voltage signal output through the DAC0832 input to the MCU with the given value, and the realization of the LCD1602 display, the concentration of more than a given value will alarm. MQ-3 alcohol concentration sensor output linear signal voltage can be directly through the size of 5th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2015) © 2015. The authors Published by Atlantis Press 881 the voltage signal in the MCU programming to the concentration corresponding to the value. In order to prevent the interference signal, two MQ-3 alcohol concentration sensor is adopted to take the average value, and join the ultrasonic ranging module to prevent in the people did not close on space of detection concentration cause interference. The system structure block diagram is shown as Fig.1. Serial communication interface Main control chip STC89C52 Program download Ultrasonic ranging module Measure the distance ADC0832 Digital voltage MQ-3 Alcohol concentration sensor Analog voltage The LED light Concentration ratio output Transistor amplifier circuit switch Measure the distance Sound and light alarm system Alarm signal LCD1602 display Various parameters Fig.1 System Structure Block Diagram