Based on SCM preventing drunken driving control system circuit design
Abstract: The drunken driving control system are gaining in trends. It is the computer technology and automatic control theory and control technology closely integrated alcohol measurement product.
In this paper, study design car for the detection and alarm functions with an alcohol concentration of intelligent system, and real-time display alcohol concentration.It has realized automatic detection and control function.In this thesis, the concentration of alcohol can be measured and displayed by using the gas sensor based on STC89C51 Single-chip Microcomput . By alcohol sensor MR513, ADC0809 converter, voice alarm, LED display, relays and motor, etc. Will the collected simulation voltage signal via A/D conversion, into A single-chip microcomputer, Through the single-chip microcomputer control calculation output control signal.When the gas sensor induced strength of alcohol exceeding the allowed figure, transformed the digital signaling output the electrical signal. And sends out resounds the caution to drive the personnel not to drive, and locks up automobile's ignition system with the relay.Meanwhile give out sound and light alarm, and through digital tube real-time display alcohol concentration, has realized automatic control function.,thus safeguards the pilot and passenger's safety.
This system design in the warning circuit can be applied to actual life, the prevention driver that it can be better on the other hand drives after drinking, reduce the incidence of the traffic accident. It is obvious this circuit has extensive using value, worth further investigating
Keyword: Gas sensor A/D conversion Single-chip Microcomput Gas measurement