Based on SCM preventing drunken driving control system circuit design
Abstract: Aimed at the increasing accidents caused by drunk driving,a anti drunk driving control system is designed.
The designed system is constructed with alcohol sensor, the ADC0809 converter, the 89C51MCUcontroller, speech warning system, LED, relay and the motor, etc. The conversion between voltage and concentration in different range is treated as linear relationship. Conversing the voltage signal through the A/D conversion at the control of the single-chip, obtaining the digital voltage signal; displaying the concentration in the digital tube display module. When the alcohol testing result exceeds the safe limit, power supp ly of the starting system will be cut to stop the car from start up.
The designed system requires the driver to take a breath-test before the ignition can be turned on and activates a lock if the result is above a certain level. The device is seen as a way to stop people who have been convicted of driving under the influence from offending again.
Keywords: Gas sensor, A/D conversion, Single-chip Microcomputer