Driver alcohol detection alarm controller circuit

Published:2011/5/5 2:31:00 Author:Christina | Keyword: Driver, alcohol detection, alarm controller | From:SeekIC

The driver alcohol detection alarm controller circuit is as shown in the figure. The QM-NJ9 is alcohol gas sensor, if it detects the alcohol odor, the resistance of QM-NJ9 between A and B will shrink, and the wiper potential of potentiometer RPl will rise up. When the voltage level is 1.6V, the ICl high-power switching device TWH8778 is connected to make the IC2 voice IC TM801 to work, the output is amplified by the IC3 integrated amplifier LM386, and then the amplified output drives the speaker BLl to send out alarm. Meanwhile, the relay J1 gets the power to start working, the contact point disconnects and cuts off the car ignition circuit to stop the engine, to achieve the purpose of control the drivers drink and drive.



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