in order to start the car you have to blow to the sensor having a flowsensor (can be madeform a heated filament when blown the resistance drops and this can be detected. but for test we use condensor MIC) . its also coupled with a alcohol sensor. it is passed through a combinational logic and then a decision is taken whether to turn on / off the engine.
>>the sensor is attached with the lm3914
>>the output is attached to 74147
>>the outputs will get high in bargraph mode
>>it is decoded by 74147
>>its given to 7447 ( 7 segment decoder)
>>the alcohol level is displayed to 7 segment.
>>the lm 741 is used as a flow detector (in place of switch use a condenser MIC)
>>the maximum alcohol level is detected by 3914 and its use to trigger a latch
>>the output is anded with the input from flow sensor.
>> then its passed to a transistor logic for turning on the path to the engine.
View attachment asdasd.zip
Alcohol detector and engine cut off.
in order to start the car you have to blow to the sensor having a flowsensor (can be madeform a hea