Engine Water Supply Alarm One

Published:2011/7/7 3:07:00 Author:Felicity | Keyword: Engine Water Supply Alarm | From:SeekIC

While the engine is not short of water, the electrode of the sensor is connected to ground (the iron) to make the voltage of pin 2 and pin 6 at low level (lower than Vcc/3). The output of pin 3 is at high level to make V1 on, and V2 cut off, then HA is noiseless and HL is off. While the water level of the engine is below the electrode of the sensor, the voltage of pin 2 and pin 6 are at high level (higher than 2Vcc/3). The circuit of IC changes and pin 3 outputs low voltage to make V1 cut off ,and V2 on, and then HA send out beeps and HL is also on to warn the driver the engine is short of water.



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