Frost Alarm Circuit

Published:2011/5/8 6:45:00 Author:Robert | Keyword: Frost, Alarm | From:SeekIC

In the natural disasters, the frost's damage to crops is very serious which can have a direct impact to crop yield.The frost alarm circuit introduced in this picture, can have the alarm sounds when the environmental temperature is lower than 1℃ to remind the farmers to prepare for anti-forst in time.The circuit's working principle is shown below.This frost alarm circuit is made up by power circuit, temperature monitoring control circuit and alarm circuit which is shown in the picture below. The power circuit is made up be battery GB, power switch S and electron-contact thermometers Q.The alarm circuit is made up by the sound effect integrated circuit IC, resistance R2, R3, transistor V and speaker BL.When the power switch S is connected, the alarm circuit is in alert mode. When the environmental temperature is higher than 1℃, the Q's electrical thermal control contactor is disconnected and the alarm circuit is not working and BL has no sound. When the environmental temperature decrease to 1℃ or less, the Q's electrical thermal contactor is connected to trigger the IC to work. The sound effect electrical signal from the IC's 3 foot is amplified by V to drive the BL to play the alarm sound.V uses 59013 or CW9561 type sound effect integrated circuit.



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