Signal input circuit for disaster prediction terminal

Abstract

The invention discloses a signal input circuit for a disaster prediction terminal. The signal input circuit comprises a triode T1 and a triode T2, the base electrode of the triode T1 is connected with a power source V1 through a switch S, the collector electrode of the triode T1 is connected to the negative electrode of a diode D1, the positive electrode of the diode D1 is connected with a power source V2 through a resistor R2, the positive electrode of the diode D1 is connected to the base electrode of the triode T2, the collector electrode of the triode T2 is connected to the input end of a chip 74LS240 and connected with a power source V3 through a resistor R3, the voltage value of the power source V1, the voltage value of the power source V2 and the voltage value of the power source V3 become smaller in sequence, and the emitting electrode of the triode T1 and the emitting electrode of the triode T2 are connected with the ground. The signal input circuit is suitable for long distance transmission of data, outside interference is avoided, and the disaster prediction accuracy of the disaster prediction terminal is improved.

Description

[0001] technical field [0002] The invention relates to the field of disaster prediction terminals, in particular to a signal input circuit for a disaster prediction terminal. Background technique [0003] Sichuan is located in a basin with a large amount of water, making it a place where floods and droughts frequently occur. Climate change, intensified production activities, and extreme weather events have exacerbated the occurrence of floods and droughts. As one of the most serious natural disasters in the world, floods occur in our country almost every year, and its frequency and the casualties and property losses caused by other natural disasters are much higher than those in developed countries. [0004] So far, the direct economic losses caused by the floods have reached more than 200 billion yuan, and the number of dead and missing people has exceeded 2,000. And the huge torrent and mudslide disaster similar to Zhouqu caused huge casualties and property losses...

AI Technical Summary

Problems solved by technology

[0005] The disaster prediction terminal is basically controlled by a microprocessor, and the data acquisition device is generally located outdoors. Each data acquisition device transmits the collected data such as rainfall and water level to the microprocessor for processing. In order to ensure the safety of the microprocessor, The cabinet equipped with a microprocessor is generally installed indoors or in a place with a better environment, and there is a certain distance between the data acquisition device and the microprocessor. When the low-voltage signal is transmitted over a long distance, the external interference is strong, making the subsequent Precision and accuracy are compromised when analyzing data

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