The measurement of hydrological data such as water level, water temperature and flow rate has always been the focus of the hydropower station department. At present, the functions of domestic hydrological collection systems are mainly based on the collection and transmission of data, and the functions of water conservancy equipment are rarely controlled according to the on-site water conditions. The intelligent hydrological monitoring system designed by the hydrological manager can set the upper and lower limits of the water level through the main control computer to realize the automatic control of the operation of the water conservancy equipment. It can also set the upper and lower limits directly through the button in the field when the network fails. There are few functions in the product for self-checking the intelligent monitoring system. The system can check the intelligent monitoring system at different positions by the simulated water level signal set by the upper computer software at any time to determine whether the data is too large or not to ensure the security and reliability of the data.
Data acquisition front end AD circuit module
Usually, the collection of hydrological information uses various sensors developed by different companies. Some of the outputs of the sensors are directly switching or digital signals, but the output of many types of sensors is an analog voltage or analog current signal that reflects the measured non-electricity. The analog voltage or current signals output by such sensors need to be converted to corresponding digital signals before they can be processed by the microcontroller. Therefore, the system has designed a functional module for analog-to-digital conversion. The A/D converter used in this module is a 10-bit analog conversion serial device TLC1549 produced by TI. TLC1549 is sent to the MCU in serial mode. The three control pins of TLC1549 and the P1.7 (digital signal output), P1.6 (clock) and P1.5 (chip select) of the P1 port of the MCU are three general I. /O is connected to form a serial interface, and the clock is generated by the internal program of the MCU to control the data transmission between the MCU and the TLC1549. The interface circuit between MCU and TLC1549 is shown in Figure 2:
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