Abstract
An intelligent water regime detection system was designed for water detection. In the designed system, water level is detected by a pressure sensor and water pH is detected by a pH meter. After being processed by the AD chip TLC2543, the data are sent to the MCU via serial communication and the detection result is displayed on OLED screen or Bluetooth mobile phone. The software adopts time-sharing and power-down operation modes, and combines the relay to turn on/off the MCU peripheral circuit to reduce power consumption. The measurement deviations of water level, pH, and voltage were respectively less than 2 mm, 0.1, and 0.01 V and the minimum operating current was less than 6 mA. The low-power, high-precision and intelligent water regime detection is realized by the designed system.
Highlights
Water is closely related to human life
The pH is generally detected with pH indicator or pH test paper, but the detection precision is not high and the detection result may be affected by contamination
We designed and produced the prototype of an intelligent detection system, which could quickly realize the detection of water level and pH with high precision and low power consumption in an easy operation way
Summary
The MCU is characterized by the strong arithmetic operation, fast processing speed, flexible software programming, and simple arithmetic and logic control and widely applied in various fields due to its low cost, low power consumption, hibernation function and fast operation speed. The main sensing element in the sensor is a pressure-sensitive film, which is connected to a flexible resistor. When the pressure to be measured is changed, the film deforms as pressure decreases or increases and the resistance of flexible resistor becomes larger or smaller. A pH composite electrode is used to measure water pH in the system. The composite electrode is a chemical sensor for converting H+ decay rate of a solution into a certain potential signal and widely applied in pH measurement. Before pH measurement, positioning and slope calibration must be performed with a standard buffer solution with known pH [4]
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