Novel simple TDS water quality detection circuit

Abstract

The utility model discloses a novel simple TDS (total dissolved solid) water quality detection circuit, which belongs to the technical field of TDS water quality detection and is characterized in that a pin 1 of a connector CN3 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with an output end of a direct-current power supply VCC, a pin 2 of the connector CN3 is connected with a pin at one end of a capacitor C13, a pin at the other end of the capacitor C13 is connected with a GND (ground) end, and the other end of the capacitor C13 is connected with the GND end. A pin 1 of a connector CN3 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with an output end of a direct-current power supply VCC, a pin 2 of the connector CN3 is connected with a pin at one end of a capacitor C13, and a pin at the other end of the capacitor C13 is connected with a GND end, so that a detection circuit is formed, input and output switching is carried out through a TDS1A port, an AD value is read instantly through switching, and the detection precision is improved. The TDS value of the current water quality is obtained through a programmed algorithm, TDS detection can be achieved only through one IO port, polarization of the probe can be prevented, meanwhile, a circuit can be simplified, and occupied resources of a single-chip microcomputer are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of TDS water quality detection, and particularly relates to a new and simple TDS water quality detection circuit. Background Art

[0002] The existing TDS water quality detection circuit uses three IO ports for detection and control. TDS1_A and TDS1_B are used for forward and reverse driving of the TDS probe to prevent probe polarization. TDS1_ADC is used by the microcontroller to read the AD value and calculate the TDS value of the current water quality through the algorithm. This method requires three IO ports, and the algorithm program is complex, occupying more microcontroller resources. Utility Model Content

[0003] In order to solve the problems raised in the above background technology, the utility model provides a new simple TDS water quality detection circuit, which has the characteristics of simplifying the circuit and reducing the resource occupation of the single chip computer.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a new type of simple TDS water quality detection circuit, wherein pin 1 of the connector CN3 is connected to one end of the resistor R49, the other end of the resistor R49 is connected to the output end of the DC power supply VCC, pin 2 of the connector CN3 is connected to one end of the capacitor C13, and the other end of the capacitor C13 is connected to the GND end.

[0005] Preferably, the supply voltage of the DC power supply VCC is 5V.

[0006] Preferably, the resistance value of the resistor R49 is 2000 ohms.

[0007] Preferably, the capacitance of the capacitor C13 is 0.1 μF.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] The utility model forms a detection circuit by connecting pin 1 of connector CN3 to one end of resistor R49, connecting the other end of resistor R49 to the output end of DC power supply VCC, connecting pin 2 of connector CN3 to one end of capacitor C13, and connecting the other end of capacitor C13 to GND. Input and output are switched through port TDS1_A, AD values ​​are read at the moment of switching, and the TDS value of the current water quality is obtained through a program algorithm. This method only requires one IO port to realize TDS detection, which can prevent polarization of the probe while simplifying the circuit and reducing the occupation of single-chip computer resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a TDS water quality detection circuit of the utility model. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] See also Figure 1 The utility model provides the following technical solutions: a new type of simple TDS water quality detection circuit, wherein pin 1 of connector CN3 is connected to one end of resistor R49, the other end of resistor R49 is connected to the output end of DC power supply VCC, pin 2 of connector CN3 is connected to one end of capacitor C13, and the other end of capacitor C13 is connected to GND.

[0013] Specifically, the supply voltage of the DC power supply VCC is 5V.

[0014] By adopting the above technical solution, the stability of the supply voltage during detection is guaranteed.

[0015] Specifically, the resistance value of the resistor R49 is 2000 ohms.

[0016] By adopting the above technical solution, the stability of the circuit is ensured and the circuit is protected.

[0017] Specifically, the capacitance of capacitor C13 is 0.1 μF.

[0018] By adopting the above technical solution, the stability of the circuit is ensured and the circuit is protected at the same time.

[0019] The working principle and usage process of the utility model are as follows: the utility model forms a detection circuit by connecting pin 1 of the connector CN3 to one end of the resistor R49, connecting the other end of the resistor R49 to the output end of the DC power supply VCC, connecting pin 2 of the connector CN3 to one end of the capacitor C13, and connecting the other end of the capacitor C13 to the GND end. The input and output are switched through the TDS1_A port, the AD value is read at the moment of switching, and the TDS value of the current water quality is obtained through the program algorithm. This method only requires one IO port to realize TDS detection, which can prevent the polarization of the probe and simplify the circuit, reducing the occupation of the single-chip computer resources.

[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of simple TDS water quality detection circuit, including connector CN3, characterized by: Pin 1 of the connector CN3 is connected to one end of the resistor R49, the other end of the resistor R49 is connected to the output end of the DC power supply VCC, pin 2 of the connector CN3 is connected to one end of the capacitor C13, and the other end of the capacitor C13 is connected to the GND end. The supply voltage of the DC power supply VCC is 5V.

2. A novel simplified TDS water quality detection circuit according to claim 1, characterized in that: The resistance value of the resistor R49 is 2000 ohms.

3. A novel simplified TDS water quality detection circuit according to claim 1, characterized in that: The capacitance of the capacitor C13 is 0.1 μF.

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