CN209910780U - Mixing box liquid level on-line measuring device - Google Patents
Mixing box liquid level on-line measuring device Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000000007 visual effect Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 24
- 239000013078 crystal Substances 0.000 claims description 15
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000002262 irrigation Effects 0.000 description 8
- 238000003973 irrigation Methods 0.000 description 8
- 239000003337 fertilizer Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000004720 fertilization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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Abstract
The utility model relates to a mixing box liquid level on-line measuring device belongs to liquid level detection technical field. The utility model is used for provide a high level of at least 10us for ultrasonic ranging module makes ultrasonic ranging module begin work; the square wave of 40KHZ is sent in a circulating mode, the ultrasonic ranging module sends a high level to the single chip microcomputer module after receiving an echo signal reflected from the liquid level, the single chip microcomputer module obtains the distance from the liquid level to the ultrasonic ranging module and the liquid level at the moment according to the duration time of the high level, the distance and the liquid level are displayed on the liquid crystal display module, and if the obtained liquid level is not within the range set by the single chip microcomputer module, the single chip microcomputer module drives the sound-light alarm module to give sound-light alarm. The utility model discloses realize the real-time non-contact measurement of mixing box liquid level, carry out real-time display to the mixing box liquid level, if the liquid level carries out audible and visual alarm when not setting for the within range.
Description
Technical Field
The utility model relates to a mixing box liquid level on-line measuring device belongs to liquid level detection technical field.
Background
China is a big agricultural country in the world, agriculture is a big post industry in China, good development of agriculture is not separated from advanced irrigation technology, the irrigation technology in China is relatively lagged behind, the degree of automation is very low, the automatic irrigation detection technology is not mature, and therefore an irrigation system with high automation is developed to play a great role in development of agriculture in China. The water and fertilizer mixing automatic control system has important practical significance and popularization and application values, and plays a great role in the effective production of agriculture. Aiming at the actual needs of a domestic water and fertilizer irrigation system, the water and fertilizer mixing is automatically monitored in real time, and water and fertilizer solution mother liquor are directly output to a main pipe of an irrigation pipe network after being mixed on line according to a certain proportion, so that the precise irrigation and fertilization are realized. During the period, the liquid level of the water-fertilizer mixing buffer tank is required to be monitored in real time and displayed in real time.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the utility model provides a mixing box liquid level on-line measuring device realizes the real-time non-contact measurement of mixing box liquid level, shows in real time the mixing box liquid level, if the liquid level carries out audible and visual alarm when not setting for the within range.
The utility model adopts the technical scheme that: a mixing box liquid level on-line detection device comprises a singlechip module 1, an ultrasonic ranging module 2, a liquid crystal display module 3 and an audible and visual alarm module 4;
the power supply terminal VCC, the control terminal Trig and the receiving terminal Echo of the ultrasonic ranging module 2 are respectively connected with VCC, P2.1 and P2.0 ports of the singlechip module 1; D0-D7, RS, R/W and E enable ends of the liquid crystal display module 3 are respectively connected with P0.0-P0.7, P2.6, P2.5 and P2.7 ports of the singlechip module 1; the buzzer of the sound and light alarm module 4 is connected with the P1.0 of the single chip microcomputer module 1 through a triode and a resistor R7, and the LED indicator lamps D2 and D3 of the sound and light alarm module 4 are respectively connected with the P1.1 and P1.2 ports of the single chip microcomputer module 1 through resistors R6 and R8.
Further, the single chip microcomputer module 1 is used for driving the ultrasonic ranging module 2 to work, receiving signals output by the ultrasonic ranging module and driving the sound-light alarm module 4 to work; specifically, the single chip microcomputer module 1 provides a high level of at least 10us for the ultrasonic ranging module 2, so that the ultrasonic ranging module 2 starts to work, receives the high level sent by the ultrasonic ranging module 2, records the time of continuously receiving the high level, obtains the distance from the liquid level to the ultrasonic ranging module 2 and the liquid level at the moment according to the time and the speed of ultrasonic waves at the room temperature, and drives the sound-light alarm module 4 to give a sound-light alarm if the liquid level is not in the set range;
the ultrasonic ranging module 2 is used for circularly sending 40KHZ square waves and receiving echo signals reflected from the liquid level of the mixing tank and then sending a high level to the single chip microcomputer module 1;
the liquid crystal display module 3 is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module 2 to the liquid level in real time;
and the sound-light alarm module 4 is used for carrying out sound-light alarm by being driven by the singlechip module when the liquid level of the mixing box is not within a set threshold range.
Further, the single chip microcomputer module 1 includes: the circuit comprises a single chip microcomputer chip, a reset circuit, a crystal oscillator time sequence circuit and a 12V-to-5V power supply module;
the model of the single chip is STC89C51, the single chip has 40 pins and comprises 4I/O ports P0-P3 with 8 bits in parallel and a control port, the P0 comprises P0.0 to P0.7 ports, the P1 comprises P1.0 to P1.7 ports, the P2 comprises P2.0 to P2.7 ports, and the P3 comprises P3.0 to P3.7 ports, and each port can be used for input and output;
the reset circuit comprises a reset key S1, a 10uf capacitor C1, a 1K resistor R2 and a 10K resistor R1; one end of the reset key S1 is connected with one end of the resistor R2, and the other end is simultaneously connected with one end of the capacitor C1, one end of the resistor R1 and RST/VPD of the singlechip chip; the other end of the resistor R2 is connected with the other end of the capacitor C1, and the other end of the resistor R1 is grounded;
the crystal oscillator sequential circuit comprises a quartz crystal oscillator XTAL with the frequency of 12MHZ and two capacitors C2 and C3 with the frequency of 30 pf; the port 1 of the quartz crystal oscillator XTAL is connected with the XTAL1 port of the single chip, and the port 2 is connected with the XTAL2 port of the single chip; one ends of the capacitors C2 and C3 are respectively connected with the port 2 and the port 1 of the crystal oscillator, and the other ends are commonly connected with a ground end GND;
the power circuit comprises a 1K resistor R3, an indicator light D1, a 220uf capacitor C4 and a 0.1uf capacitor C5; one end of the resistor R3 is connected with a power supply end VCC, and the other end is connected with the display lamp D1; one end of the indicator light D1 is connected with the resistor R3, and the other end is connected with the ground end GND; the capacitors C4 and C5 are connected in parallel and then connected in parallel with the branch circuit formed by connecting R3 and D1 in series.
Furthermore, the ultrasonic ranging module 2 adopts an HY-SRF05 ultrasonic ranging module;
the ultrasonic ranging module 2 comprises five interfaces, namely a power interface VCC, a control end Trig, a receiving end Echo, a switching value output end OUT and a ground end GND; the power interface VCC, the ground port GND control terminal Trig and the receiving terminal Echo are respectively connected with VCC, GND, P2.1 and P2.0 ports of the single chip module 1, and the pin of the switching value output end OUT is empty.
Further, the liquid crystal display module 3 comprises an Lcd1602 liquid crystal display screen and a slide rheostat R4, and is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module 2 to the liquid level;
the liquid crystal display module 3 is provided with 16 ports, D0-D7 are data input and output ends, VSS and VDD are respectively a power ground and a power positive electrode end, RS and R/W are respectively a data command selection end and a read-write selection end, VL is a liquid crystal brightness display port, BLA and BLK are respectively a backlight source positive electrode and a backlight source negative electrode, E is an enabling end, and the low level is effective; D0-D7, RS, R/W and E enable ends of the Lcd screen of the Lcd1602 are respectively connected with ports P0.0-P0.7, P2.6, P2.5 and P2.7 of a singlechip chip STC89C 51; VDD of the Lcd1602 liquid crystal display is connected with one end of a slide rheostat R4 and VCC, one end of the slide rheostat R4 is grounded, and VL of the Lcd1602 liquid crystal display is connected with a sliding end of a slide rheostat R4; BLA and BLK are connected to power supply terminal VCC and ground terminal GND, respectively.
Further, the sound and light alarm module 4 comprises a green LED indicator lamp D2, a red LED indicator lamp D3, resistors R5, R6, R7, R8, a PNP tube Q1 and a buzzer LS1, and is used for giving a sound and light alarm when the liquid level of the mixing tank is higher than or lower than the numerical range of the liquid level of the mixed liquid set by the single chip microcomputer module 1;
one end of a green LED indicator lamp D2 and one end of a red LED indicator lamp D3 are connected with VCC, the other ends of the green LED indicator lamp D2 and the red LED indicator lamp D3 are respectively connected with P1.1 and P1.2 ports of the single chip microcomputer module 1 through resistors R6 and R8, an emitter of the PNP tube Q1 is connected with VCC, a collector is connected with a buzzer LS1, the other end of the buzzer LS1 is grounded through a resistor R5, and a base of the PNP tube Q1 is connected with the P1.0 port of the single chip microcomputer module 1 through a resistor R.
The utility model discloses a theory of operation is:
the single chip microcomputer module 1 is used for providing a high level of at least 10us for the ultrasonic ranging module 2, so that the ultrasonic ranging module 2 starts to work; 8 square waves of 40KHZ are sent in a circulating mode, the ultrasonic ranging module 2 sends a high level to the single chip microcomputer module 1 after receiving echo signals reflected from the liquid level, the single chip microcomputer module 1 obtains the distance from the liquid level to the ultrasonic ranging module 2 and the liquid level at the moment according to the duration time of the high level and the propagation speed of ultrasonic waves at room temperature, then the distance is displayed on the liquid crystal display module 3, and if the obtained liquid level is not in the range set by the single chip microcomputer module 1, the single chip microcomputer module 1 drives the acousto-optic alarm module 4 to give an acousto-optic alarm.
The utility model has the advantages that:
1. displaying the liquid level value of the mixing box and the distance value between the distance measuring module and the liquid level in real time;
2. whether the liquid level in the mixing box is in a required range or not is detected in real time, acousto-optic alarm is carried out on the liquid level which is not in the range, the method has an important effect on automatic accurate irrigation of agriculture, and the work is stable and effective;
3. the device realizes non-contact measurement, has a protection effect on a measuring device, realizes the purpose of protective measurement, has low cost and can be widely applied.
Drawings
FIG. 1 is a schematic diagram of the overall circuit of the present invention;
FIG. 2 is a block diagram of the present invention;
fig. 3 is a schematic diagram of a circuit of a liquid crystal display module according to the present invention.
Reference numbers in fig. 1-3: the system comprises a single chip microcomputer module, a 2-ultrasonic ranging module, a 3-liquid crystal display module and a 4-acousto-optic alarm module.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1-3, an online liquid level detection device for a mixing tank comprises a single chip microcomputer module 1, an ultrasonic ranging module 2, a liquid crystal display module 3 and an audible and visual alarm module 4;
the power supply terminal VCC, the control terminal Trig and the receiving terminal Echo of the ultrasonic ranging module 2 are respectively connected with VCC, P2.1 and P2.0 ports of the singlechip module 1; D0-D7, RS, R/W and E enable ends of the liquid crystal display module 3 are respectively connected with P0.0-P0.7, P2.6, P2.5 and P2.7 ports of the singlechip module 1; the buzzer of the sound and light alarm module 4 is connected with the P1.0 of the single chip microcomputer module 1 through a triode and a resistor R7, and the LED indicator lamps D2 and D3 of the sound and light alarm module 4 are respectively connected with the P1.1 and P1.2 ports of the single chip microcomputer module 1 through resistors R6 and R8.
Further, the single chip microcomputer module 1 is used for driving the ultrasonic ranging module 2 to work, receiving signals output by the ultrasonic ranging module and driving the sound-light alarm module 4 to work; specifically, the single chip microcomputer module 1 provides a high level of at least 10us for the ultrasonic ranging module 2, so that the ultrasonic ranging module 2 starts to work, receives the high level sent by the ultrasonic ranging module 2, records the time of continuously receiving the high level, obtains the distance from the liquid level to the ultrasonic ranging module 2 and the liquid level at the moment according to the time and the speed of ultrasonic waves at the room temperature, and drives the sound-light alarm module 4 to give a sound-light alarm if the liquid level is not in the set range;
the ultrasonic ranging module 2 is used for circularly sending 40KHZ square waves and receiving echo signals reflected from the liquid level of the mixing tank and then sending a high level to the single chip microcomputer module 1;
the liquid crystal display module 3 is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module 2 to the liquid level in real time;
and the sound-light alarm module 4 is used for carrying out sound-light alarm by being driven by the singlechip module when the liquid level of the mixing box is not within a set threshold range.
Further, the single chip microcomputer module 1 includes: the circuit comprises a single chip microcomputer chip, a reset circuit, a crystal oscillator time sequence circuit and a 12V-to-5V power supply module;
the model of the single chip is STC89C51, the single chip has 40 pins and comprises 4I/O ports P0-P3 with 8 bits in parallel and a control port, the P0 comprises P0.0 to P0.7 ports, the P1 comprises P1.0 to P1.7 ports, the P2 comprises P2.0 to P2.7 ports, and the P3 comprises P3.0 to P3.7 ports, and each port can be used for input and output;
the reset circuit comprises a reset key S1, a 10uf capacitor C1, a 1K resistor R2 and a 10K resistor R1; one end of the reset key S1 is connected with one end of the resistor R2, and the other end is simultaneously connected with one end of the capacitor C1, one end of the resistor R1 and RST/VPD of the singlechip chip; the other end of the resistor R2 is connected with the other end of the capacitor C1, and the other end of the resistor R1 is grounded;
the crystal oscillator sequential circuit comprises a quartz crystal oscillator XTAL with the frequency of 12MHZ and two capacitors C2 and C3 with the frequency of 30 pf; the port 1 of the quartz crystal oscillator XTAL is connected with the XTAL1 port of the single chip, and the port 2 is connected with the XTAL2 port of the single chip; one ends of the capacitors C2 and C3 are respectively connected with the port 2 and the port 1 of the crystal oscillator, and the other ends are commonly connected with a ground end GND;
the power circuit comprises a 1K resistor R3, an indicator light D1, a 220uf capacitor C4 and a 0.1uf capacitor C5; one end of the resistor R3 is connected with a power supply end VCC, and the other end is connected with the display lamp D1; one end of the indicator light D1 is connected with the resistor R3, and the other end is connected with the ground end GND; the capacitors C4 and C5 are connected in parallel and then connected in parallel with the branch circuit formed by connecting R3 and D1 in series.
Furthermore, the ultrasonic ranging module 2 adopts an HY-SRF05 ultrasonic ranging module;
the ultrasonic ranging module 2 comprises five interfaces, namely a power interface VCC, a control end Trig, a receiving end Echo, a switching value output end OUT and a ground end GND; the power interface VCC, the ground port GND control terminal Trig and the receiving terminal Echo are respectively connected with VCC, GND, P2.1 and P2.0 ports of the single chip module 1, and the pin of the switching value output end OUT is empty.
Further, the liquid crystal display module 3 comprises an Lcd1602 liquid crystal display screen and a slide rheostat R4, and is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module 2 to the liquid level;
the liquid crystal display module 3 is provided with 16 ports, D0-D7 are data input and output ends, VSS and VDD are respectively a power ground and a power positive electrode end, RS and R/W are respectively a data command selection end and a read-write selection end, VL is a liquid crystal brightness display port, BLA and BLK are respectively a backlight source positive electrode and a backlight source negative electrode, E is an enabling end, and the low level is effective; D0-D7, RS, R/W and E enable ends of the Lcd screen of the Lcd1602 are respectively connected with ports P0.0-P0.7, P2.6, P2.5 and P2.7 of a singlechip chip STC89C 51; VDD of the Lcd1602 liquid crystal display is connected with one end of a slide rheostat R4 and VCC, one end of the slide rheostat R4 is grounded, and VL of the Lcd1602 liquid crystal display is connected with a sliding end of a slide rheostat R4; BLA and BLK are connected to power supply terminal VCC and ground terminal GND, respectively.
Further, the sound and light alarm module 4 comprises a green LED indicator lamp D2, a red LED indicator lamp D3, resistors R5, R6, R7, R8, a PNP tube Q1 and a buzzer LS1, and is used for giving a sound and light alarm when the liquid level of the mixing tank is higher than or lower than the numerical range of the liquid level of the mixed liquid set by the single chip microcomputer module 1;
one end of a green LED indicator lamp D2 and one end of a red LED indicator lamp D3 are connected with VCC, the other ends of the green LED indicator lamp D2 and the red LED indicator lamp D3 are respectively connected with P1.1 and P1.2 ports of the single chip microcomputer module 1 through resistors R6 and R8, an emitter of the PNP tube Q1 is connected with VCC, a collector is connected with a buzzer LS1, the other end of the buzzer LS1 is grounded through a resistor R5, and a base of the PNP tube Q1 is connected with the P1.0 port of the single chip microcomputer module 1 through a resistor R.
The utility model discloses a use is:
the on-line detection device for the liquid level of the mixing box is arranged at the central position of the top surface of the mixing box on the basis of knowing the height H of the box body of the mixing box in advance. And the water pump is turned on to change the liquid level of the mixed liquid in the mixing box in real time. Supplying power to the mixing tank liquid level on-line detection device, wherein at least 10us of high level signals are provided for a Trig port of the ultrasonic ranging module 2 by a port P2.1 of the single chip microcomputer module 1, 8 40KHZ square waves are circularly emitted by an emission probe of the ultrasonic ranging module 2, the circularly emitted square waves are reflected when reaching the liquid level of mixed liquid in the mixing tank, a high level is emitted from an Echo port of the ultrasonic ranging module 2 when a receiving probe of the ultrasonic ranging module 2 receives the reflected square wave signals, then the high level is sent to a port P2.0 of the single chip microcomputer module 1, the duration time of the high level is the round-trip time T of the square wave signals emitted by the ultrasonic ranging module 2, then the distance value L from the installation position of the mixing tank liquid level detection device to the liquid level of the mixed liquid in the mixing tank is obtained by the single chip microcomputer module 1 according to the time T and the propagation speed V of sound waves in the air under the temperature condition, the level of the mixed liquor in the mixing tank is then D = H-L, given the height H of the mixing tank. The single chip microcomputer module 1 sends the obtained data to the liquid crystal display module 3 through the ports P0.0-P0.7, P2.6, P2.5 and P2.7, the values of the Distance from the installation position of the liquid Level online detection device to the liquid Level of the mixed liquid in the mixing box and the liquid Level of the mixed liquid in the mixing box are respectively displayed on the first line and the second line of the liquid crystal display module 3, and the real-time display is achieved by circulating the steps. If the liquid level of mixed liquid in this mixed case is higher than or is less than the mixed liquid level numerical value that single chip module 1 set for, then single chip module 1's P1.0 becomes high level by the low level, P1.1 becomes low level by the high level and P1.2 mouth becomes high level by the low level for buzzer sound production in the system, red LED pilot lamp is bright, and green LED pilot lamp goes out, reminds personnel on the spot, reaches the real-time detection purpose to mixed liquid level.
The utility model discloses will realize the non-contact measurement of mixing box liquid level, carry out real-time display to the mixing box liquid level, if the liquid level can not reach the requirement and will carry out audible and visual alarm, remind at the scene personnel.
While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a mixing box liquid level on-line measuring device which characterized in that: the ultrasonic ranging system comprises a singlechip module (1), an ultrasonic ranging module (2), a liquid crystal display module (3) and an audible and visual alarm module (4);
the power supply terminal VCC, the control terminal Trig and the receiving terminal Echo of the ultrasonic ranging module (2) are respectively connected with VCC, P2.1 and P2.0 ports of the singlechip module (1); D0-D7, RS, R/W and E enable ends of the liquid crystal display module (3) are respectively connected with ports P0.0-P0.7, P2.6, P2.5 and P2.7 of the singlechip module (1); a buzzer of the sound-light alarm module (4) is connected with the P1.0 port of the single chip microcomputer module (1) through a triode and a resistor R7, and LED indicator lamps D2 and D3 of the sound-light alarm module (4) are respectively connected with the P1.1 port and the P1.2 port of the single chip microcomputer module (1) through resistors R6 and R8.
2. The mixing tank liquid level on-line detection device of claim 1, characterized in that:
the single chip microcomputer module (1) is used for driving the ultrasonic ranging module (2) to work, receiving signals output by the ultrasonic ranging module and driving the sound-light alarm module (4) to work;
the ultrasonic ranging module (2) is used for circularly sending 40KHZ square waves and receiving echo signals reflected from the liquid level of the mixing tank and then sending a high level to the single chip microcomputer module (1);
the liquid crystal display module (3) is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module (2) to the liquid level in real time;
and the sound-light alarm module (4) is used for carrying out sound-light alarm by being driven by the singlechip module when the liquid level of the mixing box is not within a set threshold range.
3. The mixing tank liquid level on-line detection device of claim 1, characterized in that: the single chip microcomputer module (1) comprises: the circuit comprises a single chip microcomputer chip, a reset circuit, a crystal oscillator time sequence circuit and a 12V-to-5V power supply module;
the model of the single chip is STC89C51, the single chip has 40 pins and comprises 4I/O ports P0-P3 with 8 bits in parallel and a control port, the P0 comprises P0.0 to P0.7 ports, the P1 comprises P1.0 to P1.7 ports, the P2 comprises P2.0 to P2.7 ports, and the P3 comprises P3.0 to P3.7 ports, and each port can be used for input and output;
the reset circuit comprises a reset key S1, a 10uf capacitor C1, a 1K resistor R2 and a 10K resistor R1; one end of the reset key S1 is connected with one end of the resistor R2, and the other end is simultaneously connected with one end of the capacitor C1, one end of the resistor R1 and RST/VPD of the singlechip chip; the other end of the resistor R2 is connected with the other end of the capacitor C1, and the other end of the resistor R1 is grounded;
the crystal oscillator sequential circuit comprises a quartz crystal oscillator XTAL with the frequency of 12MHZ and two capacitors C2 and C3 with the frequency of 30 pf; the port 1 of the quartz crystal oscillator XTAL is connected with the XTAL1 port of the single chip, and the port 2 is connected with the XTAL2 port of the single chip; one ends of the capacitors C2 and C3 are respectively connected with the port 2 and the port 1 of the crystal oscillator, and the other ends are commonly connected with a ground end GND;
the 12V-to-5V power supply module comprises a resistor R3 of 1K, an indicator light D1, a capacitor C4 of 220uf and a capacitor C5 of 0.1 uf; one end of the resistor R3 is connected with a power supply end VCC, and the other end is connected with the display lamp D1; one end of the indicator light D1 is connected with the resistor R3, and the other end is connected with the ground end GND; the capacitors C4 and C5 are connected in parallel and then connected in parallel with the branch circuit formed by connecting R3 and D1 in series.
4. The mixing tank liquid level on-line detection device of claim 1, characterized in that: the ultrasonic ranging module (2) adopts an HY-SRF05 ultrasonic ranging module;
the ultrasonic ranging module (2) comprises five interfaces which are respectively a power interface VCC, a control end Trig, a receiving end Echo, a switching value output end OUT and a grounding end GND; the power interface VCC, the ground port GND control terminal Trig and the receiving terminal Echo are respectively connected with VCC, GND, P2.1 and P2.0 ports of the single chip module (1), and the pin of the switching value output end OUT is empty.
5. The mixing tank liquid level on-line detection device of claim 1, characterized in that: the liquid crystal display module (3) comprises an Lcd1602 liquid crystal display screen and a slide rheostat R4 and is used for displaying the liquid level of the mixing box and the distance from the ultrasonic ranging module (2) to the liquid level;
the liquid crystal display module (3) is provided with 16 ports, D0-D7 are data input and output ends, VSS and VDD are respectively a power ground and a power positive end, RS and R/W are respectively a data command selection end and a read-write selection end, VL is a liquid crystal brightness display port, BLA and BLK are respectively a backlight source positive electrode and a backlight source negative electrode, E is an enabling end, and the low level is effective; D0-D7, RS, R/W and E enable ends of the Lcd screen of the Lcd1602 are respectively connected with ports P0.0-P0.7, P2.6, P2.5 and P2.7 of a singlechip chip STC89C 51; VDD of the Lcd1602 liquid crystal display is connected with one end of a slide rheostat R4 and VCC, one end of the slide rheostat R4 is grounded, and VL of the Lcd1602 liquid crystal display is connected with a sliding end of a slide rheostat R4; BLA and BLK are connected to power supply terminal VCC and ground terminal GND, respectively.
6. The mixing tank liquid level on-line detection device of claim 1, characterized in that: the sound and light alarm module (4) comprises a green LED indicator lamp D2, a red LED indicator lamp D3, resistors R5, R6, R7, R8, a PNP pipe Q1 and a buzzer LS1, and is used for giving sound and light alarm when the liquid level of the mixing tank is higher than or lower than the numerical range of the liquid level of the mixed liquid set by the singlechip module (1);
one end of a green LED indicator lamp D2 and one end of a red LED indicator lamp D3 are connected with VCC, the other ends of the green LED indicator lamp D2 and the red LED indicator lamp D3 are respectively connected with P1.1 and P1.2 ports of the single chip microcomputer module (1) through resistors R6 and R8, an emitter of the PNP tube Q1 is connected with VCC, a collector is connected with a buzzer LS1, the other end of the buzzer LS1 is grounded through a resistor R5, and a base of the PNP tube Q1 is connected with the P1.0 port of the single chip microcomputer module (1) through a resistor R.
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| CN109540262A (en) * | 2018-12-12 | 2019-03-29 | 昆明理工大学 | A kind of mixing tank liquid level on-line measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540262A (en) * | 2018-12-12 | 2019-03-29 | 昆明理工大学 | A kind of mixing tank liquid level on-line measuring device |
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