CN214096154U - Temperature and humidity alarm control system based on single chip microcomputer - Google Patents
Temperature and humidity alarm control system based on single chip microcomputer Download PDFInfo
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- CN214096154U CN214096154U CN202023209318.0U CN202023209318U CN214096154U CN 214096154 U CN214096154 U CN 214096154U CN 202023209318 U CN202023209318 U CN 202023209318U CN 214096154 U CN214096154 U CN 214096154U
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Abstract
A temperature and humidity alarm control system based on a single chip microcomputer is provided with a temperature and humidity acquisition module, an alarm module, a single chip microcomputer module and a liquid crystal display module, wherein the temperature and humidity acquisition module, the alarm module and the liquid crystal display module are respectively connected with the single chip microcomputer module. When the temperature and humidity monitoring system is used, temperature and humidity information is collected through the temperature and humidity collection module, the temperature and humidity information is received through the single chip microcomputer module, the single chip microcomputer module converts data signals, the converted signals are transmitted to the liquid crystal display module, temperature and humidity data are displayed, meanwhile, the single chip microcomputer module sets a temperature limit value and a temperature limit value, and when the temperature and humidity data reach the limit value, the alarm module is controlled to remind a user. This humiture alarm control system based on singlechip circuit is simple, job stabilization, integrated level height, convenient operation, measurement accuracy height, does not need preparation techniques such as too much welding treatment, also can the work load that significantly reduces in the manufacturing process, makes things convenient for the preparation of system, reduces use cost.
Description
Technical Field
The utility model relates to a circuit control technical field especially relates to a humiture alarm control system based on singlechip.
Background
The temperature and the humidity are not strange in our lives, and people can see the records of the two data in many places. They are therefore also the most common basic parameters in industrial and other industrial production operations. Such as the mechanical industry, the agriculture industry, the chemical industry, the electronic industry and the like, require precise control of temperature and humidity. With the increasing living standard of people, people also begin to pay attention to their own quality of life. Since researches in recent years show that the temperature and humidity in the air also affect human health, people also begin to pay attention to the measurement and control of the temperature and humidity in daily life.
Temperature and humidity control is now a well-known area of our life research. It not only plays an important role in research, but also in agriculture and industry, two of them are factors which need to be considered. As the most common subject. Temperature and humidity have been taken into account as a whole. These two parameters are also widely used in the fields of laboratories, agriculture, soil, planting, etc. For temperature and humidity control, many machines have been produced, such as: hygrometer, hair hygrometer. Bimetallic gauges, etc. So that the measurement is performed manually. If the required effect cannot be achieved, the space is ventilated, cooled and the like manually. However, the method is time-consuming, labor-consuming, tedious to use, high in cost, difficult to achieve the desired effect, large in error, and difficult to achieve the ideal effect due to the influence of cost and operation means in the popularization and use process.
Therefore, aiming at the defects in the prior art, it is necessary to provide a temperature and humidity alarm control system based on a single chip microcomputer to overcome the defects in the prior art.
Disclosure of Invention
An object of the utility model is to avoid prior art's weak point and provide a humiture alarm control system based on singlechip, this humiture alarm control system based on singlechip system circuit is simple, job stabilization, the integrated level is high, convenient operation, measurement accuracy are high, do not need preparation techniques such as too much welding process, also can the work load that significantly reduces in the manufacturing process, make things convenient for the preparation of system, reduce use cost.
The above object of the present invention is achieved by the following technical means.
The temperature and humidity alarm control system is provided with a temperature and humidity acquisition module, an alarm module, a single chip microcomputer module and a liquid crystal display module, wherein the temperature and humidity acquisition module, the alarm module and the liquid crystal display module are respectively connected with the single chip microcomputer module.
Preferably, the temperature and humidity acquisition module is provided with a chip U2 and a resistor R1, a pin 1 of the chip U2 is connected with one end of the resistor R1, a pin 1 of the chip U2 is connected with a power VCC, a pin 2 of the chip U2 is connected with one end of the resistor R1 and the single chip microcomputer module, a pin 3 of the chip U2 is connected with a pin 4 of the chip U2, and a pin 3 of the chip U2 is grounded.
Preferably, the alarm module is provided with a buzzer H1, a diode D1, a triode Q1, a resistor R3 and a resistor R4, an emitter of the triode Q1 is connected with a power VCC, a collector of the triode Q1 is respectively connected with an anode of the buzzer H1 and a cathode of the diode D1, a base of the triode Q1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the single chip microcomputer module, a cathode of the buzzer H1 is connected with one end of the resistor R3, a cathode of the buzzer H1 is grounded, and the other end of the resistor R3 is connected with an anode of the diode D1.
Preferably, the single chip microcomputer module is provided with a chip U1, a capacitor C1, a capacitor C2, a capacitor C3, a crystal oscillator Y1, a resistor R2, a switch S1, a switch S2, a switch S3, a switch S4, an interlock switch SW1 and a slide resistor P1, a pin 1 of the chip U1 and a pin 3 of a pin 2 of the chip U1 and a pin 3 of the chip U1 are respectively connected to the liquid crystal display module, a pin 5 of the chip U1 is connected to one end of the resistor R3, a pin 6 of the chip U1 is connected to one end of the resistor R1 and a pin 2 of the chip U2, a pin 9 of the chip U1 is connected to one end of the capacitor C1, one end of the switch S4 and one end of the resistor R2, the other end of the switch S4 is connected to the other end of the capacitor C1, the other end of the switch S4 is connected to a power supply, a pin 15 of the chip U1 is connected to one end of the switch S1, a pin 16 of the chip U1 is connected to one end of the switch S1 and one end of the switch S1 is connected to one end of the chip 1 and one end of the switch S1 and one end of the chip 1 of the switch S1 and one end of the switch S1 are connected to the chip 1, One end of a crystal oscillator Y1 is connected, a pin 19 of a chip U1 is respectively connected with one end of a capacitor C3 and the other end of the crystal oscillator Y1, a pin 20 of the chip U1 is respectively connected with the other end of a capacitor C2, the other end of a capacitor C3 and the other end of a resistor R2, the pin 20 of the chip U1 is grounded, the other end of a switch S1 is respectively connected with the other end of a switch S2, the other end of a switch S3, a pin 3 of a sliding resistor P1 and a pin 2 of a sliding resistor P1, the other end of the switch S1 is grounded, a pin 1 of the sliding resistor P1 is connected with a pin 1 of an interlocking switch SW1, a pin 2 of the interlocking switch SW1 is connected with a power supply VCC, a pin 40 of the chip U1 is connected with a pin 32 of a chip U1, a pin 40 of the chip U1 is connected with the power supply VCC, the 32 pin of the chip U1, the 33 pin of the chip U1, the 34 pin of the chip U1, the 35 pin of the chip U1, the 36 pin of the chip U1, the 37 pin of the chip U1, the 38 pin of the chip U1 and the 39 pin of the chip U1 are respectively connected with the liquid crystal display module.
Preferably, the liquid crystal display module is provided with a display screen LED1 and a resistor R5, a pin 1 of the display screen LED1 is connected to one end of the resistor R5, a pin 3 of the display screen LED1 is connected to the other end of the resistor R5, a pin 1 of the display screen LED1 is grounded, a pin 2 of the display screen LED1 is connected to the power VCC, a pin 4 of the display screen LED1 is connected to a pin 1 of the chip U1, a pin 5 of the display screen LED1 is connected to a pin 2 of the chip U1, a pin 6 of the display screen LED1 is connected to a pin 3 of the chip U1, a pin 7 of the display screen LED1 is connected to a pin 39 of the chip U1, a pin 8 of the display screen LED1 is connected to a pin 38 of the chip U1, a pin 9 of the display screen LED1 is connected to a pin 37 of the chip U1, a pin 10 of the display screen LED1 is connected to a pin 36 of the chip U1, a pin 11 of the display screen LED1 is connected to a pin 35 of the chip U1, and a pin of the display screen LED1 is connected to a pin 1, and a pin of the chip U1 is connected to a pin 1 of the chip U1, and a pin of the display screen LED1 is connected to a pin 1, and a pin of the chip U1 is connected to a pin of the chip U1, and a pin of the chip U1, the pin of the display screen LED of the chip U1, the chip U1 is connected to the pin of the chip U1, the pin of the pin 1, the chip U1, the pin of the chip U1, the pin of the chip U1, the pin of the chip U1, and the pin of the pin 1, the pin of the chip U1, the pin of the chip U1, the pin of the chip U1, the pin of the LED1, the pin of the chip U1, the pin of the pin 1, the pin of the chip U1, and the pin of the pin 1, the pin of the chip U1, the pin of the pin.
Preferably, the display LED1 is arranged as 1602 lcd.
Preferably, the chip U1 is an STC89C52 single chip microcomputer.
Preferably, the chip U2 is configured as a DHT11 sensor.
Preferably, the power source VCC is 3V to 5.5V.
The utility model discloses a humiture alarm control system based on singlechip is provided with humiture collection module, alarm module, single chip module and liquid crystal display module, and humiture collection module, alarm module and liquid crystal display module are connected with single chip module respectively. When the temperature and humidity monitoring system is used, temperature and humidity information is collected through the temperature and humidity collection module, the temperature and humidity information is received through the single chip microcomputer module, the single chip microcomputer module converts data signals, the converted signals are transmitted to the liquid crystal display module, temperature and humidity data are displayed, meanwhile, the single chip microcomputer module sets a temperature limit value and a temperature limit value, and when the temperature and humidity data reach the limit value, the alarm module is controlled to remind a user. This humiture alarm control system based on singlechip circuit is simple, job stabilization, integrated level height, convenient operation, measurement accuracy height, does not need preparation techniques such as too much welding treatment, also can the work load that significantly reduces in the manufacturing process, makes things convenient for the preparation of system, reduces use cost.
Drawings
The present invention will be further described with reference to the accompanying drawings, but the contents in the drawings do not constitute any limitation to the present invention.
Fig. 1 is the utility model relates to a humiture alarm control system's system architecture schematic diagram based on singlechip.
Fig. 2 is the utility model relates to a humiture alarm control system's circuit diagram based on singlechip.
Fig. 3 is a circuit diagram of the utility model relates to a humiture alarm control system's single chip module and liquid crystal display module are connected based on the singlechip.
Fig. 4 is the utility model relates to a humiture collection module circuit diagram of humiture alarm control system based on singlechip.
In fig. 1 to 2, the method includes:
temperature and humidity acquisition module 100, alarm module 200, single chip module 300, liquid crystal display module 400.
Detailed Description
The invention will be further described with reference to the following examples.
Example 1.
A temperature and humidity alarm control system based on a single chip microcomputer is provided with a temperature and humidity acquisition module 100, an alarm module 200, a single chip microcomputer module 300 and a liquid crystal display module 400, wherein the temperature and humidity acquisition module 100, the alarm module 200 and the liquid crystal display module 400 are respectively connected with the single chip microcomputer module 300, as shown in figure 1.
Specifically, as shown in fig. 2, the temperature and humidity acquisition module 100 is provided with a chip U2 and a resistor R1, a pin 1 of the chip U2 is connected to one end of the resistor R1, a pin 1 of the chip U2 is connected to a power VCC, a pin 2 of the chip U2 is connected to one end of the resistor R1 and the single chip module 300, a pin 3 of the chip U2 is connected to a pin 4 of the chip U2, and a pin 3 of the chip U2 is grounded. Specifically, the chip U2 is provided as a DHT11 sensor. The resistor R1 is a circuit-based protection mechanism, so the resistor R1 is provided, and the resistor R1 is provided as a 5K resistor
The DHT11 sensor is an integrated sensor, has the advantages of quick response, high cost performance and the like due to the good characteristics of the DHT11 sensor, and can be directly connected when being connected with the single chip microcomputer module 300, so the DHT11 sensor is used in the design.
The DHT11 sensor is connected in a single-wire serial interface, is simple in wiring, directly outputs data signals, and is easy to use, so that the DHT11 sensor is simple to connect with the single-chip microcomputer module 300.
Specifically, the alarm module 200 is provided with a buzzer H1, a diode D1, a triode Q1, a resistor R3 and a resistor R4, an emitter of the triode Q1 is connected to the VCC, a collector of the triode Q1 is connected to an anode of the buzzer H1 and a cathode of the diode D1, a base of the triode Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the single chip microcomputer module 300, a cathode of the buzzer H1 is connected to one end of the resistor R3, a cathode of the buzzer H1 is grounded, and the other end of the resistor R3 is connected to an anode of the diode D1.
Specifically, the single chip module 300 includes a chip U, a capacitor C, a crystal oscillator Y, a resistor R, a switch S, a ganged switch SW, and a sliding resistor P, wherein pins 1 of the chip U and pins 3 of the chip U2 are respectively connected to the liquid crystal display module 400, pins 5 of the chip U are connected to one end of the resistor R, pins 6 of the chip U are respectively connected to one end of the resistor R and pins 2 of the chip U, pins 9 of the chip U are respectively connected to one end of the capacitor C, one end of the switch S, and one end of the resistor R, the other end of the switch S is connected to the other end of the capacitor C, the other end of the switch S is connected to a power source VCC, pins 15 of the chip U are connected to one end of the switch S, pins 16 of the chip U are connected to one end of the switch S, pins 17 of the chip U are connected to one end of the switch S, pins 18 of the chip U are respectively connected to one end of the capacitor C, and the switch S, One end of a crystal oscillator Y1 is connected, a pin 19 of a chip U1 is respectively connected with one end of a capacitor C3 and the other end of the crystal oscillator Y1, a pin 20 of the chip U1 is respectively connected with the other end of a capacitor C2, the other end of a capacitor C3 and the other end of a resistor R2, the pin 20 of the chip U1 is grounded, the other end of a switch S1 is respectively connected with the other end of a switch S2, the other end of a switch S3, a pin 3 of a sliding resistor P1 and a pin 2 of a sliding resistor P1, the other end of the switch S1 is grounded, a pin 1 of the sliding resistor P1 is connected with a pin 1 of an interlocking switch SW1, a pin 2 of the interlocking switch SW1 is connected with a power supply VCC, a pin 40 of the chip U1 is connected with a pin 32 of a chip U1, a pin 40 of the chip U1 is connected with the power supply VCC, the 32 pin of the chip U1, the 33 pin of the chip U1, the 34 pin of the chip U1, the 35 pin of the chip U1, the 36 pin of the chip U1, the 37 pin of the chip U1, the 38 pin of the chip U1, and the 39 pin of the chip U1 are connected to the liquid crystal display module 400, respectively.
Specifically, the chip U1 is set as an STC89C52 single chip microcomputer. The STC89C52 single chip microcomputer is a chip commonly used for system control in electronic research, has good effects on aspects of intelligent instruments, industrial control systems and mechanical and electrical integration design, and is also commonly used as a control chip of a temperature and humidity control system. The STC89C52 single chip microcomputer can realize the effect of designing medium temperature and humidity control, and the cost performance is higher than that of other single chip microcomputers, so the design adopts the STC89C52 single chip microcomputer.
The pin 6 of the chip U1 is a P2.0 port of the singlechip for receiving data of the chip U2 sensor and converting the received data from the port.
The STC89C52 single chip microcomputer controls the whole circuit system to work, converted signals are transmitted to the temperature and humidity acquisition module 100, the alarm module 200 and the liquid crystal display module 400 through various interfaces, and the four templates can form an integral system to realize the collection and display of temperature and humidity data. The alarm template is mainly characterized in that a buzzer H1 is directly connected to an STC89C52 single chip microcomputer, and through self limit setting of a user, when the temperature and the humidity reach the limit value, the buzzer H1 gives an alarm. When the device is used, the linked switch SW1 is used for starting or closing the whole system, realizing the switching function of an input power supply, and simultaneously carrying out limit value data setting through the key switch S1, the switch S2 and the switch S3.
The key is pressed as a reset protection function by the key switch S4, and the entire system can be reactivated by activating the switch S4 when a problem occurs in the system.
Specifically, the liquid crystal display module 400 is provided with a display LED1 and a resistor R5, a pin 1 of the display LED1 is connected to one end of the resistor R5, a pin 3 of the display LED1 is connected to the other end of the resistor R5, a pin 1 of the display LED1 is grounded, a pin 2 of the display LED1 is connected to the power VCC, a pin 4 of the display LED1 is connected to a pin 1 of the chip U1, a pin 5 of the display LED1 is connected to a pin 2 of the chip U1, a pin 6 of the display LED1 is connected to a pin 3 of the chip U1, a pin 7 of the display LED1 is connected to a pin 39 of the chip U1, a pin 8 of the display LED1 is connected to a pin 38 of the chip U1, a pin 9 of the display LED1 is connected to a pin 37 of the chip U1, a pin 10 of the display LED1 is connected to a pin 36 of the chip U1, a pin 11 of the display LED1 is connected to a pin 35 of the chip U1, a pin of the display LED1 is connected to a pin of the chip U1, and a pin of the display LED1 is connected to a pin 1 of the chip U1, and a pin of the display LED1 is connected to the chip U1, and a pin of the display LED1 is connected to the display LED1 of the chip U1, and a pin of the chip U1, the pin of the display LED1, the display LED1 is connected to the pin of the chip U1, and the pin of the chip U1, the chip U1 is connected to the pin of the chip U1, the pin of the chip U1, and the chip U1, the pin of the chip U1 is connected to the pin of the chip U1, and the pin of the chip U1, and the pin of the chip U1, the pin of the chip U1, the pin of the chip U1, the chip U1 is connected to the chip U1, the pin of the chip U1, and the pin of the chip U1, the pin of the chip. Because the system integrates various connected templates, each template can be directly connected into the single chip microcomputer to work. The display screen LED1 only needs to be directly connected to the single chip microcomputer, and the STC89C52 single chip microcomputer can display data on the display screen LED1 after outputting the data.
Specifically, the display LED1 is provided as 1602 lcd. And after receiving the data of the STC89C52 single chip microcomputer, the 1602 liquid crystal display displays the data of the current environment temperature and humidity.
Specifically, the power source VCC is 3V to 5.5V. The power supply is 5V in this example.
This humiture alarm control system based on singlechip of implementing is provided with humiture collection module, alarm module, single chip module and liquid crystal display module, and humiture collection module, alarm module and liquid crystal display module are connected with single chip module respectively. When the temperature and humidity monitoring system is used, temperature and humidity information is collected through the temperature and humidity collection module, the temperature and humidity information is received through the single chip microcomputer module, the single chip microcomputer module converts data signals, the converted signals are transmitted to the liquid crystal display module, temperature and humidity data are displayed, meanwhile, the single chip microcomputer module sets a temperature limit value and a temperature limit value, and when the temperature and humidity data reach the limit value, the alarm module is controlled to remind a user. This humiture alarm control system based on singlechip circuit is simple, job stabilization, integrated level height, convenient operation, measurement accuracy height, does not need preparation techniques such as too much welding treatment, also can the work load that significantly reduces in the manufacturing process, makes things convenient for the preparation of system, reduces use cost.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a humiture alarm control system based on singlechip which characterized in that: the temperature and humidity monitoring system is provided with a temperature and humidity acquisition module, an alarm module, a single chip microcomputer module and a liquid crystal display module, wherein the temperature and humidity acquisition module, the alarm module and the liquid crystal display module are respectively connected with the single chip microcomputer module;
the temperature and humidity acquisition module is provided with chip U2 and resistance R1, and 1 foot of chip U2 is connected with resistance R1's one end respectively, and chip U2's 1 foot is connected the power VCC, and chip U2's 2 feet are connected with resistance R1's one end, single chip module respectively, and chip U2's 3 feet are connected with chip U2's 4 feet, and chip U2's 3 feet ground connection.
2. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 1, characterized in that: the alarm module is provided with buzzer H1, diode D1, triode Q1, resistance R3 and resistance R4, the power VCC is connected to triode Q1's projecting pole, triode Q1's collecting electrode is connected with buzzer H1's positive pole, diode D1's negative pole respectively, triode Q1's base is connected with resistance R3's one end, resistance R3's the other end is connected with the single chip microcomputer module, buzzer H1's negative pole and resistance R3's one end are connected, buzzer H1's negative pole ground connection, resistance R3's the other end and diode D1's positive pole are connected.
3. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 2, characterized in that: the single chip microcomputer module is provided with a chip U1, a capacitor C1, a capacitor C2, a capacitor C3, a crystal oscillator Y1, a resistor R2, a switch S1, a switch S2, a switch S3, a switch S4, an interlocking switch SW1 and a sliding resistor P1, wherein a pin 1 of the chip U1 and a pin 3 of a pin 2 of the chip U1 and a pin 2 of the chip U1 are respectively connected with the liquid crystal display module, a pin 5 of the chip U1 is connected with one end of the resistor R3, a pin 6 of the chip U1 is respectively connected with one end of the resistor R1 and a pin 2 of the chip U2, a pin 9 of the chip U1 is respectively connected with one end of the capacitor C1, one end of the switch S4 and one end of the resistor R2, the other end of the switch S4 is connected with the other end of the capacitor C1, the other end of the switch S4 is connected with a power supply VCC, a pin 15 of the chip U1 is connected with one end of the switch S1, a pin 16 of the chip U1 is connected with one end of the switch S1, and one end of the switch S1 is connected with the pin 1 of the switch S1 and one end of the chip U1 is connected with the switch S1, One end of a crystal oscillator Y1 is connected, a pin 19 of a chip U1 is respectively connected with one end of a capacitor C3 and the other end of the crystal oscillator Y1, a pin 20 of the chip U1 is respectively connected with the other end of a capacitor C2, the other end of a capacitor C3 and the other end of a resistor R2, the pin 20 of the chip U1 is grounded, the other end of a switch S1 is respectively connected with the other end of a switch S2, the other end of a switch S3, a pin 3 of a sliding resistor P1 and a pin 2 of a sliding resistor P1, the other end of the switch S1 is grounded, a pin 1 of the sliding resistor P1 is connected with a pin 1 of an interlocking switch SW1, a pin 2 of the interlocking switch SW1 is connected with a power supply VCC, a pin 40 of the chip U1 is connected with a pin 32 of a chip U1, a pin 40 of the chip U1 is connected with the power supply VCC, the 32 pin of the chip U1, the 33 pin of the chip U1, the 34 pin of the chip U1, the 35 pin of the chip U1, the 36 pin of the chip U1, the 37 pin of the chip U1, the 38 pin of the chip U1 and the 39 pin of the chip U1 are respectively connected with the liquid crystal display module.
4. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 3, wherein: the liquid crystal display module is provided with a display screen LED1 and a resistor R5, a pin 1 of the display screen LED1 is connected with one end of a resistor R5, a pin 3 of the display screen LED1 is connected with the other end of a resistor R5, a pin 1 of the display screen LED1 is grounded, a pin 2 of the display screen LED1 is connected with a power supply VCC, a pin 4 of the display screen LED1 is connected with a pin 1 of the chip U1, a pin 5 of the display screen LED1 is connected with a pin 2 of the chip U1, a pin 6 of the display screen LED1 is connected with a pin 3 of the chip U1, a pin 7 of the display screen LED1 is connected with a pin 39 of the chip U1, a pin 8 of the display screen LED1 is connected with a pin 38 of the chip U1, a pin 9 of the display screen LED1 is connected with a pin 37 of the chip U1, a pin 10 of the display screen LED1 is connected with a pin 36 of the chip U1, a pin 11 of the display screen LED 72 is connected with a pin 35 of the chip U1, a pin 12 of the display screen LED 72 is connected with a pin 1, and a pin 1 of the chip U1 is connected with a pin 1 of the chip U1, and a pin of the chip U1, the chip U1 is connected with a pin of the chip U1, and a pin of the chip U1, the chip.
5. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 4, wherein: the display LED1 is provided 1602 liquid crystal display.
6. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 5, wherein: the chip U1 is set as STC89C52 singlechip.
7. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 6, wherein: the chip U2 is provided as a DHT11 sensor.
8. The temperature and humidity alarm control system based on the single chip microcomputer according to claim 7, wherein: the power supply VCC is 3V-5.5V.
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| CN202023209318.0U CN214096154U (en) | 2020-12-28 | 2020-12-28 | Temperature and humidity alarm control system based on single chip microcomputer |
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