CN204902881U - Humiture measurement system based on singlechip - Google Patents

Abstract

The utility model discloses a temperature and humidity measurement system based on a single-chip microcomputer, comprising: a micro-control module, a transmission module, a power supply module, a temperature sensor, a humidity sensor, a display module, buttons, a serial port communication module and an alarm module; the micro-control module is connected to a power supply A module, a display module, a button, a serial port communication module and an alarm module; a temperature sensor and a humidity sensor are connected to the micro control module through the transmission module. A temperature and humidity measurement system based on a single-chip microcomputer provided by the utility model is controlled by a STC89C52RC single-chip microcomputer, and measures temperature and humidity through a temperature and humidity sensor. The liquid crystal display of the liquid crystal screen is used for temperature and humidity, and contains a temperature and humidity control system alarm function. The system is reliable and cost-effective.

Description

A Temperature and Humidity Measurement System Based on SCM

technical field

The utility model belongs to the field of greenhouse monitoring, in particular to a temperature and humidity measurement system based on a single-chip microcomputer.

Background technique

In recent years, with the development of agriculture in our country, the development of greenhouses has become a very important aspect. Domestic greenhouses are developing rapidly and the area is increasing by 1-1.5 million hectares every year. In order to make crops grow better, we need to adjust environmental factors to improve product quality. Since our research on greenhouses started at a later stage, greenhouse technology is at a relatively low level. Coupled with insufficient management, and the monitoring conditions of the greenhouse environment also need to be improved, improving technology has become an important aspect. Therefore, there is a necessity for the temperature and humidity controller to appear.

In the research of temperature and humidity measurement technology, compared with domestic, foreign countries developed earlier. Initially, analog instruments were used in a wide range, including information collection and then control. The distributed control system technology began to rise in the late 1980s. Due to the wide range of temperature control technology used in the world, the development is also particularly rapid. In many countries, the scope of control is not limited to the scope of control automation, but is developing towards a more open beam, so as to achieve complete automation. , unmanned. Since our country started relatively late in this field, it is still at a relatively backward level in this technology. Since developed countries have a better technical level in this field one step ahead, Chinese technicians are intensively studying their technology. In the process of this study, Chinese technicians have mastered the temperature indoor microcomputer control technology, but this technology also has limitations, and can only be used in a single temperature and humidity environment. In terms of technology, single-chip microcomputers can control more parameters and single-loop systems, but in terms of overall control, there is still a large distance from developed countries.

Utility model content

One of the purposes of the utility model is to provide a temperature and humidity measurement system based on a single-chip microcomputer with low energy consumption and strong scalability to solve the problems in the prior art.

The utility model provides a temperature and humidity measurement system based on a single-chip microcomputer, comprising: a micro-control module, a transmission module, a power supply module, a temperature sensor, a humidity sensor, a display module, buttons, a serial port communication module and an alarm module; the micro-control module is connected to The power supply module, display module, buttons, serial port communication module and alarm module; the temperature sensor and humidity sensor are connected to the micro control module through the transmission module.

Further, the alarm module includes a buzzer and an indicator light.

Further, the micro-control module adopts STC89C52RC single-chip microcomputer.

Further, the temperature sensor is a DS18B20 temperature sensor; the humidity sensor is a DHT11 digital temperature and humidity sensor.

Further, the display module adopts LCD1602 display screen, and the LCD1602 display screen is a dot-matrix liquid crystal module, which can display 16*2 characters at the same time.

Further, the buttons include button 1, button 2, button 3 and button 4, wherein:

Button 1: Set the temperature gate value plus;

Button 2: Set the temperature threshold value minus;

Button 3: set the humidity threshold plus;

Button 4: Decrease the clock humidity gate value. The beneficial effect of the utility model is that the temperature and humidity measurement system based on the single-chip microcomputer provided by the utility model adopts the STC89C52RC single-chip microcomputer as the control, and measures the temperature and humidity through the temperature and humidity sensor, and the liquid crystal display of the liquid crystal screen is used for temperature and humidity , and contains an alarm function for the temperature and humidity control system. The system is reliable and cost-effective.

Description of drawings

Fig. 1 shows a block diagram of a temperature and humidity measurement system based on a single-chip microcomputer of the present invention.

Detailed ways

Specific embodiments of the present utility model will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

As shown in Figure 1, the utility model provides a temperature and humidity measurement system based on a single-chip microcomputer, including: a micro-control module 1, a transmission module 2, a power module 3, a temperature sensor 4, a humidity sensor 5, a display module 6, buttons 7, Serial port communication module 10 and alarm module; micro-control module 1 is connected to power supply module 3, display module 6, key 7, serial port communication module 10 and alarm module; temperature sensor 4 and humidity sensor 5 are connected to micro-control module 1 through transmission module 2, And the power supply module 3 of this system preferably has a +5V power supply voltage.

Further, the alarm module includes a buzzer 9 and an indicator light 8; the buzzer 9 is preferably a THDZ buzzer with a rated operating voltage of 12V and a rated current of 25mA.

Further, the micro-control module 1 adopts STC89C52RC single-chip microcomputer. STC89C52RC MCU is fully compatible in instruction system and pins; with 8K byte program memory; fully static operation, working range: 0Hz～24Hz; three-level program memory encryption; (1024+128)×8 bits; internal RAM; 32 bits ; Bidirectional input and output lines; two sixteen-bit timers/counters; a full-duplex asynchronous serial port; strong anti-interference ability: high anti-static, 2KV/4KV fast pulse interference; wide temperature range, -40℃～ 85°C; disable ALE output; ultra-low power consumption: 1. Power-down mode: typical power consumption <0.1μA; 2. Idle mode: typical power consumption 2mA; 3. Normal working mode: typical power consumption 4mA～7mA.

Further, the temperature sensor 4 is a DS18B20 temperature sensor; it has high integration, ultra-small, high-precision digital functions. The DS18B20 digital temperature sensor can directly convert the measured temperature into a serial digital signal, and then send it to the microcontroller. The characteristics of DS18B20 different from other temperature sensors are: the interface mode is a single-bus interface, and one interface line can meet the requirements of DS18B20 to connect with the single-chip microcomputer. After connecting with the single-chip microcomputer, the communication between them is bidirectional; no external components are required. In DS18B20; the temperature measurement range is -55°C to +125°C, and the inherent temperature measurement resolution is 0.5°C. In the range of -10°C to +85°C, the accuracy can reach ±0.5°C, which meets the design requirements; the measurement results are serial It is transmitted, and it is transmitted in 9-bit digital quantity; the user can set the alarm temperature; it can be powered by the data line.

The humidity sensor 5 is a DHT11 digital temperature and humidity sensor. The DHT11 digital temperature and humidity sensor is a temperature and humidity sensor with a calibrated output. It contains a thermistor and an NTC humidity measuring device inside and is connected to an 8-bit microprocessor to realize external Precise measurement of temperature and humidity. And it has the advantages of fast response, strong anti-interference, and output calibration. The communication is a single bus serial interface with small size.

Further, the display module 6 adopts an LCD1602 display screen, which is a dot-matrix liquid crystal module and can display 16*2 characters at the same time.

Further, the buttons 7 include button one K1, button two K2, button three K3 and button four K4, wherein:

Button one K1: set the temperature threshold plus;

Button 2 K2: Set the temperature threshold value to decrease;

Button three K3: set the humidity threshold plus;

Button 4 K4: decrease the clock humidity gate value.

The utility model provides a temperature and humidity measurement system based on a single-chip microcomputer, which is controlled by a STC89C52RC single-chip microcomputer, and measures temperature and humidity through a temperature and humidity sensor. The liquid crystal display of the liquid crystal screen is used for temperature and humidity, and contains a temperature and humidity control system alarm function. The system is reliable and cost-effective.

Although some embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be taken as limiting the scope of rights of the present utility model.

Claims (6)

1. a temperature and humidity measurement system based on single-chip microcomputer, it is characterized in that, comprising: micro-control module, transmission module, power supply module, temperature sensor, humidity sensor, display module, button, serial port communication module and alarm module; Described micro-control The module is connected to the power supply module, display module, buttons, serial port communication module and alarm module; the temperature sensor and humidity sensor are connected to the micro control module through the transmission module. 2. A kind of temperature and humidity measuring system based on single-chip microcomputer as claimed in claim 1, is characterized in that, described alarm module comprises buzzer and indicator light. 3. A kind of temperature and humidity measurement system based on single-chip microcomputer as claimed in claim 1, is characterized in that, described micro control module adopts STC89C52RC single-chip microcomputer. 4. A kind of temperature and humidity measuring system based on single-chip microcomputer as claimed in claim 1, is characterized in that, described temperature sensor is DS18B20 type temperature sensor; Described humidity sensor is DHT11 digital temperature and humidity sensor. 5. A kind of temperature and humidity measurement system based on single-chip microcomputer as claimed in claim 1, is characterized in that, described display module adopts LCD1602 display screen, and described LCD1602 display screen is dot-matrix liquid crystal module, can display 16*2 simultaneously character. 6. A kind of temperature and humidity measurement system based on single-chip microcomputer as claimed in claim 1, is characterized in that, described key comprises key one, key two, key three and key four, wherein: Button 1: Set the temperature gate value plus; Button 2: Set the temperature threshold value minus; Button 3: set the humidity threshold plus; Button 4: Decrease the clock humidity gate value.