CN201583353U - A temperature and humidity meter based on MSP430 microcontroller - Google Patents

Abstract

The utility model relates to a temperature and humidity meter based on an MSP430F149 single-chip microcomputer. Existing measuring instruments are bulky, and the mechanical parts are not compatible with the electronic control equipment. The utility model comprises a control module, a temperature module, a humidity module, an RS232 communication module, an RS485 communication module, an alarm module, a power supply module and a power supply voltage measurement module. The temperature module and the humidity module are respectively connected to the A/D sampling port signal in the control module, the RS232 communication module and the RS485 communication module are respectively connected to the general asynchronous serial interface signal in the control module; the alarm module and the power supply voltage measurement module are respectively connected to the control module Central I/O port signal connection; the power supply module supplies power for the control module, temperature module, humidity module, RS232 communication module, RS485 communication module and power voltage measurement module. The utility model has low power consumption, high precision and can receive analog and digital signals.

Description

A temperature and humidity meter based on MSP430 microcontroller

technical field

The utility model belongs to the field of measurement and sensing, in particular to a temperature and humidity meter based on an MSP430 single-chip microcomputer.

Background technique

Temperature and humidity are closely related to people's life and industrial production, and we need to know the exact value of both in many occasions. How to measure them accurately and conveniently, many methods have been proposed, such as mercury thermometers for measuring body temperature, alcohol thermometers, kerosene thermometers for room temperature, thermocouples for industrial sites, and infrared non-contact for measuring high temperatures. Temperature measurement technology, temperature measurement technology based on color CCD three primary colors and laser temperature measurement technology. The above-mentioned temperature measurement technologies have their own advantages and disadvantages. As far as the temperature measurement technologies commonly used in life are concerned, mercury thermometers are the most widely used and convenient, but they are generally only used for body temperature measurement, manual reading is required, and the data cannot be uploaded automatically. In recent years, the temperature sensor technology has developed rapidly, and electronic thermometers based on single-chip technology have already appeared on the market. This instrument can directly display the measured value, can be powered by batteries, and the data can be connected to the host computer through the interface, which can be used for data collection and analysis.

Another example is the method of measuring humidity with hair hygrometer, psychrometer, chilled mirror dew point meter and so on. Most of the instruments for measuring humidity above adopt the classic principle of humidity sensing. Due to their large size and mechanical parts, they are not compatible with electronic control equipment. Although they are still used in some fields, they are not enough to meet the development of modern science and technology, especially for humidity. control needs. With the development of science and technology, it has been found that the electrical properties of certain materials have a certain relationship with the change of humidity in the air, and these materials can be used to make humidity sensors. It is suitable for the field of automatic control, mainly including resistive, capacitive, and photoelectric, and other uncommon ones include surface acoustic wave, microwave, diode, infrared, and so on. Especially the capacitive humidity sensor, which uses the approximate linear relationship between the change of the capacitance value of some materials and the change of the ambient humidity to measure the humidity. Some large companies even integrate specific circuits into the sensor to make it output a linear voltage signal, which is converted into a digital signal through A/D, and then after a certain mathematical change, the humidity value can be displayed conveniently.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model proposes a temperature and humidity meter based on MSP430F149 single-chip microcomputer, which is suitable for temperature measurement at normal temperature.

A temperature and humidity meter based on MSP430F149 single-chip microcomputer includes a control module, a temperature module, a humidity module, an RS232 communication module, an RS485 communication module, an alarm module, a power supply module and a power supply voltage measurement module.

The temperature module and the humidity module are respectively connected to the A/D sampling port signal in the control module, the RS232 communication module and the RS485 communication module are respectively connected to the universal asynchronous serial interface (UART) signal in the control module; the alarm module and the power supply voltage measurement module are respectively It is connected with the I/O port signal in the control module; the power supply module supplies power for the control module, temperature module, humidity module, RS232 communication module, RS485 communication module and power voltage measurement module.

The main features of the utility model are low power consumption, automatic charging, high precision, and the ability to receive both analog and digital signals. Low power consumption is achieved by using TI's ultra-low power consumption series MCU MSP460F149. With software design, the instrument can be in a dormant state when it is not working. When the instrument is connected to the host computer through the DB9 port, it can automatically switch to the host computer power supply mode, and can also charge the battery, prolonging the battery life.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, a temperature and humidity meter based on MSP430F149 single-chip microcomputer includes control module 1, temperature module 2, humidity module 3, RS232 communication module 4, RS485 communication module 5, alarm module 6, power module 7 and power supply voltage measurement module 8.

The temperature module 2 and the humidity module 3 are respectively connected with the A/D sampling port signal in the control module 1, and the RS232 communication module 4 and the RS485 communication module 5 are respectively connected with the universal asynchronous serial interface (UART) signal in the control module 1; the alarm module 6 and the power supply voltage measurement module 8 are respectively connected to the I/O port signal in the control module 1; the power supply module 7 is the control module 1, the temperature module 2, the humidity module 3, the RS232 communication module 4, the RS485 communication module 5 and the power supply voltage measurement module 8 power supply.

The utility model adopts MSP430F149 single-chip microcomputer as the control chip to coordinate the work of each part of the instrument. The receiving of the sensor signal adopts the amplifying circuit with a bridge, and the A/D conversion uses the 12-bit A/D inside the MSP430F149. The battery is used for power supply. When connected to the host computer, it can be converted to the host computer for power supply and charge the battery. RS232/RS485 two communication methods are adopted, and the two communication methods share a DB9 port, and the specific communication method is automatically identified. The reception of analog or digital signals is achieved through the soldering combination of several zero-ohm resistors. Expand the external FLASH memory to store historical data and upload it to the host computer. The utility model has a battery voltage detection function. The display in the embodiment adopts LED digital tubes, and the software disk provides a human-computer interaction interface.

Claims (1)

1. a temperature and humidity meter based on MSP430 single-chip microcomputer, comprising control module, temperature module, humidity module, RS232 communication module, RS485 communication module, alarm module, power supply module and supply voltage measurement module; It is characterized in that: The temperature module and the humidity module are respectively connected to the A/D sampling port signal in the control module, the RS232 communication module and the RS485 communication module are respectively connected to the general asynchronous serial interface signal in the control module; the alarm module and the power supply voltage measurement module are respectively connected to the control module Central I/O port signal connection; the power supply module supplies power for the control module, temperature module, humidity module, RS232 communication module, RS485 communication module and power voltage measurement module.

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