CN103630258A - Multichannel wireless temperature detection system - Google Patents
Multichannel wireless temperature detection system Download PDFInfo
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- CN103630258A CN103630258A CN201210305338.9A CN201210305338A CN103630258A CN 103630258 A CN103630258 A CN 103630258A CN 201210305338 A CN201210305338 A CN 201210305338A CN 103630258 A CN103630258 A CN 103630258A
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Abstract
The invention discloses a multichannel wireless temperature detection system which comprises a number of inferior temperature acquisition terminal systems. The inferior temperature acquisition terminal systems are linked with a host through a main set link radio frequency transceiver nRF24L01. The host is connected with a PC through a chip MAX3232. The multichannel wireless temperature detection system provided by the invention has the advantages that the device has the advantages of simple structure and low cost; multipoint temperature detection can be carried out; and the wireless temperature detection system can realize remote control and low power consumption and real time wireless temperature detection.
Description
Technical field
The present invention relates to industrial temperature collection, specifically refer to multiple wireless system for detecting temperature.
Background technology
Temperature is being played the part of extremely important role in mankind's daily life, and in industrial and agricultural production process, temperature detection tool is of great significance simultaneously.Present stage, temperature detection was mainly that wired set point temperature detects, and its temperature detection principle is that single-chip microcomputer utilizes temperature sensor detected temperatures, and shows at charactron or the enterprising trip temperature of LCD.Because system does not have warning function, therefore need to artificially judge whether to heat up or to lower the temperature, this makes the detection of system lose real-time simultaneously.In addition, in the severe industrial environment of some environment, with manual type direct control, instrument measurement temperature is set also unrealistic, therefore adopts wireless mode to carry out particularly necessity of temperature detection.
Summary of the invention
The object of the present invention is to provide multiple wireless system for detecting temperature, this apparatus structure is simple, and cost is low, can carry out multi-point temp detection, be the wireless temperature detection system that can realize Long-distance Control, it is maximum feature of the present invention that the wireless temperature of low-power consumption, real-time detects.
Implementation of the present invention is as follows: multiple wireless system for detecting temperature, comprise some the next temperature acquisition terminal systems, the next temperature acquisition terminal system is connected to host computer by main collection link radio-frequency (RF) transceiver nRF24L01 chain, and described host computer is connected with PC by chip MAX3232.
The monolithic radio frequency transceiver nRF24L01 that described the next temperature acquisition terminal system comprises slave computer and is connected with slave computer, described slave computer mainly consists of single-chip microcomputer and the power supply being connected with single-chip microcomputer and reset circuit, key circuit, liquid crystal display circuit, thermosensitive resistor and circuit NTC, described monolithic radio frequency transceiver nRF24L01 is connected with single-chip microcomputer, and described monolithic radio frequency transceiver nRF24L01 also links radio-frequency (RF) transceiver nRF24L01 with main collection and links.
Comprising of described monolithic radio frequency transceiver nRF24L01 occurs or receptive pattern selection port CE, SPI sheet selects port CSN, SPI clock port SCLK, SPI slave data-in port MOSI, SPI slave data-out port MISO, maskable interrupts output port IRQ, described single-chip microcomputer comprises general purpose I/O interface, its I/O interface comprises P0.0 port, P0.1 port, P0.2 port, P0.3 port, P0.4 port, P0.5 port, described generation or receptive pattern select port CE to be connected with P0.0 port, SPI sheet selects port CSN to be connected with P0.1 port, SPI clock port SCLK is connected with P0.2 port, SPI slave data-in port MOSI is connected with P0.3 port, SPI slave data-out port MISO is connected with P0.4 port, maskable interrupts output port IRQ is connected with P0.5 port.
Described thermosensitive resistor and circuit NTC comprises that the thermistor R1NTC, resistance R 3, the adjustable resistance R2 that are connected in successively power Vcc form, described adjustable resistance R2 ground connection, and the link of described thermistor R1NTC and resistance R 3 draws Uo voltage output end, described Uo voltage output end is connected with single-chip microcomputer.
Described single-chip microcomputer is that model is the single-chip microcomputer of MSP430F149.
Implementation procedure of the present invention is: test macro integral body is divided into the next temperature acquisition terminal system, host computer and PC three parts.PC is the superiors of whole system, is responsible for the control and management to the next temperature acquisition terminal system, and the data of each node of collecting are carried out to Storage and Processing.Because the next temperature acquisition terminal system cannot directly be communicated by letter with PC, this just need to use host computer as intermediary.Host computer is communicated by letter by wireless module with the next temperature acquisition terminal system, and host computer and PC adopt wired connection.
This design adopts MSP430F149 single-chip microcomputer as kernel control module, and its main feature is low-power consumption.MSP430F149 has the feature of two serial ports, while utilizing one of them serial port and PC to carry out communication, and between the two must be by RS-232 level transferring chip.When single-chip microcomputer and monolithic radio frequency transceiver nRF24L01 communication, can pass through the communication of universaling I/O port simulative serial port.The collection of scene temperature data be utilize thermistor R1NTC and MSP430F149 single-chip microcomputer portion with 12 A/D converters realize.Here do not need additional ADC, can simplify circuit, improve the stability of system.Using key circuit as load module, be used for changing the bound of temperature alarming.Because designing requirement does not need the demonstration of too many content, consider power consumption and cost performance, can make a simple and easy segment encode liquid crystal by oneself for showing.
NRF24L01 is a new single chip radio-frequency receiving-transmitting device, works in 2.4～2.5 GHz ISM band.The functional modules such as built-in frequency synthesizer, power amplifier, crystal oscillator, modulator, and merged enhancement mode ShockBurSt technology, wherein output power and communication channel can be configured by program.NRF24L01 is low in energy consumption, has multiple low-power working mode (power-down mode and idle pulley) to make energy-saving design more convenient.
From monolithic processor controlled angle, only nRF24L016 need to be control and data signal with controller general I/O mouth and be connected, , comprising of described monolithic radio frequency transceiver nRF24L01 occurs or receptive pattern selection port CE, SPI sheet selects port CSN, SPI clock port SCLK, SPI slave data-in port MOSI, SPI slave data-out port MISO, maskable interrupts output port IRQ, described single-chip microcomputer comprises general purpose I/O interface, its I/O interface comprises P0.0 port, P0.1 port, P0.2 port, P0.3 port, P0.4 port, P0.5 port, described generation or receptive pattern select port CE to be connected with P0.0 port, SPI sheet selects port CSN to be connected with P0.1 port, SPI clock port SCLK is connected with P0.2 port, SPI slave data-in port MOSI is connected with P0.3 port, SPI slave data-out port MISO is connected with P0.4 port, maskable interrupts output port IRQ is connected with P0.5 port.
In order to make the power consumption of whole system lower, the thermistor R1NTC of employing low-power consumption and 12 A/D converters that MSP430149 inside carries are realized the acquisition function of temperature.Relation between its theoretical analysis and calculated resistance value and temperature variation is as shown in following formula (1):
In formula (1): RT is temperature T (unit: the resistance of the thermistor R1NTC in the time of K); RN is rated temperature TN (unit: the NTC thermistor resistance in the time of K); T is set point of temperature (unit: K); B is the material constant of NTC thermistor, is again heat sensitive index.In normal temperature environment, temperature is 28 ℃, and being converted into Kelvin temperature is 273.15+28=301.15 K.By repeatedly surveying the data under 28 ℃ and 30 ℃ of environment, as shown in table 1, average, reduce error as far as possible, calculate to obtain B value.
Through type (1) can obtain, and by T, TN changes into kelvin degree and calculates B=4 064.34.Through relatively finding, the resistance of trying to achieve is very close with the resistance recording.
Thermistor R1NTC, resistance R 3 is 200 k Ω resistance, the range of adjustment of adjustable resistance R2 is 0～20 k Ω, is used for adjusting the accuracy of thermometer.Uo voltage output end is the voltage detecting, and Uo Voltage-output is terminated to single-chip microcomputer pin, by A/D, changes, and converts the magnitude of voltage obtaining to temperature value, on liquid crystal display circuit, shows.
This design adopts homemade 16 segment encode liquid crystal to show.Utilize liquid crystal drive IC (HT1621) and supporting liquid crystal LCD glass sheet, make 16 segment encode liquid crystal by oneself.In addition, the buzzing driving circuit of two kinds of frequencies is housed in drive IC, can realizes warning function.In temperature acquisition process, because system needs the Temperature numerical collecting to show by the VC interface on PC at any time, therefore need between PC and single-chip microcomputer, intercom mutually.Because the RS-232 level of PC is different from the Transistor-Transistor Logic level of single-chip microcomputer, therefore with MAX3232 chip, realize the mutual conversion of level, so just can realize the intercommunication mutually between single-chip microcomputer and PC.The next temperature acquisition terminal system utilizes Interruption to send temperature data, utilizes port to interrupt the bound that set temperature is reported to the police, and under the state of other times in low-power consumption mode 3, can greatly reduce power consumption like this.Host computer utilizes receive interruption to receive data, and utilizes MAX3232 to communicate by letter with PC.
At present some design can realize wireless temperature acquisition, but power consumption too high be its maximum shortcoming.In actual temperature control procedure, both require system to there is stability, real-time, and needed again to make system power dissipation low and guarantee the homogeneity of temperature therefore to design a kind of multipoint wireless system for detecting temperature of low-power consumption highly significant.Propose a kind of multipoint wireless temperature measurement system that adopts low-power scm MSP430F149 chip microcontroller herein, solved the problems referred to above.This system can realize the detection to temperature intelligent, can carry out multi-point temp detection simultaneously, is the wireless temperature detection system that can realize Long-distance Control.It is the maximum feature of this design that the wireless temperature of low-power consumption, real-time detects.
The invention has the advantages that: this apparatus structure is simple, and cost is low, can carry out multi-point temp detection, is the wireless temperature detection system that can realize Long-distance Control, and it is maximum feature of the present invention that the wireless temperature of low-power consumption, real-time detects.
Accompanying drawing explanation
The structural representation of the next temperature acquisition terminal system of Fig. 1.
Fig. 2 is the electrical block diagram of monolithic radio frequency transceiver nRF24L01.
Fig. 3 is the electrical block diagram of thermosensitive resistor and circuit NTC.
Fig. 4 is structural representation of the present invention.
Embodiment
Embodiment mono-
As shown in Figure 1,2,3, 4.
Multiple wireless system for detecting temperature, comprises some the next temperature acquisition terminal systems, and the next temperature acquisition terminal system is connected to host computer by main collection link radio-frequency (RF) transceiver nRF24L01 chain, and described host computer is connected with PC by chip MAX3232.
The monolithic radio frequency transceiver nRF24L01 that described the next temperature acquisition terminal system comprises slave computer and is connected with slave computer, described slave computer mainly consists of single-chip microcomputer and the power supply being connected with single-chip microcomputer and reset circuit, key circuit, liquid crystal display circuit, thermosensitive resistor and circuit NTC, described monolithic radio frequency transceiver nRF24L01 is connected with single-chip microcomputer, and described monolithic radio frequency transceiver nRF24L01 also links radio-frequency (RF) transceiver nRF24L01 with main collection and links.
Comprising of described monolithic radio frequency transceiver nRF24L01 occurs or receptive pattern selection port CE, SPI sheet selects port CSN, SPI clock port SCLK, SPI slave data-in port MOSI, SPI slave data-out port MISO, maskable interrupts output port IRQ, described single-chip microcomputer comprises general purpose I/O interface, its I/O interface comprises P0.0 port, P0.1 port, P0.2 port, P0.3 port, P0.4 port, P0.5 port, described generation or receptive pattern select port CE to be connected with P0.0 port, SPI sheet selects port CSN to be connected with P0.1 port, SPI clock port SCLK is connected with P0.2 port, SPI slave data-in port MOSI is connected with P0.3 port, SPI slave data-out port MISO is connected with P0.4 port, maskable interrupts output port IRQ is connected with P0.5 port.
Described thermosensitive resistor and circuit NTC comprises that the thermistor R1NTC, resistance R 3, the adjustable resistance R2 that are connected in successively power Vcc form, described adjustable resistance R2 ground connection, and the link of described thermistor R1NTC and resistance R 3 draws Uo voltage output end, described Uo voltage output end is connected with single-chip microcomputer.
Described single-chip microcomputer is that model is the single-chip microcomputer of MSP430F149.
Implementation procedure of the present invention is: test macro integral body is divided into the next temperature acquisition terminal system, host computer and PC three parts.PC is the superiors of whole system, is responsible for the control and management to the next temperature acquisition terminal system, and the data of each node of collecting are carried out to Storage and Processing.Because the next temperature acquisition terminal system cannot directly be communicated by letter with PC, this just need to use host computer as intermediary.Host computer is communicated by letter by wireless module with the next temperature acquisition terminal system, and host computer and PC adopt wired connection.
This design adopts MSP430F149 single-chip microcomputer as kernel control module, and its main feature is low-power consumption.MSP430F149 has the feature of two serial ports, while utilizing one of them serial port and PC to carry out communication, and between the two must be by RS-232 level transferring chip.When single-chip microcomputer and monolithic radio frequency transceiver nRF24L01 communication, can pass through the communication of universaling I/O port simulative serial port.The collection of scene temperature data be utilize thermistor R1NTC and MSP430F149 single-chip microcomputer portion with 12 A/D converters realize.Here do not need additional ADC, can simplify circuit, improve the stability of system.Using key circuit as load module, be used for changing the bound of temperature alarming.Because designing requirement does not need the demonstration of too many content, consider power consumption and cost performance, can make a simple and easy segment encode liquid crystal by oneself for showing.
NRF24L01 is a new single chip radio-frequency receiving-transmitting device, works in 2.4～2.5 GHz ISM band.The functional modules such as built-in frequency synthesizer, power amplifier, crystal oscillator, modulator, and merged enhancement mode ShockBurSt technology, wherein output power and communication channel can be configured by program.NRF24L01 is low in energy consumption, has multiple low-power working mode (power-down mode and idle pulley) to make energy-saving design more convenient.
From monolithic processor controlled angle, only nRF24L016 need to be control and data signal with controller general I/O mouth and be connected, , comprising of described monolithic radio frequency transceiver nRF24L01 occurs or receptive pattern selection port CE, SPI sheet selects port CSN, SPI clock port SCLK, SPI slave data-in port MOSI, SPI slave data-out port MISO, maskable interrupts output port IRQ, described single-chip microcomputer comprises general purpose I/O interface, its I/O interface comprises P0.0 port, P0.1 port, P0.2 port, P0.3 port, P0.4 port, P0.5 port, described generation or receptive pattern select port CE to be connected with P0.0 port, SPI sheet selects port CSN to be connected with P0.1 port, SPI clock port SCLK is connected with P0.2 port, SPI slave data-in port MOSI is connected with P0.3 port, SPI slave data-out port MISO is connected with P0.4 port, maskable interrupts output port IRQ is connected with P0.5 port.
In order to make the power consumption of whole system lower, the thermistor R1NTC of employing low-power consumption and 12 A/D converters that MSP430149 inside carries are realized the acquisition function of temperature.Relation between its theoretical analysis and calculated resistance value and temperature variation is as shown in following formula (1):
In formula (1): RT is temperature T (unit: the resistance of the thermistor R1NTC in the time of K); RN is rated temperature TN (unit: the NTC thermistor resistance in the time of K); T is set point of temperature (unit: K); B is the material constant of NTC thermistor, is again heat sensitive index.In normal temperature environment, temperature is 28 ℃, and being converted into Kelvin temperature is 273.15+28=301.15 K.By repeatedly surveying the data under 28 ℃ and 30 ℃ of environment, as shown in table 1 below, average, reduce error as far as possible, calculate to obtain B value.
Through type (1) can obtain, and by T, TN changes into kelvin degree and calculates B=4 064.34.Through relatively finding, the resistance of trying to achieve is very close with the resistance recording.
Thermistor R1NTC, resistance R 3 is 200 k Ω resistance, the range of adjustment of adjustable resistance R2 is 0～20 k Ω, is used for adjusting the accuracy of thermometer.Uo voltage output end is the voltage detecting, and Uo Voltage-output is terminated to single-chip microcomputer pin, by A/D, changes, and converts the magnitude of voltage obtaining to temperature value, on liquid crystal display circuit, shows.
This design adopts homemade 16 segment encode liquid crystal to show.Utilize liquid crystal drive IC (HT1621) and supporting liquid crystal LCD glass sheet, make 16 segment encode liquid crystal by oneself.In addition, the buzzing driving circuit of two kinds of frequencies is housed in drive IC, can realizes warning function.In temperature acquisition process, because system needs the Temperature numerical collecting to show by the VC interface on PC at any time, therefore need between PC and single-chip microcomputer, intercom mutually.Because the RS-232 level of PC is different from the Transistor-Transistor Logic level of single-chip microcomputer, therefore with MAX3232 chip, realize the mutual conversion of level, so just can realize the intercommunication mutually between single-chip microcomputer and PC.The next temperature acquisition terminal system utilizes Interruption to send temperature data, utilizes port to interrupt the bound that set temperature is reported to the police, and under the state of other times in low-power consumption mode 3, can greatly reduce power consumption like this.Host computer utilizes receive interruption to receive data, and utilizes MAX3232 to communicate by letter with PC.
At present some design can realize wireless temperature acquisition, but power consumption too high be its maximum shortcoming.In actual temperature control procedure, both require system to there is stability, real-time, and needed again to make system power dissipation low and guarantee the homogeneity of temperature therefore to design a kind of multipoint wireless system for detecting temperature of low-power consumption highly significant.Propose a kind of multipoint wireless temperature measurement system that adopts low-power scm MSP430F149 chip microcontroller herein, solved the problems referred to above.This system can realize the detection to temperature intelligent, can carry out multi-point temp detection simultaneously, is the wireless temperature detection system that can realize Long-distance Control.It is the maximum feature of this design that the wireless temperature of low-power consumption, real-time detects.
As mentioned above, can well realize the present invention.
Claims (5)
1. multiple wireless system for detecting temperature, it is characterized in that: comprise some the next temperature acquisition terminal systems, the next temperature acquisition terminal system is connected to host computer by main collection link radio-frequency (RF) transceiver nRF24L01 chain, and described host computer is connected with PC by chip MAX3232.
2. multiple wireless system for detecting temperature according to claim 1, it is characterized in that: the monolithic radio frequency transceiver nRF24L01 that described the next temperature acquisition terminal system comprises slave computer and is connected with slave computer, described slave computer mainly consists of single-chip microcomputer and the power supply being connected with single-chip microcomputer and reset circuit, key circuit, liquid crystal display circuit, thermosensitive resistor and circuit NTC, described monolithic radio frequency transceiver nRF24L01 is connected with single-chip microcomputer, and described monolithic radio frequency transceiver nRF24L01 also links radio-frequency (RF) transceiver nRF24L01 with main collection and links.
3. multiple wireless system for detecting temperature according to claim 2, it is characterized in that: comprising of described monolithic radio frequency transceiver nRF24L01 occurs or receptive pattern selection port CE, SPI sheet selects port CSN, SPI clock port SCLK, SPI slave data-in port MOSI, SPI slave data-out port MISO, maskable interrupts output port IRQ, described single-chip microcomputer comprises general purpose I/O interface, its I/O interface comprises P0.0 port, P0.1 port, P0.2 port, P0.3 port, P0.4 port, P0.5 port, described generation or receptive pattern select port CE to be connected with P0.0 port, SPI sheet selects port CSN to be connected with P0.1 port, SPI clock port SCLK is connected with P0.2 port, SPI slave data-in port MOSI is connected with P0.3 port, SPI slave data-out port MISO is connected with P0.4 port, maskable interrupts output port IRQ is connected with P0.5 port.
4. multiple wireless system for detecting temperature according to claim 2, it is characterized in that: described thermosensitive resistor and circuit NTC comprises that the thermistor R1NTC, resistance R 3, the adjustable resistance R2 that are connected in successively power Vcc form, described adjustable resistance R2 ground connection, and the link of described thermistor R1NTC and resistance R 3 draws Uo voltage output end, described Uo voltage output end is connected with single-chip microcomputer.
5. according to the multiple wireless system for detecting temperature described in any one in claim 2-4, it is characterized in that: described single-chip microcomputer is that model is the single-chip microcomputer of MSP430F149.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016201667A1 (en) * | 2015-06-18 | 2016-12-22 | 张甘霖 | Intelligent thermometer |
| CN106875648A (en) * | 2015-12-10 | 2017-06-20 | 哈尔滨黑石科技有限公司 | A kind of milk cow health data collecting system |
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Application publication date: 20140312 |