CN111273580A

CN111273580A - STM 32-based intelligent energy-saving control switch system

Info

Publication number: CN111273580A
Application number: CN202010062061.6A
Authority: CN
Inventors: 韩轲; 王君怡; 汪颖; 马家奇; 冯硕; 李�瑞; 梁俊峰; 姜明泽
Original assignee: Harbin University of Commerce
Current assignee: Harbin University of Commerce
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-06-12
Anticipated expiration: 2040-01-19
Also published as: CN111273580B

Abstract

The invention discloses an intelligent energy-saving control switch system based on STM32, belongs to the field of automatic control, and aims to solve the problem of energy waste in the power utilization of the existing classroom. The invention comprises a micro control unit MCU, an ultrasonic sensor, a servo motor and a relay; the micro control unit MCU controls the servo motor to drive the ultrasonic sensor to rotate, and the distances between the ultrasonic sensor and the N points are measured respectively in the rotating process; according to someone can cause ultrasonic sensor measuring distance to diminish in the time, when the actual range finding of a certain point is less than the threshold value of corresponding point, current count value X of micro control unit MCU's counter module adds 1, the whole back of accomplishing of range finding of N point, judge whether X is greater than 10, if yes then judge someone in the classroom, if otherwise judge nobody in the classroom as the judgement result does not have someone in the classroom, micro control unit MCU passes through relay disconnection power, realizes the intelligence outage. The invention is used for automatically powering off the unmanned classroom.

Description

STM 32-based intelligent energy-saving control switch system

Technical Field

The invention relates to an intelligent energy-saving control switch based on STM32, and belongs to the field of automatic control.

Background

Along with the development of the education cause of China, the extension of classrooms, the lighting requirements of the classrooms of colleges and universities are more and more large, the power load of the classrooms is continuously increased, at present, the use of most of the classrooms in the colleges and universities in China is in a free state, namely, the classrooms are freely controlled by students entering the classrooms, and the use of the classrooms is not scientifically and reasonably managed due to the lack of the use of the classrooms, so that the effective utilization rate of electrical equipment in the clas:

1. after students finish self-study at night, the students often forget to turn off electric lamps in the classroom, so that the phenomenon of ever-standing is caused;

2. after the teachers and students finish the class or the study in summer, the teachers and the students often forget to turn off the fans in the classroom.

In order to realize energy-saving control of classroom electricity consumption, a counter arranged at a doorway is adopted at present to count the number of people entering and exiting a classroom, so that the number of people staying in the classroom is calculated, and a certain number of illuminating lamps are turned on through the number of people staying in the classroom to realize the purpose of energy conservation. However, in the actual application process, when two or more people enter and exit simultaneously, statistical errors are easy to occur; moreover, students entering a classroom are most likely not to study themselves in the same area, which causes the number of lighting to be inconsistent with the actual use.

Also have the controller that adopts infrared human body to detect, through the infrared image in the periodically scanning classroom, and then judge the number of people and the position in the classroom, come the light of lighting on the corresponding position, reach the purpose of furthest energy-conserving again when guaranteeing the illumination. However, the infrared human body detection control part is expensive, and the analyzed result is easily inconsistent with the reality, so that the control of the illuminating lamp is wrong.

Disclosure of Invention

The invention aims to solve the problem of energy waste in the electricity utilization of the existing classroom and provides an intelligent energy-saving control switch system based on STM 32.

The invention relates to an intelligent energy-saving control switch system based on STM32, which comprises a micro control unit MCU, an ultrasonic sensor, a servo motor and a relay;

selecting a horizontal plane higher than a given distance of a table and a chair in a classroom, and installing an aiming point device at an intersection line of the horizontal plane and a side wall, wherein the aiming point device comprises a servo motor and an ultrasonic sensor arranged on the servo motor, and the servo motor drives the ultrasonic sensor to rotate at a set frequency;

selecting N points at the intersection line of the horizontal plane and one side wall, wherein N is more than 10, respectively measuring the distance between the ultrasonic sensor and the N points when no person exists in a classroom, and respectively taking the measured value of each point as the threshold value of the point;

the micro control unit MCU controls the servo motor to drive the ultrasonic sensor to rotate, and the distances between the ultrasonic sensor and the N points are measured respectively in the rotating process; according to the fact that the distance measured by the ultrasonic sensor is reduced when a person is in the classroom, when the actual distance measurement of a certain point is smaller than the threshold value of the corresponding point, the current count value X of the counter module of the micro control unit MCU is added with 1, after the distance measurement of N points is completed, whether X is larger than 10 is judged, if yes, the person in the classroom is judged, and if not, no person in the classroom is judged;

and when the judgment result shows that no person exists in the classroom, the micro control unit MCU disconnects the power supply through the relay, so that intelligent power off is realized.

Preferably, the micro control unit MCU adopts STM32F103RCT 6;

a PD0 port of the micro-control unit MCU is simultaneously connected with one end of a resistor R6, one end of a crystal oscillator Y1 and one end of a capacitor C1, a PD1 port of the micro-control unit MCU is simultaneously connected with the other end of a resistor R6, the other end of a crystal oscillator Y1 and one end of a capacitor C4, and the other end of the capacitor C1 and the other end of the capacitor C4 are simultaneously connected with GND;

the NRST port of the micro control unit MCU is simultaneously connected with one end of a resistor R5, one end of a KEY switch KEY1 and one end of a capacitor C2, the other end of the resistor R5 is connected with VCC, and the other end of the KEY switch KEY1 and the other end of the capacitor C2 are simultaneously connected with GND;

the VDDA port of the micro control unit MCU is simultaneously connected with one end of a resistor R8 and one end of a capacitor C8, the other end of the resistor R8 is connected with VCC, and the other end of the capacitor C8 is connected with GND;

the BOOT0 port of the micro control unit MCU is connected with one end of a resistor R10, the other end of the resistor R10 is connected with the No. 2 pin of a Header3, the No. 1 pin of the Header3 is connected with GND, and the No. 3pin of the Header3 is connected with VCC.

Preferably, the ultrasonic sensor J25 adopts US-100;

the servo motor J26 adopts a 9g steering engine;

the No. 2 pin of the ultrasonic sensor J25 is connected with the A1 port of the micro control unit MCU, and the No. 3pin and the No. 4 pin are simultaneously connected with VCC;

a pin 3 of the servo motor J26 is connected with a port B0 of the micro control unit MCU, and a pin 2 is connected with VCC;

pin 1 of the ultrasonic sensor J25 is connected to pin 1 of the servomotor J26.

Preferably, the relay RE21 adopts SRD-12 VDC-SL-C;

the port A6 of the micro control unit MCU is connected with one end of a resistor R22, the other end of the resistor R22 is connected with the base of a triode Q1, the emitter of the triode Q1 is grounded, the collector of a triode Q1 is simultaneously connected with one end of a resistor R21, the anode of a diode D31 and the pin No. 4 of a relay RE21, the other end of a resistor R21 is connected with the cathode of a light emitting diode LED1, the anode of the light emitting diode LED1, the cathode of the diode D31 and the pin No. 1 of the relay RE21 are simultaneously connected with VCC, and the pin No. 2, pin No. 3 and pin No. 5 of the relay RE21 are respectively connected with the pin No. 1, pin No. 2 and pin No. 3.

Preferably, the specific method for measuring the distance between the N points by the ultrasonic sensor is as follows:

the transmitter of the ultrasonic sensor transmits ultrasonic waves, the receiver of the ultrasonic sensor receives the reflected ultrasonic waves, and the ultrasonic sensor multiplies the speed of the ultrasonic waves according to the time difference between the transmitted ultrasonic waves and the reflected ultrasonic waves to obtain the distance of a certain point.

Preferably, N points are selected on the horizontal plane, and N is 180.

The invention has the advantages that: the intelligent energy-saving control switch system based on STM32 provided by the invention can realize the collection and statistics of the number of people in a classroom by adopting a scheme with low price, simplicity and convenience, and achieves the purpose of automatically powering off an electric appliance when no people exist in the classroom. The power supply is cut off through the relay, and damage to the electric appliance is avoided. The intelligent classroom power management system can improve the intellectualization of classroom power management, liberate human resources, improve the service efficiency of electric energy, and realize the intelligent accurate control to the classroom of colleges and universities.

Drawings

FIG. 1 is a schematic block diagram of an intelligent energy-saving control switch system based on STM32 according to the invention;

FIG. 2 is a schematic circuit diagram of the MCU and its peripheral circuits according to the present invention;

FIG. 3 is a schematic circuit diagram of an ultrasonic sensor according to the present invention;

FIG. 4 is a schematic circuit diagram of the servo motor of the present invention;

fig. 5 is a circuit schematic of the relay of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1 to fig. 5, and the intelligent energy-saving control switch system based on STM32 in the present embodiment includes a micro control unit MCU, an ultrasonic sensor, a servo motor, and a relay;

In the present embodiment, the ultrasonic sensor is a sensor that converts an ultrasonic signal into an electric signal. Ultrasonic waves are mechanical waves with a vibration frequency higher than 20 kHz. It has the features of high frequency, short wavelength, less diffraction, high directivity, directional propagation, etc. The penetration of ultrasonic waves into liquids and solids is great, especially in sunlight-opaque solids. Ultrasonic waves hitting impurities or interfaces can generate significant reflection to form reflection echoes, and hitting moving objects can generate Doppler effect.

Further, the micro control unit MCU adopts STM32F103RCT 6;

In this embodiment, the Header3 is a 3Pin connector.

Still further, the ultrasonic sensor J25 adopts US-100;

the servo motor J26 adopts a 9g steering engine;

pin 1 of the ultrasonic sensor J25 is connected to pin 1 of the servomotor J26.

In the present embodiment, the ultrasonic sensor US-100 is used with a measurement accuracy of 0.1cm and a measurement range of 0.08 to 8 m.

In the embodiment, the servo motor adopts a 9g steering engine, and the 9g steering engine is a position or angle servo driver and is suitable for a control system which needs to constantly change and can keep the angle.

Still further, the relay RE21 adopts an SRD-12 VDC-SL-C;

Still further, the specific method for measuring the distance between the N points by the ultrasonic sensor is as follows:

In this embodiment, a commonly used ultrasonic sensor is composed of a piezoelectric wafer, and can transmit or receive ultrasonic waves.

Still further, N points are selected on the horizontal plane, and N is 180.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. An intelligent energy-saving control switch system based on STM32 is characterized by comprising a micro control unit MCU, an ultrasonic sensor, a servo motor and a relay;

2. An intelligent energy-saving control switch system based on STM32 according to claim 1, wherein the micro control unit MCU employs STM32F103RCT 6;

3. An intelligent energy-saving control switch system based on STM32 according to claim 2, wherein the ultrasonic sensor J25 is US-100;

the servo motor J26 adopts a 9g steering engine;

pin 1 of the ultrasonic sensor J25 is connected to pin 1 of the servomotor J26.

4. An intelligent energy-saving control switch system based on STM32 according to claim 3, wherein the relay RE21 is SRD-12 VDC-SL-C;

5. An intelligent energy-saving control switch system based on STM32 according to any one of claims 1-4, wherein the specific method for measuring the distance between the N points by the ultrasonic sensor is as follows:

6. An intelligent energy-saving control switch system based on STM32 according to any one of claims 1-4, wherein N points are selected on the horizontal plane, and N is 180.