Course design: Intelligent epidemic prevention access control system

Course design: Intelligent epidemic prevention management access control system
Reference: [Graduation design] Intelligent epidemic prevention access control based on STM32 - Jiali Chuang EDA open source hardware platform (oshwhub.com)
Goal: Complete the course design
1. Background and significance of the topic
After the beginning and development of the epidemic, China is currently in the normalized management of the epidemic. Under the normalized management of the epidemic, people's daily travel is always inseparable from temperature measurement, pass certificates, etc.
In view of the current epidemic situation, we design an intelligent epidemic prevention access control management system. It can realize the unmanned temperature measurement during people's travel and the regional entry and exit management of the system.
2. Requirements and analysis of the topic
2.1 Requirements for the topic design
Intelligent epidemic prevention access control management system.
1. The system can collect the body temperature of people entering and leaving, record the flow of people,
2. It can display the body temperature, status, flow of people, etc. on the screen.
3. The voice broadcast prompts whether the body temperature of people entering and leaving is normal, and the servo action (equivalent to opening the gate).
4. The background records the body temperature and flow of people entering and leaving. Remind the background staff to report and handle.
2.2 Topic Design Analysis
The design and implementation of the intelligent epidemic prevention access control management system. The modules included in the design mainly include:
LCD display circuit, voice broadcast circuit, non-contact temperature sensor circuit, servo drive circuit, Internet of Things module, key circuit module and power supply module.
The early warning of the epidemic is realized through the cooperation between the modules. Once there is an abnormal temperature, the gate will be closed and the voice broadcast and background reminder will be used to notify the relevant personnel to take relevant measures.
For the requirements of the topic, we use:
stm32f103c8t6 real-time acquisition infrared sensor to obtain temperature. When the temperature is lower than or higher than the specified threshold, the TFT display screen is operated to display the abnormal temperature and the voice module broadcasts. At the same time, the servo is controlled to close, the gate is simulated to be closed, and the temperature information is uploaded to the background through the WIFI module to remind the background staff to report and process.
The difficulty of the system design lies in the use of stm32 microcontroller program design, LCD display, voice broadcast module and non-contact temperature measurement module.
3. Design Overview3.1
Physical Design
Overview3.1.1 Overall Design Block
 
Diagram3.1.2 Hardware Design Schematic Diagram and Explanation of Main Parts1
. Use stm32f103c8t6 as the main control module1.
  
Collect infrared sensor to obtain temperature2
. Operate TFT display to display temperature, status, and flow of people.3.
Control voice module broadcast, servo switch (simulate gate closed state)
4. Upload temperature information to the background through wifi
module3.1.2 MLX90614ESF-BCC module-non-contact temperature sensor1
        
. Internally equipped with ambient temperature compensation and linear calibration algorithm2
. Data exchange with single-chip microcomputer through IIC communication3
. The module has very high accuracy and can meet the requirements of non-contact temperature measurement function (this project uses 10cm accuracy).
3.1.3 ESP12F series module - ESP8266
   
1. Low power consumption UART-WiFi chip module
2. Convenient secondary development, access to cloud services, and realize global control of mobile phone 3/4G anytime, anywhere
3. Support standard IEEE802.11 b/g/n protocol, complete TCP/IP protocol stack
4. Use this module to upload data, and upload data to the background server in real time for data storage and big data processing.
3.1.4 LCD display - 1.8-inch 128X160 pixel TFT screen
     
1. Communicate with the microcontroller through the SPI serial port to display the measured temperature or other necessary information.
2. Support 16BIT RGB 65K color display, rich display colors.
3. Military-grade process standards, long-term stable operation, and provide underlying driver technology support
4. Display temperature, status, traffic flow and other information.
3.1.5 Voice playback - SV 17F voice broadcast module
    
1. Support l0 trigger playback function, 8 l0 ports trigger 8 tracks or 8 10 ports group
2. Support MP3, WAV decoding format.
3. 24-bit DAC output, dynamic range supports 90DB, signal-to-noise ratio supports 85DB.
4. Comes with 5WD class amplifier, can directly drive 4Q, 3.5W speakers.
Overall design schematics Physical finished
 
product
 
3.1.3 Software design and code debugging instructions
Program reference "[Wildfire] STM32 HAL library development practical guide - based on F103 series development board" based on HAL library using STM32CubeMx generated. At the same time, we also refer to the Melexis MLX90614 infrared temperature sensor data sheet
 
 
 
 
 
 
 
 
 
 
3.2 Key technologies and algorithms
3.2.1 Communication protocol
Serial communication protocol:
IIC communication protocol:
SPI communication protocol:
3.2.2 CRC-8 (PEC) verification principle and implementation
 
3.2.3 MLX90614ESF-DCC temperature algorithm research
 
3.2.4 MLX90614ESF-DCC usage research
 
3.3 Physical display and description