IIC_serial port expansion board

1. Research significance:
On March 21, 2022, China Eastern Airlines passenger plane MU5735 crashed in Teng County, Wuzhou, Guangxi. After six days of full-scale search and rescue, the National Emergency Response Command confirmed that all 123 passengers and 9 crew members were killed. The whole country mourned. This incident was an extremely sad air crash for the country. With the development of the economy and the improvement of technological level, the world's transportation network has become more complete, people's travel has become more convenient, and time has been greatly shortened. But on the basis of all this, safety is the most important. This air crash made people cry. Nowadays, thermal imaging cameras and life detectors are mostly used in search and rescue operations to conduct surface searches. In this air crash, no one survived, and it was difficult for thermal imaging cameras and life detectors to search for the victims. In order to assist search and rescue personnel in efficient search and rescue after the accident and give an explanation to the families of the victims, this work is designed and implemented for outdoor search and rescue in view of the shortcomings of the above situations. For example, in the crash of China Eastern Airlines passenger plane MU5735, a targeted design was designed It is a portable short-distance wireless communication device and has the following functions: GPS and Beidou dual-mode positioning function, wireless single-point dialogue and broadcast distress information function, personnel heart rate and body temperature measurement function, and environmental temperature and humidity detection function. It can be used on mobile networks It can transmit information offline and can also work in areas without network, providing an efficient search and rescue method for search and rescue personnel.
 
2. Research method:
Using the STM32 minimum system board c8t6 as the controller, the temperature sensor is used to realize the body temperature measurement function and the environmental temperature and humidity detection function. The heart rate sensor realizes the personnel heart rate measurement function. ATGM336H realizes the positioning function, self-made control function and host computer terminal. For short-distance wireless communication systems, have an in-depth understanding of the principles of related technologies, independently design corresponding processor peripheral circuits and host computer terminal programs, and write codes for debugging until the system can meet practical requirements.
 
3. Main content:
1. The main body of the device captures the body status information and environmental information of the person holding it
(1) The detection of body status information is implemented by the MAX30102 heart rate and blood oxygen sensor module, and the detection data is transmitted to STM32 for heart rate and blood oxygen calculation.
(2) The detection of environmental information is implemented by the DHT11 temperature and humidity sensor module, which is responsible for detecting environmental conditions.
2. The device is configured with GPS and Beidou dual-mode positioning systems to obtain the location information of the person holding it
(1) Use the ATGM336H module and GPS module to implement the GPS and Beidou dual-mode positioning systems to detect the environmental location.
3. The equipment can transmit data and communicate with the holder through the communication device
(1) The mobile phone communication module is responsible for the network information transmission, which can realize real-time communication with the holder.
(2) Wireless data transmission is responsible for the transmission of information without a network, allowing the body status information and environmental location information to be uploaded to the host computer without a network.