Design of Temperature Monitoring System of Fresh Product Self-collection Cabinet Based on LoRa

For the delivery within the fresh food industry, it is difficult to coordinate the courier and customer pickup time, and the customer cannot pick up the goods in time. Especially in the summer or winter temperature extremes in the environment of fresh food more prone to spoilage. A LoRa-based wireless temperature control cabinet monitoring system is designed to solve this problem. The system incorporates various IoT technologies and consists of a terminal controller, sensors, actuation units and a host computer. This design uses STM32F407 microprocessor as the core to monitor the temperature inside the cabinet in real time and control the electric heating film and semiconductor cooler for temperature control through PID algorithm. The monitoring terminal receives the temperature through the LoRa sensor and visualizes it. It is also possible to set the temperature you want to achieve in the host computer. The test results show that the system achieves real-time monitoring of the fresh cabinet with stable data transmission and has good prospects.