Eureka! Institutional Repository

In this thesis, the study, design and construction of an integrated device that measures soil components is carried out. The work consists of surveying ground measurement methods and selecting a commercially available sensor based on the TDR measurement. The construction of the measuring device prototype, the wireless transfer of the data via LoRa to an ESP32 receiver. The heart of the device is the STM32H750 microcontroller, where it communicates with the NEO-6M GPS to obtain the geographic position, communicates via RS485 with the measuring sensor and via SPI with the LoRa SX1276 chip. The measurement values are transferred via the receiver to the computer via USB communication. The computer runs the main high-level application script in python language. This script receives the data via USB, stores it in a MySQL database and sends it via Websockets to a web application locally on the computer. This web app is a map developed based on Google's API and contains all measurements and their geographic locations placed like markers. Experiments are conducted for the proper functioning of the sensor and the conclusions drawn are analyzed as well as ways to improve the device and software for further development