| Abstrakt: |
Soil temperature is part of the important weather parameters to be observed, especially in the field of agro-climatology. In BMKG (Indonesian Meteorology, Climatology, and Geophysics Agency), the measurement of soil temperature parameters still uses conventional tools. With advances in technology, digital measuring instruments are now being developed to measure soil temperature. This study aims to determine the performance specifications and design specifications of the soil temperature measuring instrument with a smartphone display based on the Internet of Things. In this study, the sensor used is DHT11, the microcontroller used is NodeMCU ESP8266, and supporting components such as switches, pushbuttons, and adapters. The tools used are a multimeter, smartphone, portable Wifi, ThingSpeak, App Inventor, and Arduino IDE software. The results of the study are in the form of a soil temperature measuring device that can be accessed easily by everyone using a real-time smartphone, minimalist in size and does not require a large amount of power. Measurements were carried out at BMKG by comparing measuring instruments with standard measuring instruments, in this study data was taken for 1 hour with data collection once every 5 minutes, 5 DHT 11 sensors and 5 soil thermometers were used as standard tools, so that the results on sensor A were averaged The average error is 1.8%, on sensor B the average error is 1.78%, on sensor C the average error is 1.15%, on sensor D the average error is 2.19%, and on sensor E the average is average error 0.76%. It can be concluded that the measurements made using DHT11 are very accurate by considering the sensor specifications which have a measurement tolerance of 2°C. [ABSTRACT FROM AUTHOR] |
