| dc.description.abstract | Real-time monitoring of environmental parameters in greenhouses is crucial to support optimal plant growth. This study aims to design a prototype IoT- based system for monitoring air temperature, water temperature, air humidity (RH), and water pH using the NodeMCU ESP8266. The sensors used include DHT22 for air temperature and humidity, DS18B20 for water temperature, and PH-4502C for pH. Data is displayed on an LCD 16x2, transmitted to the Blynk IoT application, and automatically recorded in Google Sheets. Testing was conducted over two days by comparing sensor readings with conventional instruments such as thermometers, thermohygrometers, and pH meters. Results showed that the DHT22 sensor achieved air temperature accuracy of 95.02% and humidity accuracy of 97.38% on the first day, and 94.02% and 97.01% on the second day. The DS18B20 sensor reached water temperature accuracy of 94.54% and 98.59%, while the pH sensor showed accuracies of 89.11% and 86.54%, respectively. Graphical visualization showed fluctuation patterns that followed the trend of the reference tools. The system proved capable of accurately and responsively monitoring environmental conditions and has potential for implementation in small-scale greenhouses and precision agriculture development. | en_US |
