Real-Time IoT Monitoring System for Green Roof Microclimate in Tropical Region

Will be presented at Friday, 23 May 2025, 10.00 (GMT +7)

Abstract

Green roofs are increasingly adopted in tropical urban areas for their environmental benefits, but real-time monitoring of their performance remains complicated and costly. This study introduces a low-cost, IoT-based monitoring system designed to measure soil temperature, air temperature, and ratio humidity on a green roof. Using DS18B20 and DHT22 sensors integrated with an ESP32 microcontroller, the system transmits data to Google Sheets and the Blynk platform at 15-minute intervals. Sensor calibration showed strong accuracy, with R² values above 0.98. Over a 7-day trial, DS18B20 sensors maintained a 100% data success rate, while DHT22 sensors achieved 96.8% for temperature and 54.8% for humidity. The system showed minimal response delays—mostly under 3 seconds—caused primarily by internet stability rather than sensor count. The lowest recorded soil temperature was found in moss rose (Portulaca grandiflora) media, highlighting plant influence on microclimate. These findings demonstrate that affordable, IoT-enabled monitoring can support better management and evaluation of green roof systems in tropical climates.