Abstract

The role of fresh fruit and vegetables respiration rate is a main postharvest handling. This research designed an internet of things (IoT) respirometer to measure respiration activities of fruit and vegetables. The respirometer consisted oxygen (O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>), carbondioxide (CO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>) and humidity sensors, microcontroller, esp32, nextion display and respiration chamber. Sensors node generate data and processed by NodeMCU esp32 and the respiration data transferred by internet network and cloud database. The O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> sensor interfenece was less 0.1%, CO2 sensor accuracy ±70 ppm of reading, SHT-30 accuracy ±2% and temperature ±0.3°C. The respirometer based IoT system provides a real-time measurement and good fit data measurement that was tested for oyster mushroom storage.

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