Air nutrisi pada reservoir hidroponik rakit apung berfungsi untuk memenuhi kebutuhan nutrsi tanaman hidroponik. Sirkulasi yang terus menerus selama 24 jam menyebabkan ketinggian air berkurang akibat proses evaporasi pada tanaman, mengakibatkan air reservoir berkurang tiap harinya. Penelitian dilakukan dengan merancang alat monitoring ketinggian air dan nutrisi tanaman kangkung (Ipomea reptans) pada hidroponik rakit apung melalui aplikasi telegram. Sensor Ultrasonik HC-SR04 sebagai pembaca level air dan Sensor TDS DFRobot TDS nutrisi serta relay 2 channel sebagai on-off otomatis pompa air dan nutrisi. Bot telegram API melalui botfather disinkronkan dengan nodeMCU-ESP32 sehingga dapat dikontrol melalui sistem internet of things (IoT). Telegram dapat menerima dan meminta informasi tinggi air, TDS, status pompa, menghidupkan dan mematikan pompa air serta nutrisi. Pompa air “on” pada ketinggian kurang dari 15 cm dan pompa “off” pada ketinggian di atas 20 cm, sedangkan untuk pompa nutrisi “on” pada nilai TDS kurang dari 500 ppm dan “off” pada nilai TDS di atas 1000 ppm. Pada pengujian sensor ultrasonik didapatkan error 0%, sedangkan pada pengujian sensor TDS didapat error 0-0,4 % dan 0-0,5%. Tanaman kangkung hidroponik rakit apung pada umur 30 HST mencapai rata-rata tinggi tanaman 52,63 cm dan bobot total basar sebesar 31,25 gram. Kata Kunci: floating, hidroponik, IoT, kangkung, telegram
Farm cultivation in the highlands is constrained by the long rainy season, less efficient sunlight and susceptible to pests and diseases. One of the solutions in cayenne pepper cultivation is using hydroponics and greenhouse s to minimize pests and diseases that come from the soil and are carried by the wind. The purpose of this research is to produce "SMART-IGHIOT" a control system based on the Internet of Things using Dutch bucket hydroponics in a portable greenhouse. The technology applied is in the form of monitoring and controlling temperature, humidity, air temperature and light intensity using sensors integrated with the ESP32 microcontroller. The ESP32 is connected to the Thingspeak webserver to display sensor measurement results in real-time. The design of the monitoring system for light intensity, temperature and humidity in the greenhouse can be maximized so that environmental conditions can be optimized. The performance of using greenhouse s can maximize the intensity of sunlight, the highest at 12.00, while the lowest temperature at 03.00 to 05.00 WIB. While the highest temperature is at 13.00 and the highest humidity is at night. Keywords: dutch bucket, greenhouse, IoT, microclimate, Thingspeak
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