Control de cámaras de germinación hidropónicas mediante Internet de las Cosas [Not available in English]

This work presents the implementation of a telemetry and control system through IoT, the purpose of which is to remotely control several germination chambers for hydroponic crops in greenhouses. Communication is carried out over the Internet using the MQTT protocol to a Mosquitto broker embedded in a Raspberry Pi board. This system allows access to the visualization of the germination control variables from a Smartphone or any device with an Internet connection and to receive alerts when any of them presents an anomalous behavior. The telemetry and control devices of each chamber consist of a NodeMCU module, which controls a DHT22 humidity and temperature sensor, a level sensor based on Hall effect, a DS18B20 temperature sensor with which the temperature measurement is performed in nutrients, as well as two relay modules that control the start-up of the nutrient recirculation pump and forced ventilation.n of the nutrient recirculation pump and forced ventilation.