The thesis presents an IoT network built on ESP32 + DHT11 nodes. Each reading is locally time-stamped, pre-processed, and reliably sent over MQTT to Home Assistant, then stored long-term in InfluxDB via line protocol. Data are visualised in Home Assistant, InfluxDB, and Grafana. Experiments confirmed stable communication, accurate timestamps, and low power use. The result is a flexible, scalable platform for small environmental IoT deployments.