MQTT Client Publisher

SMTP Email Alert

Sensors & Actuators

DHT11 Temperature & Humidity

Push Button (door latch)

LEDs (Alarm LED)

Raspberry Pi (Processing Node)

Sensor Acquisition

Alarm Logic

Database Storage (SQLite)

Local Services

App

🟨 MyQtthub Cloud MQTT Broker

MQTT Application Dashboard (Mobile App)

MyQtthub Cloud MQTT Services (Broker)

Email Alert (SMTP Service)

SQLite (Local Database on Raspberry Pi)

MQTT Protocol (Communication Layer)

Raspberry Pi Hardware Layer: DHT11 Sensor Push Button LEDs