A house security system can be designed with DIO-1HT, DIO-220 and DIO-844. AQM-1200 (Air Quality Monitor) is also included in this design. All DIO devices and AQM device use the WiFi technique to send messages to the MQTT Server (MQSVR-500/1000).  MQSVR will process the received messages, and alarms will be sent to the users in case of abnormal conditions or urgent status prevails. MQSVR will also respond to messages as well. 

The system will monitor doors, windows, CO/smoke, PIR., etc. An emergency button is provided to send an urgent signal to the outside for dispatching emergency help/service. Intruder alarms, high CO/Smoke gas shall generate alarm messages (LINE) to the users, and also will sound the Siren connected to one of the DO ports in DIO-844. DO ports are also used to control the front door light and the front door lock.

DIO-1HT provides temperature and humidity measurement. AQM-1200 provides the measurement of temperature, humidity, PM 1.0/2.5/10, CO, CO2, HCHO and TVOC gases in the house.