SYSTEM DESIGN

The system includes:

• Two smoke detection modules, each consisting of an Arduino Pro Mini microcontroller and an MQ2 smoke sensor.
• One gateway module using a NodeMCU ESP8266 connected to a Wi-Fi network. This module collects information from the sensors and the doorbell module to control the vibration module.
• One doorbell module uses an Arduino Pro Mini microcontroller to collect the doorbell’s status.
• One compact vibration module is designed using an Arduino Pro Mini microcontroller and a Vibration Motor 1027 to generate vibrations, notifying the user.
• The modules communicate with each other through the LoRa network. The gateway collects information from the two smoke sensor modules and the doorbell module. Based on the received signals, it controls the vibration module and simultaneously updates the sensor status to the cloud via the Wi-Fi network.

HOW IT WORKS

• When smoke is detected, the MQ2 smoke sensor is activated. A message is sent to the central device via the LoRa network. The central device processes the message and forwards it to the vibration module. Upon receiving the activation signal from the gateway, the vibration module will continuously vibrate for 3 minutes.
• When someone presses the doorbell, a message containing the doorbell’s status is sent to the central device. Upon receiving the signal from the doorbell module, the vibration module will activate with intermittent vibrations for 1 minute. At the same time, a notification will be sent to the user’s smart devices, such as smartphones or tablets.

CONCLUSION

• The system serves as a stepping stone toward expanding the smart sensor network and integrating alert and notification capabilities for people with disabilities. It is hoped that in the future, the system can be further developed and improved to bring greater benefits to everyday life.