3.1 Main Control Chip
The ESP8266 Wi-Fi module shown in Fig. 3 is used in the main control chip. It can fully
meet the design requirements of the system in terms of performance, power consumption, and cost. ESP8266 module contains front-end Wi-Fi and high-performance
32-bit MCU and has the advantages of rich interface, small size, low power consumption and low price [1]. This module has three working modes: STA, AP, and
STA + AP. The system uses STA mode, connecting the Internet through routers, providing access for remote data transmission, and realizing remote control of nodes.
3.2 Power Supply Circuit
The power supply circuit is the basis of hardware circuit realization. The system uses
external 220 V power input. In view of the power supply demand of 5 and 3.3 V in the
module of hardware design, the buck circuit is designed as shown in Fig. 4.
Power
Supply Circuit
Main Control
Chip
Smoke
Monitoring Circuit
Relay
Control Circuit
Fig. 2. Hardware design diagram
Fig. 3. ESP8266 Wi-Fi module
Fig. 4. Power supply circuit diagram
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