Research Article
Research and Design of Distributed Fire Alarm System of Indoor Internet of Things Based on LoRa
Table 1
List of node peripherals.
| | Component | Model | Quantity | Description |
| | STM32 development board | STM32L151C8T6 | 1 | Main control chip, data processing, storage, and other operations | | DC-DC converter | TLV62565 | 1 | DC 5 V lithium battery power supply voltage is reduced to DC 3.3 V processor normal working voltage | | Analog-to-digital converter (ADC) | | 1 | Collect gas sensor data and battery power | | Gas sensor | MQ-2 | 1 | Analog output sensor for detecting the concentration of liquefied petroleum gas and alcohol (C3H60) | | Gas sensor | MQ-7 | 1 | Analog output sensor for detecting carbon monoxide (CO) concentration | | Temperature and humidity sensor | DHT11 | 1 | Analog output sensor for detecting ambient temperature and humidity | | LoRa communication module | SX1276 | 1 | Wireless radio frequency module chip, upload the data in child nodes to the gateway | | Antenna | SMA-KA | 1 | Increase LoRa RF frequency, dbm | | LEDs | | 3 | Alarm, normal working operation indication, low battery reminder, operation status indication | | Buzzer | | 1 | Fire alarm and low battery reminder |
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