LoRa Fire Alarm System

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/ 2019-07-04 / Tech

Abstract: With the continuous development of China's economy and technology and the vigorous advancement of urbanization, urban high-rises, super high-rise buildings, underground buildings and large-scale comprehensive buildings are increasing, and fire hazards are also greatly increased. Here is the architecture of the wireless intelligent fire protection system, and how to prevent, early warning and timely treatment of the fire.

 

According to the statistics of China Fire Network,  2018 nationwide received a total of 237,000 fires, resulting in 1,407 deaths, 798 injuries, direct property losses up to 36.75 100 million yuan. In 2018, the national fire rescue team dispatched 1.157 million police officers, rescued 150,000 people trapped in distress from disaster accidents, evacuated 526,000 people, and saved 31.9 billion yuan in property protection.

 

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Can you receive an alarm in the first time of a fire, which is related to the life safety and property safety of the affected people. It is necessary to early warning, early control, and effective life reduction. And property damage requires a more advanced and intelligent fire warning system.The following is a brief introduction to the building fire protection system:

 

1, fire alarm process

 

fire alarm process As large as: when the fire, temperature, light, gas concentration and other fire field parameters exceed a given threshold, the audible and visual alarms act and send an alarm signal, which is transmitted to the regional fire alarm control through the wireless transmission module (or) The centralized fire alarm controller emits an audible and visual alarm signal and simultaneously displays the location of the fire to notify the fire attendant to respond. This is what we usually call an automatic fire alarm system.

 

 

图 3

 

2, routine maintenance

 

Fire equipment needs regular inspection and installation at each inspection location A patrol label records the attendance records of the patrol personnel through RFID radio frequency swipe technology. It is uploaded to the terminal through LoRa wireless communication, and the terminal processes the data and uploads it to the cloud for statistical attendance data.

 

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3, fire alarm

 

A fire terminal Below the device, hundreds of smoke detectors are connected wirelessly, and the smoke detectors periodically report the heartbeat packets to ensure normal operation. When a disaster occurs,The smoke detector will trigger a sudden report, and the alarm information will be directly reported to the fire department through the 4G network of the gateway, and the first time will respond.

 

The following is an introduction to the Lora system solution.

 

The LoRaWAN system solution consists of three parts: LoRaWAN terminal, LoRaWAN gateway and ZWS cloud platform. The following is the system framework for the LoRa system solution:

 

Terminal 1 implements CLASS Class A devices and periodically uploads temperature and humidity. Terminal 2 implements a CLASS Class A device and periodically uploads the ADC measurement voltage. The terminal 3 implements the CLASS C device and waits for the ZWS command to be sent at any time.The gateway is responsible for network connection communication between the ZWS and the terminal. The ZWS is responsible for adding/removing devices, delivering data to the terminal, and displaying data reported by the terminal. You can modify the terminal, gateway, ZWM cloud according to your own needs, or you can use the routine directly.

 

 

LoRaWAN terminal module can use ZLG gonggong LM400TU module, LoRa comes with ARM Cortex-M0+32 bit chip, available The customer conducts secondary development. Ultra low power standby current: 22.2mA, sleep current: 1uA . Maximum transmission rate: 37.5 kbps, support LoRa transparent transmission, LoRaWAN, LoRaNET protocol.

 

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