Bus duct temperature acquisition device based on LoRa and Contiki system

Abstract

The invention discloses an on-line monitoring device, in particular to a bus duct temperature acquisition device based on the LoRa Internet of Things and the Contiki system. The device includes a temperature sensor, a main controller, a LoRa RF module, an antenna, an indicator light, and a power supply module. The temperature collection data transmission adopts the wireless method to reduce the construction complexity and save the construction cost. The problem of distance limitation of the traditional wireless communication methods is solved and the arrangement of the gateway is reduced. Since the gateway cost is generally much higher than the node cost, the construction cost can be greatly reduced.

Description

technical field [0001] The invention relates to an online monitoring device, in particular to a bus duct temperature acquisition device based on the LoRa Internet of Things and Contiki system. Background technique [0002] The busway is a closed metal device composed of copper and aluminum busbar columns, which is used to distribute large power to various components of the decentralized system. It has increasingly replaced wires and cables in indoor low-voltage power transmission trunk line projects. [0003] With the rapid development of our country's economy, the power consumption of all walks of life is increasing day by day, and the traditional cables with a current of thousands of amps seem to be unable to do what they want. At this time, it is a matter of course for the busway to enter the historical stage. [0004] Due to the strong current-carrying capacity of the busway, it is very common to have a current of thousands of A in some occasions with large load power. ...

AI Technical Summary

Problems solved by technology

This is a relatively traditional method, which is time-consuming and labor-intensive. Generally, the inspection cycle is relatively long, and it is difficult to find problems in the first place, and hand-held thermal imaging cameras are generally more expensive; 2. Install at the bus duct joint The temperature sensor is connected to the monitoring center through a bus such as RS485, and the detection and analysis are carried out through special equipment. If there is an over-temperature situation, it can alarm in time

This method can achieve real-time detection of temperature collection, but because it is connected to the computer room, the computer room needs to be guarded by someone to deal with sudden failures in time, and in terms of construction, due to the need to lay RS485 and other buses to transmit temperature sensor data, Therefore, there are problems such as wiring difficulties; 3. Install a temperature detection device composed of a temperature sensor and a ZigBee communication module at the position of the bus duct joint, and send it to a nearby gateway wirelessly through the ZigBee network protocol, and then the ZigBee gateway Send the collected temperature data to the cloud server through GPRS or network cable

Although this method avoids the wiring problem of construction, because ZigBee works on the 2.4G public channel, there are a large number of Bluetooth and WiFi devices, the electromagnetic interference is very serious, and it is easy to cause data loss; in addition, due to the direction of the electromagnetic wave in the 2.4G frequency band The performance is relatively good, and the diffraction ability is very weak. In electric wells and relatively curved channels, the communication distance is very limited, resulting in a relatively limited number of nodes that can be linked under each gateway, so it is necessary to increase the number of gateways. In this way It is necessary to configure more SIM card data package fees, which is not conducive to the reduction of later maintenance costs

Moreover, due to the limited communication distance, the location selectivity of the gateway layout is also limited. In places such as electric wells or basements, it is inevitable to arrange gateways, but these places often have no GPRS signal, resulting in temperature data. It has been sent to the gateway, but the gateway cannot send it to the server, and the data will be lost at that time

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