RS485 Based Weather Monitoring System Using Multiple RTU and Raspberry Pi

The aim of the project is to make weather monitoring system to measure temperature, humidity, air velocity and day & night stages. Our system monitors parameters and store them to Raspberry pi. This design is mainly based on Raspberry pi, RTUs and RS485. The RS485 is an important communication interface during computer and external communication devices, which is widely used in monitor-control system and project application. Since RS485 Serial Port has the advantage of far distance communication and anti-jamming, it is very popular in industry fields. RTU is Slave made of LPC2148 board with sensors and 16x2 LCD. The value of sensors are not only be displayed on 16x2 LCD, but also can be sent and displayed to raspberry pi using RS485 interface. A multithreaded protocol is used for the transmission of device data between the Raspberry pi and the Boards. The project has three areas in which focus is aimed. The first area is the creation of a Raspberry pi program that will control devices throughout the RS485 network. The second aim is giving each RTU the ability to take input from the sensors as well as collect and send data from attached devices. Lastly the construction of network adapters that will allow multiple devices to communicate with raspberry pi on one seamless network. The sole purpose of this project is to make the RTU for weather monitoring system which can work effectively over long distance.