Design of Portable Weather Station Using MQTT Protocol

PWS (Portable Weather Station) based on IoT is a set of integrated meteorological sensors and automatically records meteorological data (temperature, air humidity, and air pressure) and stored in SD Card as a data logger. This data generates an electrical signal that will be accommodated and modified by the microcontroller. Then, it displayed on LCD. The data is stored inside the SD Card every two seconds. This device has a level of accuracy of above 95 percent. According to WMO, the error rate should not be more than 5 percent. A message transmission system is an essential component in an IoT device for collecting data or sending commands. In this paper, we designed and implemented a reliable message transmission system using the MQTT protocol to maintain ordering between messages for the work environment. MQTT protocol acts as data transmission in real-time so that the device monitored in long-distance with a smartphone. The application on the smartphone is MQTT dash, but the device maker must pre-set the application.