Indoor Air Quality Monitoring System with Node.js and MQTT Application

Air pollution is always a problem that continuous to grow every time. Not only affects the environment, air pollution also affects human health so it needs to be dealt with quickly. Air quality in environment especially indoor area becomes something that is rarely considered. Even though we spend more time indoors, so it's also important to know the air we breathe. In today's modern era, air monitoring can utilize applications on our technology and internet devices, it can be an interesting and efficient thing to monitor. In this Internet of things project the monitoring system built by integrating software and hardware with device microcontroller and low-cost sensor MQ 135 and DHT 11. Node sensor produces data and processed with a microcontroller. The resulting data then immediately transmitted to the cloud by internet network using MQTT and combine with Node.js MQTT open source clients used to publish messages and subscribe to topics on brokers. Wireless Sensor Network also applied so sensor nodes can be placed anywhere and data can be acquired into one dashboard display. A web-based dashboard was built to facilitate access of information from existing air quality in different room.