Home Automation System using Internet-of-Things & Blynk App

In recent times, human intervention has been significantly reduced with the help of Internet-of-Things devices. A better monitoring control and faster response is received with the help of this technology. Human machine interaction is increasing continuously and Internet-of-Things is a step ahead by connecting the smart objects with the internet and therefore making overall working easier. In this work, a cost effective, energy efficient and flexible design of home automation is proposed which connects and controls various home appliances using NodeMCU, Google assistance and Blynk app. It provides a helping hand for the old aged and for differently abled persons. Human intervention is significantly reduced and in case of emergencies it has detecting capabilities which make it more reliable. User friendliness is provided through Google Assistant using voice commands. Blynk application helps to connect through an app and by using IFTTT, user can create a customised command for each job for Google Assistant. Proposed design also take care of the gas, temperature and humidity of the house using DHT11; the temperature and humidity sensor and MQ02; which is a gas sensor. Values of these sensors are displayed in the application which is connected to the relay. NodeMCU has been used for connecting Blynk app. Blynk server has been configured with NodeMCU using authentication key and further Blynk server is connected to the webhooks server which acts as a broker. For connecting Google Assistant, IFTTT has been used using IF-THEN conditions.