This paper discusses the design and implementation details of home automation, monitoring, and security system using the Internet of Things (IoT) and some open source technologies. The IoT is the network of physical objects or “Things” embedded with electronics, software, sensors and network connectivity which enable these objects to collect and exchange data. The user here can interact directly with the system through a web-based interface over the Internet, while monitoring and control of domestic home appliances such as lights are remotely controlled through a user-friendly web page. Monitoring is carried out by sending the sensor data to an open source platform called Thinger which shows the status of the device and also the location of the device with values of the sensor.