Web Based Smart Meter for General Purpose Smart Home Systems with ESP8266

In this paper, open source and modular smart home system is designed and implemented. The Consumer Internet of Objects (CIoT) approach is adopted in this design. WiFi-based CIoT network has been designed to monitor energy consumption in smart homes. In the CIoT network, the current and voltage values have been measured with the current sensor SCT-013 CT 100A and 9 V AC/AC step-down transformer connected to the Arduino Nano development board. Real power, apparent power and power factor values have been calculated by using measured current, voltage values and phase angle. These measured and calculated values have been sent to the ESP8266 NodeMCU development board by Software Serial technique. The ESP8266 provides HTML based user interface to computers and mobile devices connected to the CIoT network via the TCP/IP protocol. An access point has been used the WiFi connection. The user interface is displayed via the web browser of the devices with TCP/IP protocol. Four buttons on the user interface control the four relays connected to the CIoT network. Experimental studies show that the designed system could be used in general purpose applications such as energy monitoring in smart home systems.