Smart DC Home for Energy Saving with Android-Based Real-Time Energy Monitoring

Operating household electrical appliances non-stop, due to heavy use of electricity, such as turning on lights and fans every day without supervision, would result in large bills. The Smart DC Home system can be monitored by monitoring the use of electrical energy in DC households, using a DC source connected to the Internet of Things. Smart DC Home is designed and implemented to control and monitor the energy use of DC electrical appliances such as fans and LEDs in DC households. Energy use from DC loads is measured using the ACS712 current sensor and a voltage divider circuit that functions as a voltage sensor. The Smart DC Home system was built using the STM32F407 Discovery microcontroller and Node-MCU ESP8266. Motion sensors are used to activate electric fans when human movement is detected in the room. The lighting will turn on when no sunlight is detected outside the house, or when someone is moving in the room, it will be detected by a combination of the motion sensor and a light-dependent resistor (LDR) sensor. Energy usage monitoring can be done through the Android application with an Android phone connected to the internet. The results of this study indicate that the Smart DC Home system can save DC household energy use by up to 21.29%.