| dc.description.abstract | Electrical energy has a limited supply so it must be used sparingly in
everyday life. One way to save electricity is to use less electricity for lighting and
other electronic devices in your home. By using the open source operating system
on an Android smartphone, you can create an application to control home
electronic devices using the Arduino NodeMCU ESP8266 module and a 4-
channel relay module, replacing manual switches with automatic switches. An
Android application in the form of a Telegram bot is used to input commands to
the NodeMCU ESP8266 module via a wireless connection in the form of an
Internet hotspot. The NodeMCU ESP8266 module responds to input via
predetermined pins with outputs in the form of logic low (0V) and logic high (5V).
These pins are connected to a 4-channel relay module which is connected to
house lights, fans, or other electronic devices. When a low input (0V) is received,
the relay is activated, turning on the lights and fans and turning on the device.
When a high input (5V) is received, the relay is deactivated, cutting power to the
lights and fan, and turning them off. | en_US |
