Home-Automation Home Automation with Nodemcu and Alexa Components NodeMCU ESP8266 module 5V Relay IN4007 Diode IN4148 Diode / 330 Ω Resistor Transistor BC547 Voltage Regulator 7805 LED DC Socket Terminal Connector PCB Header change ssid and password at alexa-esp8266.ino with your wifi credentials.