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 Automatic Home Appliances Remote control electrical appliances  Setting up  IR sensor  connection to Atmega 328P is very simple. Beside VCC and GND  pin , the  sensor  has only one output  pin  that should be connected to one of digital  pins  of the Atmega 328P. HC - 05  has red LED which indicates connection status, whether the  Bluetooth  is connected or not. Before connecting to  HC - 05 module  this red LED blinks continuously in a periodic manner. When it gets connected to any other  Bluetooth  device, its blinking slows down to two seconds. This  module works  on 3.3 V - 6V but you can use only 5V DC. this module use any Serial  AMS1117  is a popular SMD package 3-pin voltage regulator that is available in many models for fixed and adjustable voltage requirements. The IC can deliver a maximum current of 1A and the output voltage can vary from 1.5V to 5V. It also has a low drop out voltage of 1.3V when operating at maximum current. pin number 1 GND, pin 2 OUTPUT,