1

Arduino Uno

Arduino can be used to handle the logic to send out IR commands via the IR Transmitter

2

NodeMCU

WiFi module is used to receive the Alexa Commands via Amazon server. Alternatively can use this module for the logic as well instead of the Arduino UNO.

3

IR Receiver and Transmitter

IR Receiver is used to collect the commands you want to use. The IR Transmitter is used to send out those same commands when called for by ALEXA.

4

Resistors

Current limiting resistors used to prevent overcurrent in circuit.

5

NPN Transistor

These are used as a current amplifier so the IR transmitter sends out a strong enough signal.