How to Use IR Blasters for Voice-Controlled TV

Learn how to control your TV with an IR blaster and Alexa using Node-RED.

Posted by Nina Alvarez on May 04, 2025 · 5 mins read

How to Use IR Blasters for Voice-Controlled TV

Isn’t it amazing how far technology has come? Our grandparents might have thought we were living in a sci-fi movie when they see us controlling our home appliances with just our voices. If you’ve embraced the world of smart home automation, you probably have an Amazon Alexa device and a few other smart gadgets. But have you ever thought about using an IR blaster to control your TV using Alexa? If the answer is no, you’re in for a treat! This guide will walk you through how to set up an IR blaster for voice-controlled TV using Node-RED. Let’s dive in!

Step-by-Step Setup Guide

Getting started with an IR blaster can seem daunting, but it’s simpler than you may think! Here’s a step-by-step guide to set up your IR blaster with Node-RED for seamless voice control.

What You Will Need:

  1. An IR Blaster (look for brands like Broadlink or similar)
  2. Amazon Alexa-enabled device
  3. Node-RED installed on your smart home hub (check out the Node-RED website for installation instructions)
  4. Basic understanding of Node-RED flows

Step 1: Connecting Your IR Blaster

  1. Power Up the Blaster: Follow the manufacturer’s instructions to connect your IR blaster to a power source and your Wi-Fi network.
  2. Configure the Device: Use the accompanying app (like Broadlink’s) to configure your IR blaster. You’ll need it to learn the IR commands from your remote control.

Step 2: Learning Your TV’s IR Codes

  1. Open the App: Go to the app that controls your IR blaster.
  2. Select Learn Mode: Tap on ‘Learn’ and then press the power button (or any other button) on your remote control.
  3. Save the Commands: Once your IR blaster records the command, save it under a recognizable name.

Step 3: Setting Up Node-RED

  1. Launch Node-RED: Open Node-RED in your web browser (usually on http://localhost:1880 unless otherwise configured).
  2. Install Required Packages: You may need to install the node-red-contrib-ir or a similar package to interface with your IR blaster.
  3. Create a Flow: Drag and drop the necessary nodes to create a flow that sends the IR command when triggered. For example:
    • Inject Node: This can simulate a button press.
    • Function Node: Use this to specify the command based on your IR blaster configuration.
    • IR Node: Connect to the IR blaster to send commands.

Step 4: Integrating with Alexa

  1. Set Up the Alexa Node: If you’re using Node-RED, you can integrate your Alexa using the alexa home skill node red package.
  2. Create Alexa Commands: Set up the appropriate flows so that you can trigger the IR commands via voice. For example, “Alexa, turn on the TV” can trigger the appropriate IR code sending flow.

Step 5: Testing

  1. Test the Flow: Use the debug node in Node-RED to ensure your flow works correctly.
  2. Voice Commands: Finally, try to control your TV with voice commands through Alexa!

Helpful Tip Block

  • Voice Control Phrasing: Use consistency in how you interact with Alexa. If you set a command to “Turn on the TV,” always use this exact phrase.
  • Check Your Wi-Fi: Make sure your IR blaster and Alexa are on the same Wi-Fi network for seamless communication.
  • Use a Timer: If you want to take it a step further, consider setting timers for the TV to turn on or off automatically. You can do this in your Node-RED flow as well!

Common Issues & Troubleshooting

  1. IR Blaster Not Responding: Ensure the blaster has a clear line of sight to your TV, as IR signals require direct paths.
  2. Alexa Not Recognizing Commands: Make sure the Alexa app is properly linked to your Node-RED installation, and check the voice command phrases.
  3. Flow Does Not Trigger: Use the debug node in Node-RED to pinpoint where in the flow your setup is failing, and double-check each node’s configuration.
  4. Commands Timing Out: If you have slower devices, consider adding a small delay in your Node-RED flow using a delay node to ensure commands are executed properly.

Final Thoughts

Setting up an IR blaster to control your TV with Alexa opens a world of convenience and enhances your smart home experience. Plus, using Node-RED allows for unbelievable customization in how you want your devices to work together. Don’t be afraid to experiment with different setups and explore further functionalities. Enjoy your journey into smart home automation—and soon, you’ll be the proud owner of a fully voice-controlled home theater system! Happy tinkering!

← Previous Post Next Post →