If you've ever noticed a small black window on the top of a Xiaomi Redmi smartphone, it's an infrared (IR) port, and many users don't even know it exists, let alone how to use it, and it turns your phone into a universal remote control, from TV to air conditioning.
In the era of smart homes and Bluetooth devices, IR port may seem an anachronism, but in practice it remains one of the most reliable ways to control household appliances. Unlike Wi-Fi or radio signals, infrared beams do not pass through walls, but they do not require a connection to the network and work even when the Internet is off, making it an ideal solution for controlling equipment in environments where communication stability is critical, such as in country houses or offices with poor coverage.
In this article, we will look at what devices can be controlled through the infrared port on Redmi, how to configure its work, what applications are needed for this, and even reveal several non-obvious applications – from light control to automation of routine tasks.
What is an IR port and how does it work
An infrared port is a module that sends infrared signals at frequencies recognized by household appliances, and its operation is similar to traditional remote control panels: pressing a button on a smartphone screen generates code that is converted into an infrared pulse and transmitted to the device.
The main technical characteristics of the IR port in Xiaomi Redmi:
- 📡 Range: up to 5-7 meters in line of sight (depending on the phone model and ambient lighting).
- 🔄 Frequency range: standard 38-56 kHz, compatible with most appliances.
- 🔋 Energy consumption: Minimum (does not affect battery life)
- 🛠️ Protocol: supports NEC, RC5, Sony SIRC and other popular IR control protocols.
It's important to understand that an IR port is not a bidirectional channel -- it only sends commands, but it can't get feedback from devices, for example, you can't get the current temperature of the air conditioner through the IR port, but you can easily change it.
⚠️ Warning: Not all Redmi models have an IR port. For example, the Redmi Note 12 line does not have one, whereas the Redmi Note 11 Pro+ or Redmi K50 does. Please check the specifications on Xiaomi's official website before buying.
What devices can be controlled through the IR port
The list of supported equipment is limited only by the presence of an IR receiver in the device.
| Category of devices | Examples | Features of management |
|---|---|---|
| Television and media systems | Samsung, LG, Sony, Xiaomi TV, Android TV-box | Full control: channel switching, volume control, and application launch (e.g. Netflix or YouTube). |
| Air conditioning and climate systems | Gree, Daikin, Mitsubishi, Ballu | Adjusting temperature, operating modes (heating / cooling), timers, air flow directions. |
| Audio engineering | Stereosystems, soundbars, receivers (Yamaha, Pioneer) | Control of signal sources, equalizer, volume. Some models support multi-zone audio. |
| Projectors and screens | Epson, BenQ, XGIMI | On/off, picture correction (keston, focus), switching inputs. |
| Other devices | Fans, humidifiers, some models of robot vacuum cleaners (for example, Xiaomi Mi Robot) | Limited functionality – usually only basic commands (on/off, speed). |
Interesting fact: you can control even some car alarms (like StarLine or Pandora) through an IR port, if they support IR key fobs, and this will require special software and code customization.
How to turn on and configure an IR port on Xiaomi Redmi
By default, the IR port on Redmi does not require a separate turn on — it activates automatically when the compatible application is first launched.
- Make sure there are no physical obstacles to the IR beam on the phone (such as a cover or film covering the port).
- Update the firmware to the latest version (old versions of MIUI could have bugs with an IR port).
- Install the official Mi Remote app (available on Google Play or AppGallery).
Instructions for setting up Mi Remote:
- Open the application and allow access to the Camera (you need to scan QR- codes from remote control).
- Click Add Device and select a category (e.g., "TV").
- Choose a brand from the list (if you don’t have one, try the universal protocol).
- Direct the phone’s IR port to the device and follow the on-screen instructions to test commands.
If the device is not recognized:
- 🔍 Try manually entering the code from the instruction to the remote (Other methods in Mi Remote).
- 📱 Check if the IR port is blocking the protective glass or case (especially with metal inserts).
- 🔄 Restart your phone and try again.
Make sure the port is not covered with a cover
Update the Mi Remote app to the latest version
Check for device availability in the application database
Point your phone at the device from a distance of no more than 3 meters
Use a right angle (not tilted)-->
Top-5 applications for IR device management
While Mi Remote is the standard solution from Xiaomi, there are alternative applications with advanced functionality.
- ZaZa Remote supports more than 1,000 brands, has a built-in button editor and the ability to create macros (for example, "Cinema" - turn off the lights, turn on the TV and soundbar).
- AnyMote Universal Remote Can work not only with IR, but also with Wi-Fi/Bluetooth- devices. There is a learning feature - you can "copy" commands from the original remote.
- SURE Universal Remote has a database of 900,000 devices and supports voice control via Google Assistant. Suitable for smart homes.
- IR Plus Minimalist interface with gesture support (e.g. swipe up to increase volume) works without the Internet.
- BroadLink Manager: allows you to create automation scenarios (for example, turn on the air conditioner if the room temperature is above 25 ° C).
Tip: If you use Xiaomi Home, some IR devices can be integrated into scenarios along with other Mi Ecosystem gadgets. For example, when you open the door with the Xiaomi Smart Door Lock camera, the TV will automatically turn on.
💡
Save a backup of remote settings to the cloud (if the app supports this feature). When you reset your phone or reinstall the software, you don't have to reconfigure everything.
Hidden opportunities of the IR port: non-obvious ways of using
In addition to basic control equipment, the IR port on Redmi can be used for more creative tasks:
- 🎮 Game consoles: Some retro consoles (such as the Nintendo Wii or PlayStation 2) support IR remotes. With special profiles in Mi Remote, you can emulate the original gamepad.
- 💡 Smart lighting: IR-receiver lamps (e.g., Xiaomi Yeelight older models) can be turned on without Wi-Fi.
- 🚗 Automotive functions: Control of the tape recorder, opening the trunk or activating the seat heating (if the car supports IR commands).
- 🔌 Sockets and relays: Some “smart” sockets (e.g., BroadLink SP3) may receive IR signals to turn on/off.
Another interesting option for enthusiasts is to create your own IR commands using applications like IR Remote Control or Hex Code Sender.
- 🔧 Program unique button combinations (e.g., turn it off—TV, soundbar, and lights at the same time).
- 📊 Analyze signals from the original remotes (unless they are automatically recognized).
- 🤖 Automate routine activities via Tasker or MacroDroid (e.g., turn on the air conditioner over a timer).
How to find out the IR code of the device manually?
Frequent problems and their solutions
Despite the simplicity of the technology, users sometimes face challenges, and here are the most common ones and ways to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| IR port does not respond to commands | Port closed with cover or contaminated | Clean the port with a soft brush, remove the cover |
| The device is not recognized in Mi Remote | Brand is not in the database or the wrong protocol is selected | Try the universal protocol or add the device manually by code |
| Commands are executed with a delay | A weak signal due to a long distance or bright light | Bring the phone closer (up to 3 m) and remove the sources of IR radiation (for example, incandescent lamps) |
| The application gives an error "IPC port not detected" | Software failure or disconnected access to sensors | Restart your phone, check permissions for the app in the settings |
If none of the methods did not help, check the performance of the IR port using the test:
- Open the camera on another smartphone.
- Direct Redmi's IR port to the camera and send any command via Mi Remote.
- On the camera screen should appear violet light (IR-ray is visible in the infrared spectrum).
⚠️ Warning: If the IR port is physically damaged (for example, after a phone crash), it will be cheaper to repair it in a service center than replacing the entire camera module with which it is often combined.
Security and Restrictions of the IR Port
Although IR technology is considered safe, it has a few nuances to be aware of:
- 🔐 No encryption: IR signals are transmitted in plain sight and can be intercepted by special equipment (e.g., IR sniffer). However, in practice, this is unlikely, because malicious intent and physical access to your home are necessary.
- 📶 Limited range: Unlike Wi-Fi or radio signals, an IR beam doesn't go through walls and requires line of sight. It's both a plus (you can't control your TV from the next room) and a minus (you need to point your phone exactly).
- 🔄 Feedback impossibility: You can't get data from the device (e.g., the current temperature of the air conditioner or the volume of the TV).
To improve safety:
- Do not store screenshots with IR codes in the public domain (they can be used to control your equipment).
- If you use an IR port to control alarms or locks, change access codes regularly.
- In smart homes, combine IR control with other protocols (e.g., Wi-Fi for monitoring and IR for commands).
💡
The IR port is not suitable for controlling devices that require feedback (such as thermostats or video surveillance systems), in such cases it is better to use Wi-Fi or Zigbee.