Many users, when they first pick up a new Xiaomi smartphone or a sub-brand called Redmi, are surprised to find a small black window on the top end of the case, not a noise reduction microphone or proximity sensor, but a full-fledged infrared transmitter (IR Blaster). While most flagship device manufacturers have abandoned this feature in favor of thin housing and water protection, the Chinese giant has retained it as one of the key features of the ecosystem.
Having this module turns your Xiaomi Redmi into a universal remote control that can replace a stack of plastic “colleagues” for TV, air conditioning, audio system and other household appliances. This solution eliminates the need to search for original remotes that often get lost or fail, and allows you to control all multimedia equipment directly from the screen of your smartphone.
The technology is based on encoded infrared signals, just like conventional remotes, but the MIUI or HyperOS software shell provides much more options, including voice control, scripting, and storage of settings in the cloud. Let's take a look at the possibilities that this modest-looking design element offers.
The principle of operation of the IR emitter in mobile devices
The infrared port in Xiaomi smartphones works by transmitting data through light waves that are not visible to the human eye. Inside the black window on the end of the case is a special LED that flashes at a high frequency, modulating the signal according to a certain code, this signal is perceived by the receiver of household appliances, which converts light pulses back into commands to perform actions.
Unlike Bluetooth or Wi-Fi, infrared requires direct vision between the transmitter and the receiver. The signal does not pass through walls and does not reflect well from surfaces, which, paradoxically, is an advantage in electronically crowded rooms. The absence of radio interference ensures that your neighbor's TV will not switch channels when you add volume to yours.
⚠️ Note: Infrared port does not require devices to pair, but the effective operating distance is usually limited. 5-8 meters and the angle of deviation from the axis shall not exceed 30 degree-to-stay.
Modern implementations of the IR ports in the Redmi Note and the flagships of the Xiaomi Mi series support a wide range of frequencies. This allows you to emulate signals not only from old TVs, but also from modern technology with different coding protocols. The software part takes on the most difficult work - finding the right code from a huge database of thousands of hardware models.
The main application Mi Remote: functionality and capabilities
The center of control of all infrared economy is pre-installed application Mi Remote (or "Mi remote" in Russian localization), which acts as an interface, providing the user with virtual buttons that completely duplicate the functionality of physical remotes, the first start system will prompt you to choose the type of device you want to control.
The setup process is as simple as possible and does not require technical knowledge. You just need to select a category of device (for example, "TV"), then the manufacturer's brand. Then the test buttons appear on the screen. If the device responds to clicks, you confirm the choice, and the remote is ready to go. If there is no response, the application will suggest checking other codes.
- 📺 Universality: Support for thousands of brands, including Samsung, LG, Sony, Philips and lesser-known Chinese brands.
- 🗣 Voice Search: Integration with Google Assistant allows you to search for content or manage the volume of voice commands.
- ☁️ Cloud Storage: Customized remotes are saved in the Mi Account, which allows you to quickly restore them when you change your smartphone.
- 🔌 Smart Home: The ability to add devices to an automation scenario, although a separate Mi Home app is more commonly used for this.
An important feature of the app is that it can create multiple remote profiles for one type of appliance, for example, you can set up one remote for your home TV and another for your living room or hotel TV while traveling, and it takes one second to switch between them via the drop-down menu in the app interface.
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If your TV is not on the list of supported brands, try to choose Generic or Outer and search for working code from a similar device.
Compatibility with different household appliances
While IR port is most commonly associated with TVs, the range of compatible appliances is much wider, with the Mi Remote app database being updated regularly to include new models of air conditioners, audio systems, projectors and even some types of lighting fixtures, making the smartphone an indispensable tool in a hotel room or rented apartment, where the original remotes are often lost.
Air conditioning management is of particular value. Many users forget where the split control is in the winter, and in the summer it can take a long time to find it. The smartphone is always at hand, allowing you to quickly break the temperature or change the mode of operation. It also supports complex audio systems, where it is important to have access to an equalizer and a choice of sound source.
| Type of device | Main functions | Nuances of work |
|---|---|---|
| Television | On, channels, volume, menu | It works stably, supports smart functions |
| Air conditioner | Temperature, modes, fan speed | Requires direct visibility, no feedback |
| Projector | Focus, zoom, signal source. | Often, accurate positioning of the phone is required. |
| Audio system | Loudness, tracks, equalizer | Support for old and new protocols |
It is worth noting that to control equipment over Wi-Fi (for example, some models of Xiaomi TV or smart light bulbs) IR port is not required, because it uses a network connection. However, for classic equipment released before the era of the Internet of things, the infrared emitter remains the only way to integrate with a smartphone without buying additional “smart” bridges.
☑️ Verification of technical compatibility
How to set up a remote for TV or air conditioning
It takes no more than a minute to set up the new device in the Mi Remote app. First, make sure your Xiaomi Redmi is unlocked and the screen is on. Approach the controlled app at a distance of 2-3 meters and point the top end of the phone towards the signal receiver. Launch the app and press the add-on button (usually a plus icon).
Select a category of device from the list below. If you're not sure about the brand, you can use automatic determination, but manual selection gives a more accurate result. After selecting the brand, the test buttons will appear on the screen. Press them and monitor the reaction of the equipment. If the TV turns off or changes volume, press Yes.
Customization path: Mi Remote → Add (+) → TV → Brand → Button Test → SaveIn some cases, especially with older models, you may need to go through several code options. The app will show different sets of buttons. Take your time, check all the basic functions: turn on, change temperature and blow modes. Once you have successfully set up, give the remote control a name, for example, "Bedroom Air Conditioner" so that you do not get confused in the future.
⚠️ Note: When setting up your air conditioner, make sure you are close enough to the device, as the IR signal may be weaker than the TV due to the location of the receiver on the split body.-systemyou.
What if the automatic search does not find the device?
Advantages of IR-controllable over physical analogues
The switch to smartphone management has some undeniable benefits that millions of Redmi owners have appreciated. One is the saving of space. Instead of having five different remotes on a coffee table, you have one device that is always charged and ready to go, which is especially true for minimalist interiors.
Second, you can back up your settings, you can lose your physical remote, you can break it, you can spill coffee on it, you carry your smartphone with you all the time, and you have minimal risk of losing it within your apartment, and you just log in to your account when you buy a new Xiaomi phone, and all the remotes you have set up automatically up from the cloud.
- 🔋 Energy efficiency: the IR module consumes a minimum amount of energy, practically without affecting the autonomy of the smartphone.
- 📱 Additional features: The ability to use the keyboard to enter text in YouTube or Netflix search, which is inconvenient to do with a conventional remote control.
- 🔄 Update: The codebase is updated online, adding support for new hardware without buying new hardware.
Another important aspect is hygiene: Remote controls are among the dirtiest items in the house, collecting dust and bacteria. We wash and wipe the smartphone much more often, which reduces the risk of spreading germs. In addition, the glass screen of the phone is easier to clean than the rubberized buttons of a plastic remote.
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Integration of the IR port into the smartphone eliminates the problem of the “lost remote” and combines the management of all equipment in one interface with the possibility of voice input.
Frequently encountered problems and their solution
Despite the reliability of the technology, users can face a number of challenges, the most common being the lack of response to commands, often because the phone has a protective case that covers the IR port, and make sure that the hole on the upper end is free and not closed.
Another problem is a discharged battery. Although the IR LED consumes little power, at a critically low charge (less than 5-10%), the system can restrict the peripheral modules to save the main battery, and it is also worth checking whether the IR port function is disabled in the developer settings or special features, although it is active by default.
If the remote is unstable, try removing the device from the app and adding it again by selecting a different brand code. Sometimes, code from one manufacturer is great for another brand's technology (e.g., code from Haier might be good for Supra). Experiment with options if the standard one doesn't work perfectly.
⚠️ Note: Do not use third-party apps from the Play Market to manage the IR port if the Mi Remote app is not working. Third-party software may mishandle Xiaomi specific hardware drivers, causing module overheating or system failures.
Alternative scenarios for the use of an IR emitter
User and developer fantasy is not just a thing, and IR port is not just a tool for home appliance management, but also a remote control device for projector presentations, which is convenient for business meetings, and some enthusiasts use IR port to send signals to security cameras to check their response to external influences.
When combined with automation (such as through Tasker or embedded scripts), an IR port can become part of a smart home. You can customize a "I'm at home" script that, when connected to Wi-Fi, will send an on signal to the TV and air conditioner. While it's better to use Wi-Fi devices for a full-fledged smart home, the IR port remains a great bridge for old tech.
The IR port can also be a disaster tool, and if you lose your TV remote at a hotel or a party, your Xiaomi Redmi is a lifeline. You don't have to look for batteries or wait for a remote to be replaced at the reception, you just open the app and continue watching your favorite TV series.