IRBlaster

IRBlaster, or infrared blaster, is a device that emits infrared light to control consumer electronics that use IR remote control signals. It acts as the transmitter counterpart to a traditional remote, allowing a computer, smart hub, or dedicated hardware to replicate button presses.

A typical IR blaster consists of an infrared LED or an array of LEDs, a driver circuit, and often a microcontroller or interface that connects to a host system. Many models connect via USB or networked interfaces, while some are integrated into dedicated home automation hubs. Some units also include an IR receiver to learn codes from existing remotes so the system can duplicate them later.

Signal transmission involves sending modulated IR pulses at a carrier frequency around 38 kHz, following established remote control protocols such as NEC, RC5, or Sony SIRC. Software on the host system stores, maps, and transmits these codes to the blaster. Popular software ecosystems include LIRC and WinLIRC on various platforms, as well as broader home automation environments that support IR devices.

Common applications include controlling televisions, AV receivers, Blu-ray players, projectors, and other devices from a centralized system or automation routine. IR blasters are widely used in home theater setups, media centers, and smart home configurations to provide universal remote functionality or to automate device control where direct smart integrations are unavailable.

Limitations include dependence on line of sight and a typical range measured in meters, potential interference from other IR sources, and the need for accurate codes or learning capabilities for each device. Some devices rely on RF remotes or network interfaces, which require different control approaches.