IRdropin

IRdropin is a term used in hardware design and hobbyist communities to describe a modular infrared interface that can be inserted into an existing device with minimal modification to the host circuitry. The goal is to provide IR receiving and optional transmitting capability through a compact drop-in module.

A typical IRdropin module combines an infrared receiver, a microcontroller or dedicated controller core, and a host interface such as I2C, SPI, or UART. Some variants integrate an infrared LED emitter and a driver to enable remote control transmission, while others provide only receive functionality. The module is designed to be controlled by firmware on the host or by its own processor to decode and report IR data.

Protocol support generally includes common IR standards such as NEC, RC-5, RC-6, and Sony SIRC. Transmitter-enabled versions can emit standard command sequences, making the module usable as a bridge between a remote and a host device or as a drop-in IR gateway for home automation.

Key design considerations include timing accuracy, signal integrity, and resistance to ambient light and electrical noise. Power consumption, thermal performance, and a compact form factor are important for portable uses. Some implementations address safety and regulatory requirements for IR emitters.

IRdropin is not a single standardized product but a concept adopted by multiple vendors and maker communities. Implementations vary in interfaces, protocols, and firmware. It is used to accelerate integration of IR control into consumer electronics, set-top boxes, and prototyping projects.