Serial port controlled infrared transmitter with PIC

This is a programmable infrared (remote control) transmitter, which can be controlled from a PC serial port. It is capable of sending many remote control formats, including the Philips RC-5 standard. Exact formats with the timing parameter names are shown on the pictures:

The programmable infrared transmitter is designed to facilitate the transmission of infrared signals that can mimic various remote control protocols, including the widely used Philips RC-5 standard. The device operates by interfacing with a PC via a serial port, allowing for precise control over the emitted infrared signals.

The circuit typically consists of a microcontroller that manages the encoding of the infrared signals. This microcontroller is connected to a serial interface, enabling communication with the PC. The serial port allows the user to send commands and data to the microcontroller, which interprets these signals and generates the appropriate timing sequences for the infrared transmission.

An infrared LED serves as the output component of the circuit, emitting modulated infrared light that corresponds to the selected remote control format. The modulation frequency and pulse width are critical parameters that must be accurately controlled to ensure compatibility with various devices. This modulation is often achieved using a timer or PWM (Pulse Width Modulation) functionality within the microcontroller.

Power supply considerations are also essential, as the circuit requires a stable voltage source, typically around 5V, to ensure reliable operation of the microcontroller and the infrared LED. The design may also incorporate additional components such as resistors and capacitors for signal conditioning and to protect the LED from excessive current.

To program the device, users can utilize a dedicated software interface on the PC that allows for the selection of different remote control formats and the customization of timing parameters. This flexibility makes the programmable infrared transmitter a versatile tool for various applications, including home automation, remote control testing, and educational projects in electronics.This is a programmable infrared (remote control) transmitter, which can be controlled from a PC serial port. It is capable of sending many remote control formats, including the Philips RC-5 standard. Exact formats with the timing parameter names are shown on the pictures: 🔗 External reference