IR 5mm Infrared Led (Receiver + Transmitter)

A 5mm Infrared (IR) LED Transmitter and Receiver pair

 is a matched set of optoelectronic components designed for wireless signaling and sensing. These components typically operate at a 940nm wavelength, which is invisible to the human eye but highly detectable by silicon-based sensors.

Technical Specifications

• Transmitter (Emitter):
• Forward Voltage: Typically 1.2V to 1.5V.
• Drive Current: 20mA recommended for standard use, with peak pulses up to 100mA for longer range.
• Beam Angle: Approximately ±20° to 30°.
• Appearance: Usually has a clear, transparent lens.
• Receiver (Photodiode):
• Forward Voltage: Approximately 1.2V to 1.3V.
• Operation: Connected in reverse polarity; it allows current to flow proportionally to the amount of IR light it detects.
• Appearance: Often features a black or dark blue filter to block ambient visible light and reduce interference.

Common Applications

These pairs are widely used in hobbyist and industrial electronics for:

• Remote Controls: Sending encoded signals to devices like TVs or air conditioners.
• Obstacle Detection: Used in robotics for proximity sensing and line tracking.
• Security Systems: Creating "beam-break" alarms where an alarm triggers if the invisible path between the transmitter and receiver is interrupted.
• Pulse Oximetry: Measuring blood oxygen levels in medical monitoring devices.