38kHz IR Transmitter Sensor Module for Arduino & Robotics

Prototyping and Engineering Tips from Robogears

• The Modulation Requirement: Simply pulling the data pin "HIGH" will turn the IR LED on, but an IR receiver will not detect it. You must send a 38kHz square wave (pulsed signal) for the receiver to "see" the signal. Most Arduino users utilize the IRremote library to handle this modulation automatically.

• Current Boosting: If you need to increase the range beyond 2 meters, you can provide an external 5V power source to the module while keeping the data pin connected to your MCU. The onboard transistor handles the switching safely.

• Visual Verification: Since you cannot see IR light, you can check if the module is working by looking at the LED through a smartphone camera. Most digital cameras can see the faint purple/white glow of the IR LED when it is active.

• Line of Sight: Infrared is a light-based communication. Ensure there are no physical obstacles between the transmitter and receiver. For wider coverage, you can sand the tip of the IR LED with fine sandpaper to "diffuse" the light.

Package Includes

• 1 x 38kHz Infrared Transmit Sensor Module

Disclaimer

Avoid looking directly into the IR LED at close range for long periods. While the light is invisible, high-intensity IR can still cause eye strain. Ensure the polarity (VCC/GND) is correct before powering the module.