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38kHz IR Transmitter Sensor Module for Arduino & Robotics

38kHz IR Transmitter Sensor Module for Arduino & Robotics

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SpecificationDetails
Operating Voltage5V DC
Carrier Frequency38kHz
Effective Distance1 to 2 Meters (Environment dependent)
Wavelength940nm
InterfaceDigital (DAT, VCC, GND)
LED Size5mm Standard IR LED
Logic LevelHigh/Low Trigger


Price
₹ 59.32 ₹ 59.32
(Tax included)

Product Description

The 38kHz IR Transmit Module is a "plug-and-play" solution for wireless data transmission. It consists of a high-output 940nm infrared LED driven by a simple transistor circuit on a compact PCB. When a 38kHz modulated signal is applied to the data pin, the LED flashes at that frequency, allowing it to be picked up by a standard IR receiver (like the TSOP1838). This module is ideal for creating "TV-B-Gone" style projects, DIY remote controls, or wireless "trip-wire" security sensors.

Key Features

  • Standard 38kHz Frequency: Fully compatible with common IR receiver modules and commercial household appliances.

  • Transistor-Driven Output: Includes an onboard transistor to drive the IR LED, ensuring the microcontroller's GPIO pin is not overloaded by high current.

  • Directed Emission: The 5mm LED provides a focused beam, allowing for point-to-point communication with minimal interference.

  • Easy 3-Pin Interface: Features standard headers for Power, Ground, and Data, making it breadboard-friendly.

  • Invisible Communication: Uses 940nm light, which is invisible to the human eye, allowing for discreet signaling.

Technical Details

  • Emission Angle: Approx. 20 to 30 degrees.

  • Current Draw: ~20mA when active.

  • Signal Type: Modulated Digital Signal.

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.