HS-S29A Infrared Signal Transmitter Module – IR Remote-Control Emitter for Arduino and Embedded Projects

The HS-S29A Infrared Signal Transmitter Module is a compact IR emitter board for sending remote-control style infrared commands from a microcontroller. It is useful for TV, air-conditioner, media-player, robot, and smart-home experiments where a project needs to transmit modulated near-infrared light to a compatible receiver.

The module can be driven by Arduino-compatible boards such as the ELAB Nano V3 or by a larger controller stack using the UNO R3 Prototype Expansion Board. For a paired learning setup, use it with a receiver module such as 38KHz IR Transmitter and Receiver Modules and a status indicator like the RGB Full Color LED Module.

Most consumer remote-control protocols use a carrier around 38kHz, generated in software or by a timer/PWM output. Keep the IR LED pointed toward the receiver, avoid bright sunlight during testing, and confirm whether the target device uses NEC, Sony, RC5, or another protocol before sending commands.

Technical Specifications

Board Layout & Label Guide

• IR LED – Emits modulated infrared light toward the target receiver.
• Signal Pin – Connect to a GPIO or PWM output from the controller.
• VCC – Module supply pin; follow the board label.
• GND – Common ground with the controller.
• Series Drive Network – Onboard circuitry shown in the schematic supports easier driving than a bare LED.
• Line of Sight – Aim the emitter directly at the receiver for best range.
• Carrier Timing – Use a library or timer that generates the correct carrier frequency.
• Ambient Light Note – Strong sunlight or reflective surfaces can reduce reliability.

Application Scenarios

1. Arduino NEC Command Transmit

Send a NEC-style command using the IRremote library.

#include const int irPin = 3;void setup() { IrSender.begin(irPin);}void loop() { IrSender.sendNEC(0x00FF, 0x45, 0); delay(1000);}

2. Repeating IR Beacon

Transmit a repeated command as a simple IR beacon.

#include void setup() { IrSender.begin(3);}void loop() { for (int i = 0; i < 3; i++) { IrSender.sendNEC(0x10EF, 0x20, 0); delay(100); } delay(2000);}

3. ESP32 Carrier Test

Generate a 38kHz PWM carrier for receiver alignment checks.

const int irPin = 18;void setup() { ledcAttach(irPin, 38000, 8);}void loop() { ledcWrite(irPin, 128); delay(100); ledcWrite(irPin, 0); delay(900);}

4. Button-Controlled IR Send

Send a command only when a pushbutton is pressed.

#include const int buttonPin = 2;void setup() { pinMode(buttonPin, INPUT_PULLUP); IrSender.begin(3);}void loop() { if (digitalRead(buttonPin) == LOW) { IrSender.sendNEC(0x00FF, 0x15, 0); delay(300); }}

Packing List

• 1 x HS-S29A Infrared Signal Transmitter Module

FAQ

Q: What does this module do?
A: It sends infrared remote-control style signals from a microcontroller.

Q: Does it receive IR signals?
A: No, this page is for the transmitter module.

Q: What carrier frequency should I use?
A: 38kHz is common for remote-control receivers.

Q: Can it control a TV?
A: Yes, if you know the correct protocol and command codes.

Q: Can I use Arduino IRremote?
A: Yes, it is a common library for this use case.

Q: Why is range short?
A: Check aiming, carrier frequency, drive strength, ambient light, and receiver compatibility.

Q: Does it need line of sight?
A: Yes, IR control generally works best with line of sight.

Q: Can it be used with ESP32?
A: Yes, use a PWM-capable output or IR library.