What does HX1838 Infrared (IR) Receiver work?

The HX1838 IR Receiver module is a commonly used infrared receiver for remote control systems. It detects IR signals transmitted by remote controls and converts them into electrical signals, which can then be processed by a microcontroller. Here’s a detailed look at its features, pin configuration, and a simple guide to get started with it.

Features

• High sensitivity: Capable of detecting low-level infrared signals.
• Low power consumption: Efficient power usage.
• Compact size: Easy to integrate into various projects.
• Demodulation capability: Automatically demodulates the 38kHz modulated IR signal from a remote control.

Pin Configuration

The HX1838 module typically has three pins:

1. VCC: Power supply pin (typically 3.3V or 5V).
2. GND: Ground pin.
3. OUT: Signal output pin.

Technical Specifications

• Operating Voltage: 2.7V to 5.5V
• Reception Distance: Up to 18 meters (depending on the remote control and environmental conditions)
• Carrier Frequency: 38kHz
• Reception Angle: ±45 degrees

Using the HX1838 with an Arduino

Here’s a step-by-step guide to using the HX1838 IR receiver module with an Arduino to receive signals from an IR remote control.

Wiring

• Connect the VCC pin of the HX1838 to the 5V pin on the Arduino.
• Connect the GND pin of the HX1838 to the GND pin on the Arduino.
• Connect the OUT pin of the HX1838 to a digital input pin on the Arduino (e.g., pin 11).

Code

To decode the IR signals, you can use the IRremote library. Follow these steps:

A. Install the IRremote Library:

• Open the Arduino IDE.
• Go to Sketch > Include Library > Manage Libraries.
• Search for IRremote and install it.

B. Upload the Code:

#include <IRremote.h>
#include <IRremoteInt.h>

const int RECV_PIN = 11; // Pin to which the output of HX1838 is connected
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup() {
  Serial.begin(9600); // Start the serial communication
  irrecv.enableIRIn(); // Start the IR receiver
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.print("Received: ");
    Serial.println(results.value, HEX); // Print the received value in hexadecimal
    irrecv.resume(); // Receive the next value
  }
}

Explanation

• Include the IRremote library: This library handles the decoding of the IR signals.
• Set up the IR receiver: Initialize the IR receiver on pin 11.
• Decode and print the signals: In the loop, check if a signal has been received. If so, print the received value to the Serial Monitor in hexadecimal format and then resume receiving.

Troubleshooting Tips

• Ensure proper connections: Double-check the wiring to ensure the module is properly connected to the Arduino.
• Remote control check: Make sure the remote control is functioning and its batteries are not dead.
• Avoid interference: IR signals can be affected by strong light sources, so avoid using the module in direct sunlight or near other sources of IR interference.

Applications

• Home automation: Control devices such as lights, fans, or appliances using a remote control.
• Robotics: Use an IR remote to control a robot’s movements or functions.
• Custom remote controls: Create your own remote-controlled projects, such as a remote-controlled car or a TV remote.

The HX1838 IR receiver module is a versatile component that can be used in various remote control applications. With its simple interface and reliable performance, it is a great choice for hobbyists and professionals alike.