How to Use SR602 : Examples, Pinouts, and Specs

The SR602 (Manufacturer Part ID: MH-SR602) is a low-power, dual-channel infrared receiver module designed and manufactured by ABC-RC. It is optimized for remote control applications, operating at a frequency of 38 kHz. The SR602 is capable of receiving signals from infrared remote controls, making it an essential component for consumer electronics, home automation systems, and other IR-based communication projects.

• Remote control signal reception for TVs, audio systems, and set-top boxes
• Home automation systems for IR-based device control
• Robotics and IoT projects requiring IR communication
• Consumer electronics with IR-based user interfaces

The SR602 is designed to provide reliable performance in a compact form factor. Below are its key technical specifications:

The SR602 module has three pins, as described in the table below:

The SR602 is straightforward to use in a circuit. Follow the steps below to integrate it into your project:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. Connect the Output: Connect the OUT pin to a microcontroller or other digital input device. The output will be active low, meaning it will go low (0V) when an IR signal is detected.
3. Positioning: Ensure the module is positioned to face the IR transmitter directly for optimal signal reception. Avoid obstructions between the transmitter and receiver.
4. Decoding the Signal: Use a microcontroller (e.g., Arduino UNO) to decode the received IR signal. Libraries such as the IRremote library for Arduino can simplify this process.

Below is an example of how to connect and use the SR602 with an Arduino UNO to decode IR signals:

• VCC: Connect to the Arduino's 5V pin.
• GND: Connect to the Arduino's GND pin.
• OUT: Connect to Arduino digital pin 2.

#include <IRremote.h> // Include the IRremote library

const int RECV_PIN = 2; // Define the pin connected to the SR602 OUT pin
IRrecv irrecv(RECV_PIN); // Create an IR receiver object
decode_results results;  // Variable to store decoded IR data

void setup() {
  Serial.begin(9600); // Initialize serial communication
  irrecv.enableIRIn(); // Start the IR receiver
  Serial.println("IR Receiver is ready");
}

void loop() {
  if (irrecv.decode(&results)) { // Check if an IR signal is received
    Serial.print("IR Code: ");
    Serial.println(results.value, HEX); // Print the received IR code in hexadecimal
    irrecv.resume(); // Prepare to receive the next signal
  }
}

• Power Supply: Ensure a stable power supply to avoid erratic behavior.
• Interference: Avoid placing the module near sources of IR interference, such as sunlight or fluorescent lights.
• Signal Decoding: Use appropriate libraries or algorithms to decode the received IR signals accurately.

1. No Signal Detected:

   • Ensure the IR transmitter is functioning and pointed directly at the SR602.
   • Check the wiring connections, especially the VCC and GND pins.
   • Verify that the power supply voltage is within the specified range (3.3V to 5.5V).

2. Erratic or Unreliable Output:

   • Minimize interference from ambient light sources.
   • Ensure the module is not placed too far from the IR transmitter (maximum range is 18 meters).

3. Output Always Low:

   • Check if the IR transmitter is continuously sending signals.
   • Verify that the OUT pin is correctly connected to the microcontroller.

4. Output Always High:

   • Ensure the IR transmitter is active and sending signals.
   • Confirm that the SR602 is receiving sufficient power.

Q1: Can the SR602 work with 3.3V microcontrollers like ESP32?
A1: Yes, the SR602 operates within a voltage range of 3.3V to 5.5V, making it compatible with 3.3V microcontrollers.

Q2: What is the maximum distance for reliable signal reception?
A2: The SR602 can reliably receive signals up to 18 meters in a direct line of sight.

Q3: Can the SR602 detect signals from any IR remote?
A3: The SR602 is designed to detect signals modulated at 38 kHz, which is the standard for most IR remote controls.

Q4: How do I decode complex IR protocols?
A4: Use libraries like IRremote for Arduino or similar tools for other platforms to decode complex IR protocols easily.

By following this documentation, you can effectively integrate the SR602 into your projects and troubleshoot any issues that arise.