How to Use Keyes IR: Examples, Pinouts, and Specs

The Keyes IR Sensor Module, manufactured by ETC_BVN (Part ID: uno), is an infrared sensor used for detecting objects and measuring distance by emitting and receiving infrared light. This versatile component is widely used in various applications, including obstacle detection, line-following robots, and proximity sensing.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply and the GND pin to the ground of your circuit.
2. Output Signal: Connect the OUT pin to a digital input pin on your microcontroller (e.g., Arduino UNO).

  Arduino UNO          Keyes IR Sensor Module
  ------------         -----------------------
  5V  ----------------> VCC
  GND ----------------> GND
  Digital Pin 2 ------> OUT

// Keyes IR Sensor Module Example Code
// Connect the OUT pin of the sensor to digital pin 2 on the Arduino UNO

const int sensorPin = 2; // Pin connected to the sensor's OUT pin
const int ledPin = 13;   // Pin connected to the onboard LED

void setup() {
  pinMode(sensorPin, INPUT); // Set sensor pin as input
  pinMode(ledPin, OUTPUT);   // Set LED pin as output
  Serial.begin(9600);        // Initialize serial communication
}

void loop() {
  int sensorValue = digitalRead(sensorPin); // Read the sensor value

  if (sensorValue == HIGH) {
    digitalWrite(ledPin, HIGH); // Turn on the LED if object is detected
    Serial.println("Object detected!");
  } else {
    digitalWrite(ledPin, LOW);  // Turn off the LED if no object is detected
    Serial.println("No object detected.");
  }

  delay(100); // Small delay to avoid serial monitor flooding
}

• Power Supply: Ensure the sensor is powered within the specified voltage range (3.3V - 5V).
• Interference: Avoid placing the sensor near sources of infrared interference, such as direct sunlight or other IR-emitting devices.
• Distance Calibration: The detection range can vary based on the reflectivity of the object. Test and calibrate the sensor for your specific application.

1. No Detection:

   • Issue: The sensor does not detect any objects.
   • Solution: Check the power connections and ensure the sensor is properly powered. Verify that the object is within the detection range (2cm - 30cm).

2. False Positives:

   • Issue: The sensor detects objects when there are none.
   • Solution: Ensure there are no sources of infrared interference nearby. Adjust the sensor's position and angle.

3. Inconsistent Readings:

   • Issue: The sensor provides inconsistent readings.
   • Solution: Verify stable power supply and proper grounding. Ensure the sensor is not exposed to rapid changes in ambient light.

• Q: Can the Keyes IR Sensor Module detect transparent objects?

  • A: The sensor may have difficulty detecting transparent objects due to low reflectivity of infrared light.

• Q: What is the maximum detection range of the sensor?

  • A: The maximum detection range is approximately 30cm, but it can vary based on the object's reflectivity.

• Q: Can I use the sensor with a 3.3V microcontroller?

  • A: Yes, the sensor operates within a voltage range of 3.3V to 5V, making it compatible with both 3.3V and 5V microcontrollers.

By following this documentation, users can effectively integrate the Keyes IR Sensor Module into their projects, ensuring reliable object detection and distance measurement.