Infrared IR Sensor Obstacle Avoidance Sensor KY-032

Features:

1. Distance Adjustable: Detection range from 2cm to 40cm, adjustable via potentiometer.
2. Wide Voltage Compatibility: Operates at 3.3V to 5V; works with Arduino, ESP32, ESP8266, Raspberry Pi, etc.
3. Ambient Light Adaptability: Performs reliably under varying light conditions.
4. Infrared Emitter and Receiver: Uses IR LED and photodiode for reflection-based detection.
5. Simple Pin Configuration: 4 pins - GND, + (Vcc), S (Signal), EN (Enable); jumper configurable.
6. Distance and Frequency Adjustment: Left knob adjusts range; right knob adjusts IR pulse frequency.
7. Low Power Consumption: Operates at 20mA current.
8. Temperature Range: -10°C to 50°C operating environment.
9. Effective Angle: 35° detection cone.
10. Compact Design: 1.6 x 4 cm, weight: 9g.
11. TTL Output: LOW signal = obstacle detected; HIGH = no obstacle.
12. Multi-turn Resistance: Enables fine-tuning of sensitivity and range.
13. IR Pulse Frequency: Operates at 38kHz, compliant with HS0038DB specs.

Principle of Work:

1. IR Emission: IR LED emits 38kHz pulses outward.
2. Reflection Detection: IR photoreceptor detects reflected light from objects.
3. Logic Output: Output is HIGH when no object; LOW when object is detected.

Interaction with Microcontroller (MCU):

1. Connections: Connect GND, Vcc, S (Signal) to MCU digital input, and EN to digital output (optional).
2. Voltage Supply: 3.3V–6V DC.
3. Sensitivity Adjustment: Adjust using onboard trimpots.
4. Output Signal: Digital HIGH/LOW.
5. Enable Pin: HIGH to enable; LOW to disable. Jumper available for always-on mode.
6. Programming: Read digital pin and act accordingly (e.g., turn on LED, stop motor).

Pinout:

Applications:

• Obstacle avoidance in robotics
• Line-following robots
• Proximity sensing in sanitizers and faucets
• Security and intrusion detection
• Smart lighting control
• Object counting and positioning in automation
• Gesture recognition
• Automatic door opening
• Interactive displays and kiosks
• DIY electronics and automation projects

Circuit Diagram:

Library:

No library required.

Example Code:

int sensorPin = 8;
int enablePin = 7;
int ledPin = 10;

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(enablePin, OUTPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(enablePin, HIGH);  // Enable sensor
  int val = digitalRead(sensorPin);
  
  if (val == HIGH) {
    digitalWrite(ledPin, HIGH);  // Obstacle detected
  } else {
    digitalWrite(ledPin, LOW);   // No obstacle
  }
}

Technical Details:

• Operating Voltage: 3.3V – 6V DC
• Operating Current: ≥ 20mA
• Detection Range: 2cm to 40cm
• Detection Angle: 35°
• Output: LOW (obstacle), HIGH (clear)
• Sensitivity: Adjustable via trimpot
• Temperature Range: -10°C to +50°C
• Output Signal: TTL level

Resources:

• Fritzing Part: KY-032 IR Sensor Module
• Datasheets: HS0038DB IR Receiver, NE555 Timer

Comparison Table: