How to Use EE-SY310 Reflective Opto sensor: Examples, Pinouts, and Specs

The EE-SY310 Reflective Opto Sensor by Omron is a compact and versatile sensor designed for the detection of objects through the reflection of light. It integrates an infrared light emitter and a phototransistor detector, making it ideal for applications such as object presence sensing, position control, and rotational speed detection. This sensor is commonly used in industrial automation, robotics, and various consumer electronics.

• Supply Voltage: 5 VDC
• Output Current: 20 mA (max)
• Sensing Distance: 0.5 mm to 5 mm
• Response Time: 1 ms (typical)
• Ambient Temperature Range: -25°C to +55°C
• Dimensions: 4.0 mm × 2.5 mm × 1.8 mm (L×W×H)

To use the EE-SY310 in a circuit, follow these steps:

1. Connect the anode of the emitter to a 5 VDC power supply through a current-limiting resistor. The value of the resistor can be calculated using Ohm's law, considering the forward voltage and current of the emitter.
2. Connect the cathode of the emitter to the ground (GND).
3. Connect the collector of the phototransistor to the input of a microcontroller or another interface circuit. A pull-up resistor is typically used on this line.
4. Ensure that the sensor is positioned correctly with respect to the target object to optimize the reflection of the infrared light.

• Avoid exposing the sensor to direct sunlight or strong artificial light sources to prevent false triggering.
• Ensure that the surface of the object being detected is reflective enough for reliable operation.
• Keep the sensor clean and free from dust or other contaminants that could affect its performance.

// Define the pin connected to the collector of the opto sensor
const int optoSensorPin = 2;

void setup() {
  // Configure the opto sensor pin as an input
  pinMode(optoSensorPin, INPUT);
  // Initialize serial communication at 9600 bits per second
  Serial.begin(9600);
}

void loop() {
  // Read the state of the opto sensor
  int sensorValue = digitalRead(optoSensorPin);
  // Print out the value to the serial monitor
  Serial.println(sensorValue);
  // Delay for a bit to avoid spamming the serial monitor
  delay(100);
}

• Sensor not responding: Ensure that all connections are secure and the power supply is at the correct voltage.
• Inconsistent detection: Check the alignment of the sensor with the target object and the reflectivity of the object's surface.
• Output always high or low: Verify that the pull-up resistor is correctly installed and that there are no shorts or open circuits in the wiring.

• If the sensor is not responding, double-check the wiring against the pin configuration table.
• For inconsistent detection, adjust the distance between the sensor and the object or improve the object's surface reflectivity.
• Ensure that the ambient light conditions are stable and do not interfere with the sensor's operation.

Q: Can the EE-SY310 be used with a 3.3V system? A: While the EE-SY310 is rated for 5V, it may work at 3.3V with reduced performance. However, it is recommended to use a level shifter for proper operation.

Q: What is the maximum sensing distance of the EE-SY310? A: The maximum recommended sensing distance is 5 mm, but this can vary depending on the object's reflectivity and ambient light conditions.

Q: How can I adjust the sensitivity of the sensor? A: Sensitivity can be adjusted by changing the distance between the sensor and the object or by using a variable resistor in the emitter circuit to adjust the light intensity.

For further assistance, please contact Omron's technical support or refer to the detailed datasheet of the EE-SY310 Reflective Opto Sensor.