How to Use Adafruit LED Sequin - Emerald Green: Examples, Pinouts, and Specs

The Adafruit LED Sequin in Emerald Green is a compact, surface-mount LED module designed to add a touch of light to your electronic projects. These tiny LEDs are perfect for creating wearable electronics, adding visual indicators to your projects, or simply providing decorative lighting with a vibrant emerald green hue. Their small size and easy-to-use design make them suitable for hobbyists and professionals alike.

• Wearable electronics (e.g., costumes, fashion accessories)
• Decorative lighting for models and miniatures
• Visual indicators for user interfaces or status displays
• Educational projects to teach basic electronics and soldering

• Color: Emerald Green
• Operating Voltage: 3.0V - 3.6V
• Current: 5mA (typical)
• Brightness: 500 mcd (typical)
• Viewing Angle: 120 degrees

1. Power Supply: Ensure that your power supply is within the operating voltage range of 3.0V to 3.6V. Exceeding this voltage can damage the LED.

2. Current Limiting Resistor: Always use a current-limiting resistor in series with the LED to prevent it from drawing too much current. A resistor value of 150Ω to 220Ω is typically used when powered by a 3.3V source.

3. Soldering: The LED sequin has small pads for soldering to your circuit. Use a fine-tip soldering iron and be careful not to overheat the LED.

4. Polarity: Pay attention to the polarity of the LED. The '+' pad should be connected to the positive side of the power supply, and the '-' pad to the negative side or ground.

• Avoid reverse polarity as it can permanently damage the LED.
• Do not exceed the maximum current rating of 5mA.
• When sewing the LED Sequin into wearable projects, ensure that conductive threads do not short-circuit.
• Test the LED with a multimeter before installation to confirm functionality.

// Define the pin connected to the LED Sequin
const int ledPin = 9; // PWM pin for brightness control

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  analogWrite(ledPin, 127); // Set brightness to approximately 50%
  delay(1000);              // Wait for 1 second
  analogWrite(ledPin, 255); // Set brightness to 100%
  delay(1000);              // Wait for 1 second
}

Note: When connecting the LED Sequin to an Arduino, ensure you use a current-limiting resistor and that the Arduino's output does not exceed the LED's maximum voltage.

• LED Not Lighting Up: Check the polarity of the connections and ensure the power supply is within the specified voltage range.
• LED Too Dim: Confirm that the current-limiting resistor is not too high and that the power supply voltage is adequate.
• LED Burnt Out: This can happen if the LED was subjected to reverse polarity or if the voltage/current exceeded the specifications.

• Always double-check the polarity before powering up the LED.
• Use a multimeter to verify the voltage across the LED and the current through the circuit.
• If the LED is not working, replace it and recheck the circuit for any potential issues.

Q: Can I chain multiple LED Sequins together? A: Yes, you can chain them in parallel, ensuring each LED has its own current-limiting resistor.

Q: How do I attach the LED Sequin to fabric? A: You can sew the LED Sequin onto fabric using conductive thread, but ensure there are no short circuits.

Q: Are these LEDs washable? A: The LED Sequins are not designed to be washed. If they are part of a wearable project, remove the electronics before washing the fabric.

For further assistance or questions, please contact Adafruit customer support or refer to the community forums.