How to Use Green led: Examples, Pinouts, and Specs

The Green LED (Light-Emitting Diode) manufactured by Lina, with part ID 1, is a versatile and energy-efficient electronic component. It emits green light when a forward current flows through it, making it ideal for a wide range of applications. Green LEDs are commonly used as status indicators, in displays, and in decorative lighting systems. Their low power consumption and long lifespan make them a popular choice in both hobbyist and professional electronics projects.

Below are the key technical details for the Lina Green LED (Part ID: 1):

The Green LED has two pins:

Note: The longer leg of the LED is the anode, and the shorter leg is the cathode. If the legs are trimmed, the flat edge on the LED casing indicates the cathode.

1. Determine the Resistor Value: To prevent damage, always use a current-limiting resistor in series with the LED. The resistor value can be calculated using Ohm's Law: [ R = \frac{V_{supply} - V_f}{I_f} ] Where:

   • (V_{supply}) is the supply voltage.
   • (V_f) is the forward voltage of the LED (2.2V typical).
   • (I_f) is the desired forward current (20mA typical).

   For example, with a 5V supply: [ R = \frac{5V - 2.2V}{0.02A} = 140\Omega ] Use the nearest standard resistor value (e.g., 150Ω).

2. Connect the LED:

   • Connect the anode (+) to the positive terminal of the power supply through the resistor.
   • Connect the cathode (-) to the ground.

3. Power the Circuit: Apply the supply voltage, and the LED will emit green light.

• Polarity Matters: Ensure the anode and cathode are connected correctly. Reversing the polarity may damage the LED.
• Avoid Overcurrent: Exceeding the maximum current (30mA) can permanently damage the LED.
• Use a Resistor: Always use a current-limiting resistor to protect the LED.
• Heat Management: While the Green LED generates minimal heat, ensure proper ventilation in high-power applications.

Below is an example of how to connect and control the Green LED using an Arduino UNO:

• Connect the anode (+) of the LED to a 220Ω resistor.
• Connect the other end of the resistor to digital pin 13 on the Arduino.
• Connect the cathode (-) of the LED to the Arduino's GND pin.

// Green LED Blink Example
// This code blinks a Green LED connected to pin 13 of the Arduino UNO.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output pin
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. LED Does Not Light Up:

   • Cause: Incorrect polarity.

   • Solution: Ensure the anode is connected to the positive voltage and the cathode to ground.

   • Cause: No current-limiting resistor or incorrect resistor value.

   • Solution: Verify the resistor value and connections.

2. LED is Dim:

   • Cause: Insufficient current.
   • Solution: Check the resistor value and ensure the supply voltage is adequate.

3. LED Burns Out:

   • Cause: Excessive current.
   • Solution: Use a resistor with the correct value to limit the current.

4. LED Flickers:

   • Cause: Unstable power supply or loose connections.
   • Solution: Check the power source and ensure all connections are secure.

Q: Can I connect the Green LED directly to a 3.3V or 5V power supply?
A: No, you must use a current-limiting resistor to prevent excessive current from damaging the LED.

Q: What happens if I reverse the polarity of the LED?
A: The LED will not light up, but it typically won't be damaged unless a high reverse voltage is applied.

Q: Can I use the Green LED with a PWM signal?
A: Yes, the Green LED can be dimmed or controlled using a PWM signal from a microcontroller like an Arduino.

Q: How do I identify the anode and cathode if the legs are trimmed?
A: Look for the flat edge on the LED casing, which indicates the cathode (-).

By following this documentation, you can effectively use the Lina Green LED (Part ID: 1) in your projects.