How to Use Schematic Green LED: Examples, Pinouts, and Specs

The Schematic Green LED is a light-emitting diode (LED) that emits green light when an electric current flows through it. This component is widely used in electronic circuits as an indicator, status light, or part of a display system. Its low power consumption, long lifespan, and bright green illumination make it a popular choice for hobbyists and professionals alike.

• Power and status indicators in electronic devices
• Visual feedback in control panels and dashboards
• Part of multi-color LED arrays for displays
• Educational and DIY electronics projects
• Signal indicators in communication systems

Below are the key technical details for the Schematic Green LED:

The Schematic Green LED has two pins:

Note: The flat edge on the LED casing or a shorter pin indicates the cathode.

1. Determine the Resistor Value: To prevent damage to the LED, always use a current-limiting resistor in series. Calculate the resistor value 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 (2.0V to 2.4V).
   • ( I_f ) is the forward current (20mA or 0.02A).

   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 (GND).

3. Test the Circuit: Power the circuit and observe the green light emitted by the LED.

• Polarity Matters: Ensure the anode and cathode are connected correctly. Reversing the polarity may damage the LED.
• Avoid Overcurrent: Always use a current-limiting resistor to prevent excessive current from flowing through the LED.
• Heat Management: While LEDs generate minimal heat, ensure proper ventilation in high-power applications.
• Series and Parallel Configurations: For multiple LEDs, calculate resistor values for each configuration.

The Schematic Green LED can be easily controlled using an Arduino UNO. Below is an example of how to blink the LED:

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

// Blink a green LED connected to pin 13 of the Arduino UNO
// Ensure a 220Ω resistor is used in series with the LED to limit current

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. Can I connect the LED directly to a power source?

   • No, always use a current-limiting resistor to prevent damage to the LED.

2. What happens if I reverse the polarity?

   • The LED will not light up. Prolonged reverse voltage may damage the LED.

3. Can I use the LED with a 12V power supply?

   • Yes, but you must calculate and use an appropriate resistor to limit the current.

4. Why is the LED not as bright as expected?

   • Check the resistor value and ensure the forward current is within the recommended range (20mA).

By following this documentation, you can effectively use the Schematic Green LED in your electronic projects.