How to Use Yellow LED Module: Examples, Pinouts, and Specs

A Yellow LED Module is a light-emitting diode that emits yellow light when an electric current passes through it. It is commonly used in electronic projects for indicators and displays. This module is a versatile component that can be easily integrated into various circuits, making it a popular choice for both hobbyists and professionals.

1. Identify the Pins: The Yellow LED Module has two pins: Anode (positive) and Cathode (negative). The longer pin is typically the Anode, and the shorter pin is the Cathode.
2. Connect to Power Source: Connect the Anode to the positive terminal of the power source (Vcc) and the Cathode to the negative terminal (GND).
3. Use a Current-Limiting Resistor: To prevent damage to the LED, use a current-limiting resistor in series with the Anode. The value of the resistor can be calculated using Ohm's Law: [ R = \frac{V_{supply} - V_{forward}}{I_{forward}} ] For example, if using a 5V supply and the forward voltage of the LED is 2.1V, and the forward current is 20mA: [ R = \frac{5V - 2.1V}{0.02A} = 145\Omega ] A 150Ω resistor is a common choice.

• Polarity: Ensure correct polarity when connecting the LED. Reversing the connections can damage the LED.
• Current Limiting: Always use a current-limiting resistor to prevent excessive current from flowing through the LED.
• Heat Management: While LEDs are efficient, they can still generate heat. Ensure adequate ventilation if using multiple LEDs or high currents.

Arduino UNO
+5V  ----->|---- 150Ω ----> Anode (Yellow LED)
GND  ----------------------> Cathode (Yellow LED)

// Define the pin for the Yellow LED
const int ledPin = 13;

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

void loop() {
  // Turn the LED on (HIGH is the voltage level)
  digitalWrite(ledPin, HIGH);
  delay(1000); // Wait for a second

  // Turn the LED off by making the voltage LOW
  digitalWrite(ledPin, LOW);
  delay(1000); // Wait for a second
}

1. LED Not Lighting Up:

   • Check Polarity: Ensure the Anode is connected to the positive terminal and the Cathode to the negative terminal.
   • Check Connections: Verify all connections are secure and correct.
   • Check Resistor: Ensure a current-limiting resistor is used and is of the correct value.

2. LED Flickering:

   • Power Supply Stability: Ensure the power supply is stable and not fluctuating.
   • Loose Connections: Check for any loose or intermittent connections.

3. LED Dim:

   • Insufficient Current: Ensure the current-limiting resistor is not too high, reducing the current below the required level.
   • Power Supply Voltage: Verify the power supply voltage is adequate for the LED's forward voltage.

• Double-Check Connections: Always double-check your circuit connections before powering up.
• Use a Multimeter: Use a multimeter to check the voltage and current in the circuit to ensure they are within the specified range.
• Test with a Known Good LED: If troubleshooting fails, test with a known good LED to rule out a faulty component.

By following this documentation, users should be able to effectively integrate and troubleshoot the Yellow LED Module in their electronic projects.