CHANZON 3mm Red & Blue Common Anode LED Diode Lights User Manual

1. Introduction

This manual provides essential information and instructions for the CHANZON 3mm Red & Blue Common Anode LED Diode Lights. These LEDs are designed for various electronic projects, including DIY PCB circuits, Arduino, Raspberry Pi, hobby electronics, science experiments, and breadboard applications. Please read this manual thoroughly before use to ensure proper operation and safety.

2. Product Overview

The CHANZON 3mm Red & Blue Common Anode LED Diode Lights are miniature, transparent, round-lens LEDs capable of emitting both red and blue light. Each package contains 100 pieces, suitable for a wide range of electronic projects requiring dual-color indication.

Figure 2.1: A single CHANZON 3mm Red & Blue Common Anode LED Diode Light.

Figure 2.2: The 3mm LED diode emitting red light.

Figure 2.3: The 3mm LED diode emitting blue light.

3. Specifications

Figure 3.1: Dimensional drawing of the 3mm LED diode.

4. Setup

Before connecting the LEDs, ensure you understand their polarity and voltage requirements to prevent damage.

4.1 Polarity Identification

• The CHANZON 3mm Red & Blue LED is a Common Anode (CA) type.
• The longest leg is the Common Anode (+).
• The two shorter legs are the Cathodes (-) for the Red and Blue colors, respectively.

4.2 Current Limiting Resistor Calculation

LEDs require a current-limiting resistor in series to prevent overcurrent and damage. The resistor value can be calculated using Ohm's Law:

R = (Vs - Vf) / I

• R = Resistor value in Ohms (Ω)
• Vs = Supply Voltage (V)
• Vf = Forward Voltage of the LED (Red: 2V-2.2V, Blue: 3V-3.2V)
• I = Desired Forward Current (typically 20mA or 0.02A)

Note: Since the Red and Blue LEDs have different forward voltages, you will need separate current-limiting resistors for each color if you intend to light them independently from the same supply voltage.

4.3 Connection to Circuit

1. Identify the Common Anode (+) and the Cathodes (-) for Red and Blue.
2. Connect the Common Anode (longest leg) to the positive (+) terminal of your power supply.
3. Connect a calculated current-limiting resistor in series with each Cathode (shorter legs).
4. Connect the other end of each resistor to the negative (-) terminal of your power supply or a control pin (e.g., from an Arduino) to switch the LED color on/off.

5. Operating Instructions

Once properly connected with the correct current-limiting resistors, apply power to your circuit.

• To illuminate the Red LED, ensure the Red Cathode is connected to ground (or a low signal from a microcontroller) through its resistor.
• To illuminate the Blue LED, ensure the Blue Cathode is connected to ground (or a low signal from a microcontroller) through its resistor.
• To turn off a color, disconnect its Cathode from ground (or set the microcontroller pin to high impedance/output high).

Caution: Applying voltage directly to the LED without a current-limiting resistor will cause immediate damage to the LED.

6. Maintenance

These LEDs are generally maintenance-free under normal operating conditions.

• Storage: Store LEDs in a dry, cool environment, away from direct sunlight and extreme temperatures. Keep them in their original packaging until ready for use to prevent lead bending and static discharge.
• Handling: Handle LEDs by their body, not by the leads, to avoid bending or breaking. Avoid touching the lens surface to prevent smudges that could affect light output.
• Cleaning: If necessary, gently wipe the LED lens with a soft, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.

Figure 6.1: CHANZON 3mm Red & Blue LED Diode Lights in their original packaging.

7. Troubleshooting

• LED not lighting up:
  • Check polarity: Ensure the Common Anode (longest leg) is connected to positive and the correct Cathode (shorter leg) is connected to negative through a resistor.
  • Verify power supply: Confirm the power supply is providing the correct voltage.
  • Inspect resistor: Make sure the current-limiting resistor is correctly calculated and connected. An open circuit or incorrect value will prevent the LED from lighting.
  • Test LED: Try the LED in a known working circuit or with a simple battery and appropriate resistor to confirm it is not faulty.
• Incorrect brightness or color:
  • Resistor value: Ensure the correct resistor value is used for the specific color (Red or Blue) as their forward voltages differ.
  • Current: Verify that the LED is receiving approximately 20mA of current. Lower current will result in dimmer light.
  • Supply voltage: Fluctuations in supply voltage can affect brightness.
• LED flickering:
  • Loose connections: Check all connections for proper contact.
  • Unstable power supply: Ensure your power supply is stable and not fluctuating.

8. Safety Information

• Always use appropriate current-limiting resistors with LEDs to prevent overcurrent and damage to the LED or power source.
• Avoid direct, prolonged eye exposure to the illuminated LED, especially the blue light, as it can be very bright.
• Do not exceed the specified forward voltage and current ratings.
• Keep out of reach of children. These are small electronic components and can pose a choking hazard.
• Ensure proper ventilation if integrating into an enclosed circuit, although these low-power LEDs generate minimal heat.

9. Warranty and Support

CHANZON products are manufactured to high-quality standards. For any technical assistance, product inquiries, or support, please refer to the seller's contact information or visit the official CHANZON store on Amazon. Please retain your purchase receipt for any warranty claims.