3mm White Red LED (Pack of 10)

3mm White Red LED (Pack of 10) Documentation

Overview

The 3mm White Red LED (Pack of 10) is a versatile and compact light-emitting diode (LED) component suitable for a wide range of Internet of Things (IoT) projects. This LED emits white and red light, making it ideal for indicator lights, signal lights, or decorative lighting applications.

Technical Specifications

LED Type: 3mm White Red LED
 Package: Pack of 10
 Voltage: 2.0-2.4V (typical)
 Current: 20mA (typical)
 Luminous Intensity: 100-150 mcd (white), 50-70 mcd (red)
 Viewing Angle: 60
 Operating Temperature: -20C to 80C

Hardware Connections

The 3mm White Red LED has two pins:

Anode (Positive): Longer leg
 Cathode (Negative): Shorter leg

Code Examples

### Example 1: Simple LED Blinking using Arduino

In this example, we'll demonstrate how to connect the 3mm White Red LED to an Arduino board and make it blink.

Hardware Requirements

Arduino Board (e.g., Arduino Uno)
 3mm White Red LED (Pack of 10)
 220 Resistor
 Breadboard
 Jumper Wires

Software Requirements

Arduino IDE

Code
```c++
const int ledPin = 13;  // Choose any digital pin on your Arduino board

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);  // Turn the LED on (white light)
  delay(500);
  digitalWrite(ledPin, LOW);   // Turn the LED off
  delay(500);
  digitalWrite(ledPin, HIGH);  // Turn the LED on (red light)
  delay(500);
  digitalWrite(ledPin, LOW);   // Turn the LED off
  delay(500);
}
```
Explanation

In this example, we connect the anode of the LED to digital pin 13 of the Arduino board through a 220 resistor. We then use the `digitalWrite()` function to set the pin high or low to turn the LED on and off, respectively. The LED will blink with a 500ms interval, switching between white and red light.

### Example 2: LED Dimming using Raspberry Pi and Python

In this example, we'll demonstrate how to connect the 3mm White Red LED to a Raspberry Pi and control its brightness using Python.

Hardware Requirements

Raspberry Pi (e.g., Raspberry Pi 3)
 3mm White Red LED (Pack of 10)
 1k Resistor
 Breadboard
 Jumper Wires

Software Requirements

Raspbian OS
 Python 3.x

Code
```python
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)  # Choose any GPIO pin on your Raspberry Pi

pwm = GPIO.PWM(18, 50)  # 50 Hz frequency
pwm.start(0)  # Initial duty cycle: 0%

while True:
    for dc in range(0, 101, 5):  # Dim the LED from 0% to 100% duty cycle
        pwm.ChangeDutyCycle(dc)
        time.sleep(0.1)

for dc in range(100, -1, -5):  # Dim the LED from 100% to 0% duty cycle
        pwm.ChangeDutyCycle(dc)
        time.sleep(0.1)
```
Explanation

In this example, we connect the anode of the LED to GPIO pin 18 of the Raspberry Pi through a 1k resistor. We then use the RPi.GPIO library to create a PWM (Pulse-Width Modulation) signal on the pin, which allows us to control the brightness of the LED. The LED will gradually dim and brighten with a 100ms interval.

Note: These examples are for demonstration purposes only and may require modifications to suit your specific project requirements.