LED 5mm

Apply a constant voltage to emit light.

The longer leg is the positive (+) terminal and the shorter one is the negative (-) terminal, so caution is needed when connecting.

Be careful not to supply a voltage higher than the maximum voltage of the product.

Specifications

These are the specifications of the LED discussed in the text. Specifications may vary slightly depending on the manufacturer and model.

Color	Minimum Voltage[V]	Maximum Voltage[V]	Standard Current[mA]	Maximum Current[mA]
Red	1.8	2.3	20	50
Yellow	2	2.8
Green	3	3.6
Blue	3.4	3.8
White	3.4	4

Required Hardware

• LED

• Arduino board

• Jumper cables

Connection

Connect the longer leg through a resistor to a digital pin, and the shorter leg to the Arduino's GND.

You can connect the long legs together to operate from a single digital pin as shown below, or set different digital pins for each LED if you want them to operate separately.

Component	Connection to Arduino	Notes
LED(+)	Connected to Resistor	Resistor limits current to Protect LED
Resistor	Connected to D7 Pin	Recommended to use a resistor between 220Ω and 330Ω
LED(-)	Connected to GND

Example Code

#define led 7 // Use pin 7
#define dly 1000

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

void loop() { // Code for turning on the LED for 1 second intervals
  digitalWrite(led, HIGH);
  delay(dly);
  digitalWrite(led, LOW);
  delay(dly);
}

Execution Result