Yellow LED

Image courtesy of SparkFun Electronics

An average 5mm Yellow LED has a 2V forward voltage drop, and a forward current of 20mA. Bright Yellow LEDs can have a forward voltage as high as 3.4V – check the datasheet. Don’t forget to use a current-limiting resistor when you connect an LED to your Arduino!

Buy yellow LEDs from Amazon, SparkFun, Adafruit, or Newark.