In this video, Zahraa goes over one of the components used with the Arduino board: light-emitting diode (LED). She also examines the anode and cathode leads of the LED and explains the current limiting resistor used with LED when connecting it to Arduino.
- [Instructor] A light emitting diode,…as the name says it, is a diode that emits light.…Basically, LEDs are just tiny light bulb…that fits easily into an electrical circuit.…A diode is a device that allows current…to flow in only one direction.…LEDs have polarity, which means they will only light up…if you orient the legs properly.…This is the LED schematic symbol,…anode for the positive side…and cathode for the negative side.…
There's normally no label on the case to identify the leads.…The leads are identified by either the difference in length,…so the longer one is the anode…and the shorter one is the cathode.…Another way to identify the cathode terminal…is by either a notch or a flat spot on the case,…so the lead closest to the flat area is the cathode pin.…In any practical application…an LED requires the use of a resistor.…
The resistors there is to ensure…that the maximum current rating…of the LED will not be exceeded.…The way we use the LED in our circuit is by adding it…as a certain series to it.…The resistor is called a current limiting resistor.…
- What's an Arduino?
- Creating an Arduino program
- Using the setup() and loop() functions
- Using the pinMode() and digitalWrite() commands
- Creating your first sketch
- Writing code to turn LEDs on and off
- Wiring a pushbutton to Arduino
- Activating an LED with a pushbutton
Skill Level Beginner
Learning Arduino: Pulse Width Modulationwith Rae Hoyt1h 16m Intermediate
Learning Arduino: Interfacing with Hardwarewith Zahraa Khalil1h 40m Intermediate
1. Introduction to Arduino
2. Creating an Arduino Program
3. Interface with Ouptut: LED
4. Interface with Input: Pushbutton
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