Speed Adjustable LED Blink

This is an introductory project for working with the Arduino UNO. The end result of this project is a police-light like pair of LEDs with an adjustable blinking speed.

Required materials:

- Arduino UNO

- Two LEDs, any color (I used red and blue)

- 10 Kohm Potentiometer

- Two 220 ohm resistors

- Momentary push button

- One 1 Mohm resistor

- Wires

- Breadboard

Step 1: LED and Grounding

1: Wire the (-) side of the breadboard to the gnd pin on the Arduino

2: Add LED to circuit, connect (+) to pin 8 on Arduino digital side

3: Connect a 220 ohm resistor from the (-) side of the LED to ground (negative side of board)

Step 2: Second LED

Add second LED and resistor connected to pin 9

Step 3: Potentiometer for Speed Control

1: Add 10k potentiometer

- Top pin connect to (+) side of breadboard

- Middle pin connect to pin A0 on Arduino

- Bottom pin connect to ground

Step 4: Button

1: Add button to breadboard so that the pins are all in separate groups

- Top left pin connected to (+) of breadboard

- Bottom left pin connected to ground

- Bottom right pin connected to pin 11 on digital side of Arduino

2: Connect (+) side of breadboard to 5v pin on Arduino

Step 5: Coding

Download code and load to Arduino

- Press button for 1 second and release to start/stop

- Adjust potentiometer to control blink rate