1. CTY SAR FCPS Shawn Lupoli, Elliot Tan
Arduino LED Lab
CTY SAR FCPS
Shawn Lupoli, Elliot Tan

2. Let’s learn a bit about the parts we will be using…

3. Ohm’s Law Voltage = Current * Resistance  V = IR Voltage Current
Electric potential difference
Measured in Volts (V)
Current
Flow of electric charge
Measured in Amperes (I)
Resistance
Conductor’s opposition to passage of
electric current
Measured in Ohms (Ω)

4. Reading Resistors

5. Example Problems

6. For a quick answer
calculators/conversion-calculator-resistor-color-code-4-band
Make sure to select how many colored bands there are on the resistor
If the URL has changed, please let your instructional staff know

7. Programming “Blink”

8. Overall Structure Global variables Void setup() { } Void loop() { }
This function is called when a sketch starts
Used to initialize variables, pin modes, and start using library
Will only run once
Void loop() { }
Loops consecutively
Allows your program to change and respond

9. Blink: Part 1 Initializing global variables Setup()
The LED will be connected to pin 13, so initialize a global variable
“ int led = 13 “
Setup()
pinMode(pin, mode) configures the pin to behave either as an input or an output
Initialize the digital pin 13 as output using function

10. Blink: Part 2 Loop() Functions Examples
digitalWrite(pin, MODE) – HIGH enables voltage, LOW will disable voltage
delay(int x) – Pauses the program for the amount of time in milliseconds
Examples
digitalWrite(13, High);
Delay (1000)

11. CODE

12. Building the LED circuit

13. Supplies 1 Arduino board 1 breadboard
4 long wires (one red, one black)
1 LED
1 resistors (330 kΩ)
* Notes:
Wires are 22 or 24 AWG, solid
Short wires = 5 cm
Medium wires = 12 cm
Long wires = 16 cm

14. Wiring the LED correctly

15. Diagram of LED circuit

16. Connecting Code and Circuit

17. Putting it All Together
UPLOAD!
Remember to check for the flashing RX and TX lights, and a “Successful upload” message in your console
Understanding the process
Since pin 13 is initialized as output, your computer tells the circuit what the do through pin 13
Turning on the LED, waiting, turning off the LED, waiting
The switches will open and close the circuit, allowing the LEDs to either blink or not blink

18. Questions?