This is a short tutorial on the usage of 7 and 8 segment LED displays.
For this tutorial you will require:
A Bread Board
230 Ohm Resistors
A 7 or 8 segment LED display
NOTE: All of the above components (and more) can be found in a convenient kit at this link:
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Step 1: Resistors
Place once resistor for each segment in your display. Resistors are used on the hot (positive) side of the display so that the display will not change in brightness when multiple segments are lit.
Step 2: Wiring
The central pins on each end of the display are the ground pins.
NOTE: only one pin needs to be grounded, I grounded both so they are visible.
Next run jumper wires from digital pins 2 through 9 (2 through 8 if your display only has 7 LEDs) to one side of the resistors and a second set of jumper wires to the input pins of the display.
NOTE: The polarity (current direction) of the resistors is not important, as the resistance is equivalent both ways.
Step 3: Pin Order
The Arduino code above cycles through each pin from 2 to 9 one at a time to show the pin order. Adjust the wiring so that the pattern matches the Gif above.
Step 4: Numbers
The above code cycles the numbers 0 through 9 on the display to ensure that everything is wired correctly.
Feel free to borrow the code for each numeral for other projects (just make sure to give credit in your instructables).
Step 5: Serial Control
This program will display any numeral (0 to 9) sent to the Arduino over serial communication. Send any other character to clear the screen.
If you have any questions or comments feel free to ask them below or private message me.
Have a great day!