# Basic Arduino and Parts

# Resistors

A resistor is an electrical component used to create resistance in the flow of an electrical current. The amount of resistance a resistor has is measured in ohms. Resistors are important as supply too much voltage to a component you can completely destroy it. Resistors can be used to prevent this with just a little bit of math.   
  
To make calculations easier, I have linked 2 tools to help you calculate exactly what you need and what you have.

[https://ohmslawcalculator.com/ohms-law-calculator](https://ohmslawcalculator.com/ohms-law-calculator)

[https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code](https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code)

**Read the color bands from left to right.** The colors on the first 2 or 3 bands correspond to numbers from 0 to 9, which represent the significant digits of the resistor's ohmic value. The last band gives the multiplier. For example, a resistor with brown, green and green bands is rated at 15 mega-ohms (15,000,000 ohms). The code is as follows:<sup class="reference" id="bkmrk-%5B2%5D">[\[2\]](https://www.wikihow.com/Identify-Resistors#_note-2)</sup>

- Black: 0 significant digit, multiplier of 1
- Brown: 1 significant digit, multiplier of 10
- Red: 2 significant digit, multiplier of 100
- Orange: 3 significant digit, multiplier of 1,000 (kilo)
- Yellow: 4 significant digit, multiplier of 10,000 (10 kilo)
- Green: 5 significant digit, multiplier of 100,000 (mega)
- Blue: 6 significant digit, multiplier of 1,000,000 (10 mega)
- Violet: 7 significant digit
- Gray: 8 significant digit
- White: 9 significant digit
- Gold: multiplier of 1/10
- Silver: multiplier of 1/100

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/KFHimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/KFHimage.png)

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/YZpimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/YZpimage.png)

# Arduino Board and Parts

## Arduino Board

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/lzRimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/lzRimage.png)

## Parts

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/iGkimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/iGkimage.png)

### **Sample Projects**

[Arduino - LED - Blink | Arduino Tutorial (arduinogetstarted.com)](https://arduinogetstarted.com/tutorials/arduino-led-blink)

[Arduino - Button | Arduino Tutorial (arduinogetstarted.com)](https://arduinogetstarted.com/tutorials/arduino-button)

[Arduino - Button | Arduino Tutorial (arduinogetstarted.com)](https://arduinogetstarted.com/tutorials/arduino-button)

[Arduino - RGB LED | Arduino Tutorial (arduinogetstarted.com)](https://arduinogetstarted.com/tutorials/arduino-rgb-led)

# LED

### **LED**

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/6zdimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/6zdimage.png)

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/8zSimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/8zSimage.png)

# Push Buttons

### **Push Buttons**

![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/yfwimage.png)

There are four ways (actually two because of symmetry) to connect to buttons. You can only use two at a time:

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/FjKimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/FjKimage.png)

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/criimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/criimage.png)

[![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/HGiimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/HGiimage.png)