RESISTOR COLOR CODE CALCULATOR

The Resistor Color Code Calculator is an Arduino Nano based project used to identify the resistance value of a resistor using its color bands.

The user selects the resistor colors using two push buttons. The selected colors are displayed on a 16×2 LCD, and the Arduino calculates and displays the corresponding resistance value.

This project is useful for learning about resistor color codes, Arduino programming, LCD interfacing, and push-button input.

Deshbot shield

uno nano

lcd (16x 2)

button (inbuild in shield)

LCD Connections

LCD PinArduino Nano

RS - A4

EN- A3

D4 - A2

D5 - A1

D6 - A0

D7 - D13

RW - GND

VSS - GND

VDD - 5V

Push Button Connections

ButtonArduino Nano

NEXT Button - D10

SELECT Button - D12

Other side of both buttons - GND

The buttons use the Arduino's internal pull-up resistors, so external pull-up resistors are not required.

A resistor has colored bands that represent numerical values.

The first two bands represent the first two digits of the resistance value, while the third band represents the multiplier.

For example:

BROWN – BLACK – RED

1. Brown = 1
2. Black = 0
3. Red = ×100

Therefore:

10 × 100 = 1000 Ω

So the resistor value is:

1 kΩ

ColorValue

Black - 0

Brown - 1

Red - 2

Orange - 3

Yellow - 4

Green - 5

Blue - 6

Violet - 7

Grey - 8

White - 9

The Resistor Color Code Calculator demonstrates how an Arduino Nano can be used to convert resistor color bands into a resistance value.

With only two buttons and a 16×2 LCD, the user can select the resistor colors and obtain the calculated resistance value. The project combines basic electronics knowledge with Arduino programming and LCD interfacing.