Maker Tools

Quick interactive utilities to help you build Arduino projects faster.

Resistor Color Code Calculator

Pick 4- or 5-band colors and read the value in Ω / kΩ / MΩ live.

Hover any pin to learn its function, voltage and a quick wiring example.

Pick a sensor + output and get a ready-to-upload Arduino sketch.

Visualize how sensor data flows from Arduino to your screen.

Solve for Voltage, Current, Resistance and Power using V = I × R.

Find the safe series resistor for any LED + supply voltage.

Step-by-step quiz that recommends the right sensor for your idea.