This is a compact, lightweight component tester powered by an Arduino Nano, designed for quick and practical electronics diagnostics. It can run from either USB or a DC jack, making it flexible for both bench use and field work. Components can be tested either by inserting them directly into the onboard connectors or by using cable attachments through the terminal block for larger parts.

The device identifies and tests common components such as resistors, LEDs, transistors, and capacitors, with results displayed clearly on a small OLED screen. A single-button interface keeps operation simple while reducing cost and complexity, making the build affordable and easy to replicate.

All resistors are deliberately placed beneath the MCU and OLED to achieve a cleaner, more streamlined layout. The reistors can also be mounted on the bottom side when repairability is a priority.

It’s an ideal tool for students, hobbyists, and technicians who need a portable, low-cost way to verify electronic parts on the go.