Arduino Electronic Component Tester with 16×2 LCD | DIY Project
[Sekhohub.online]
Build an Arduino-based electronic component tester to identify resistors, capacitors, diodes, and transistors. Display results on a 16×2 LCD. A perfect DIY project for electronics hobbyists and repair technicians.
Introduction
Testing individual electronic components is crucial for both designing circuits and troubleshooting faults. In this project, we’ll build a DIY electronic component tester using Arduino Uno and a 16×2 LCD display. This tester can identify and measure resistors, capacitors, diodes, transistors, and more!
Materials for the Project
- 1x ARDUINO UNO
- 1x 16X2 LCD
- 1x PUSH BUTTON
- 1x 10K VARIABLE RESISTOR
- 3x 680 OHM RESISTORS
- 3x 470K RESISTORS
- 1x nF CAPACITOR
- MALE HEADERS
- 1x 3-PIN TERMINAL BLOCK
- FEMALE HEADERS
- VERO BOARD
- JUMPER WIRES
- USB Cable + 5V Power Supply
Download Circuit Diagram
Circuit Diagram
Download Arduino Code
Arduino Code
⚙️ Working Principle
This Arduino-based tester works by:
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Sending known voltages/currents through the component
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Measuring response (voltage drop, time constants, etc.)
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Identifying the type of component and calculating values (like resistance or capacitance)
Results are displayed in real-time on the 16×2 LCD screen.
Video Tutorial
Features
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Tests Resistors, Capacitors, Diodes, NPN/PNP Transistors
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Easy to build with common parts
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Can be upgraded with rotary encoders or TFT LCD
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Ideal for electronics learners, repair technicians, or hobbyists
Expandability Ideas
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Add support for MOSFETs, Zener Diodes, or inductors.
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Upgrade LCD to I2C version for fewer pins
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Add auto power-off feature or battery supply