ArduTester v1.08k OLED

Electronic project for use an Arduino Nano as an electronics components identifier.
Schematics diagram + PCB diagram (KiCAD 9) and case 3D model (Blender) are also provided.

This project is a work-in-progress.

Based on the well-known TransistorTester work of Karl-Heinz Kübbeler.

Useful links:

• TransistorTester oficial GitHub
• Mikrocontroller.net
• Mikrocontroller.net GitHub

Aditional resources:

• Electgpl@YouTube.com: Video tutorial: ArduTester + OLED display [spanish]
• ElProfeGarcia@YouTube.com: Video tutorial: ArduTester component tester [spanish]
• Electronoobs@YouTube.com: Video tutorial: component test with Arduino + TFT display [spanish]
• Electronoobs.com blog [spanish]
• BawejaAkshay@Instructables.com: ArduTester version #1
• BawejaAkshay@Instructables.com: ArduTester version #2
• Lithium-Ion@Hackster.io blog
• RiverTrue@DFRobot.com blog
• Plouc68000@ProjectHub.arduino.cc blog
• ChristianIhle@GitHub.com blog

This project comes in two versions: standard (current) and extended (planned). See features bellow.

Features:

• One-key-operation.
• Three test pins for universal use.
• Automated detection of pin assignment, this means the device-under-test can be connected to the tester in any order.

Supported components:

• Diodes, LEDs and Zeners.
  • Diodes will also be displayed with their correctly aligned symbol, pin number, voltage drop, the parasitic capacitance and reverse current will also be measured.
• Transistors NPN/PNP BJT, JFET, N-channel/P-channel MOSFET.
  • Measurement of hFE and base-emitter-voltage for bipolar junction transistors, also for Darlingtons.
  • Automated detection of protection diodes in bipolar junction transistors and MOSFETs.
  • Bipolar junction transistors are detected as a transistor with a parasitic transistor (NPNp = NPN + parasitic PNP).
• Resistors will be measured with a resolution down to 0.1 ohm.
  The measurement range is up to 50 Mohm (Megaohm).
  Resistors below 10 ohm will be measured with the ESR approach and a resolution of 0.01 ohm.
• Capacitors in the range 35pF (picofarad) to 100mF (millifarad) can be measured with a resolution down to 1 pF.
  • Measurement of ESR (Equivalent Series Resistance) of capacitors greater than 20 nF is built in.
  • Vloss of capacitors greater 5 nF is examined. With this it is possible to estimate its Q-factor.
• Resistors and capacitors will be displayed with their respective symbol, pin number and value.
• Inductances of 0.01 mH to 20 H can be detected and measured.
• Small Thyristors and TRIACs.

Notes:

• Be sure to discharge capacitors before measure it. Existing voltage can damage your Arduino.

The standard version uses the following electronic components:

• 1 x Arduino Nano v3
• 1 x OLED display 0.96" 128x64 I2C
• 3 x 680 ohm resistor
• 3 x 470k ohm resistor
• 1 x Push switch button
• 1 x 10k ohm resistor
• 1 x Socket connector 5-pins
• 1 x Bornier connector 2-pins / JST connector 2-pins
• 1 x Bornier connector 3-pins / JST connector 3-pins
• 1 x Bornier connector 4-pins / JST connector 4-pins
• Wires

Breadboard	Assembly

Assembly	Assembly

Schematics Diagram	PCB Diagram

PCB Render 3D	PCB Render 3D

Case 3D Model	Project Final

Project Final	Project Final

See 'Resources' sub-folder for more pictures & videos of the project.

v1.0 (2026.01.04) - Initial release.
v1.1 (2026.01.05) - Added schematics and PCB diagrams.
v1.2 (2026.01.05) - Added 3D case model.
v1.3 (2026.01.06) - Firmware and PCB fixes.
v1.4 (2026.01.06) - 3D case model fixes.
v1.4 (2026.01.06) - Minor case 3D model fixes.
v1.5 (2026.01.09) - Minor fixes on PCB.
v1.6 (2026.01.14) - Minor fixes on PCB.
v1.7 (2026.01.16) - Re-design of PCB and 3D case model.
v1.8 (2026.02.03) - Minor cases 3D model fixes.
v1.9 (2026.02.04) - Added gadget images & video.

This source code is licensed under GPL v3.0
Please send me your feedback about this project: andres.garcia.alves@gmail.com