LED Tester

LED Tester
A handy LED and diode testing tool. Use it to easily determine LED polarity, forward voltage, and brightness at various test currents.

LED Tester provides a constant test current and reads out the diode forward voltage. Works with regular LEDs, bi-directional LEDs, Zener diodes, Schottky diodes, silicon diodes, etc. Battery powered with integrated battery, USB Micro charge connector.

Works with a variety of LEDs and diodes

• Conventional LEDs, including IR and UV.
• Bi-directional LEDs. Reads out the forward voltage of both LEDs.
• Schottky, silicon, germanium diodes
• Zener diodes up to 4V

Constant Current Test Settings

• 0.1 mA
• 1 mA
• 2.5 mA
• 5 mA
• 10 mA
• 15 mA
• 20 mA
• 5 mA
• 30 mA
• 40 mA

Three ways to test parts

• Breadboard style socket for leaded parts
• Pads for SMT parts
• Banana jacks for test leads (test leads not included)

Features

• Big easy to read display
• Battery powered (includes internal Li-Ion battery)
• Lighted power switch with automatic shutoff
• Arduino compatible.
• 100% Open Source Technology including electrical, mechanical, and software.
• Ships Fully Assembled and Tested

Operation
Press the power button to toggle power on/off. After 5 minutes of inactivity the device will automatically power off.
The display will show dashes and the polarity indicators will flash when there's no LED or diode present.
Rotate the dial to select the desired test current.
Connect a test LED or diode to the breadboard sockets, SMT pads, or test leads.
The display will show the forward voltage. For bi-color LEDs (bi-directional diodes) the display will alternate.
The illuminated polarity LED indicates the anode (positive) lead of the LED or diode.

Design Documents

Schematic Diagram	schematic_j724_led_tester.pdf
3D Print Files	mechanical_j724_led_tester.zip
PCB Gerbers	gerbers_j724_led_tester.zip
Source Code	code_j724_led_tester.zip

Specifications

Power Requirement	5V Micro USB connector, 650mA maximum
Dimensions	103x103x45 mm (4x4x1.8 in)