Arduino IC Tester for 74-Series Logic

Faulty or mislabeled logic ICs are a routine frustration in digital-electronics labs — a single bad gate can waste an entire practical session, and beginners have no way to check a chip before wiring it into a circuit. This project gives the student a bench instrument that does exactly that check. An Arduino Mega drives the pins of the chip under test through a ZIF socket, steps through every input combination, and compares each observed output with the device's truth table stored in firmware. A 16x2 LCD reports the device type, the combination under test, and the final PASS/FAIL verdict. Along the way the build teaches pin driving, truth-table encoding, test sequencing and pass/fail reporting — and produces a genuinely useful lab tool.

1. The student plugs the chip under test into the ZIF socket and selects the device type (e.g. 74HC00) with the selector.
2. The firmware configures each Arduino Mega pin as input or output according to the selected device's pinout.
3. For every row of the stored truth table, the Arduino drives the inputs to the required levels.
4. After each drive step the firmware reads the chip's outputs and compares them with the expected truth-table values.
5. The LCD shows live progress (device, combination number) and at the end reports PASS, or FAIL with the failing combination.
6. The report documents the test procedure, the supported device list, and the method for adding new devices to the database.

Tech stack:

• Arduino Mega 2560 (ATmega2560)
• ZIF test socket
• 16x2 character LCD (HD44780)
• Arduino IDE (C/C++ firmware)
• 74HC series logic ICs
• Breadboard/perfboard assembly

• [Truth-table verification] The firmware stores the complete truth table of each supported device and drives every input combination, comparing each output — a full functional test, not a spot check.
• [ZIF test socket] The chip under test plugs into a zero-insertion-force socket, so devices are swapped in seconds without bent pins — the same socket style used in professional programmers.
• [Five 74HC devices supported] Truth-table data is included for the 74HC00 (NAND), 74HC04 (inverter), 74HC08 (AND), 74HC32 (OR) and 74HC02 (NOR) — the devices students meet first.
• [PASS/FAIL LCD reporting] A 16x2 LCD shows the selected device, the combination being tested, and the final PASS or FAIL verdict with the failing combination identified.
• [Device selection] A selector switch or button cycles through the supported device types, reconfiguring pin roles and truth tables automatically.
• [Arduino Mega pin capacity] The Mega's large GPIO count drives all 14 pins of a device under test directly, with no shift registers or expanders in the path.
• [Student-extendable database] Adding a new device means entering its pinout and truth table in one clearly-commented firmware section — documented as a viva exercise.

• Working Arduino IC tester prototype with ZIF socket
• Arduino Mega firmware with five-device truth-table database
• Schematic and wiring documentation
• Truth-table data sheets for the supported devices
• Procedure for adding new devices to the firmware
• Project report PDF (digital logic testing, methodology)
• PPT presentation for final review
• Viva Q&A preparation document

• Functional testing only at DC static levels — propagation delay, rise time and switching speed are not measured.
• Supports the five 74HC devices in firmware; other devices need their pinout and truth table added by the student (documented procedure).
• Only 5 V logic families can be tested; 3.3 V or other-voltage parts are out of scope.
• 14-pin DIP packages only in the shipped ZIF socket; other packages need an adapter.
• It verifies logic function, not parametric specs like input leakage or output drive current.