OhmBridge — Wheatstone Bridge Resistance Analyzer

About this project

OhmBridge is a Wheatstone bridge resistance analyzer built on Arduino Uno that measures an unknown resistor (Rx) by comparing it against a precision 10 kΩ reference arm. The bridge is formed by three fixed 10 kΩ resistors and the unknown Rx; Arduino reads both bridge midpoint voltages on A0 and A1, computes Rx using the voltage divider inversion formula, and displays the result on a 0.96-inch SSD1306 OLED in large text alongside bridge voltage and balance status. A green LED and buzzer chirp when the bridge reaches balance (Rx ≈ 10 kΩ); a red LED indicates imbalance with direction (Rx HIGH or Rx LOW). BTN_HOLD freezes the current reading for note-taking.

What you get

• Complete, commented source code
• Full components list with quantities
• Pin-by-pin wiring guide and connection table
• Step-by-step upload and testing guide
• Project report (.docx, IEEE style)
• Presentation slides (.pptx)