Wheatstone Bridge Ohm Meter
Electrical
Beginner
Arduino Uno
Arduino C++
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)
