TCS Pune

I²C scanner and bus faults

Guided diagnostic

I²C scanner and bus faults

Scan addresses and diagnose stuck SDA/SCL or missing acknowledgements.

Medium riskArduino, ESP, PIC, AVR, STM32 and RP boards

Tools checklist

  • Digital multimeternUSB data cablenCurrent-limited bench supplynLogic analyser or oscilloscope when indicated

Symptom-to-checkpoint workflow

Start at checkpoint 1. Record the reading, then choose Pass or Fail to follow the correct branch.

Checkpoint 1 · Idle levels

Method: Measure SDA and SCL while idle

Expected: Both lines are HIGH at valid voltage

⚠ Pull-ups must go to the correct logic rail.

Record this diagnostic run

Log in to save measurements and submit this run to an instructor.

Bench safety

Disconnect power before wiring changes or continuity testing. Confirm polarity and voltage limits. Use a current-limited supply for suspected shorts.

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