Table
| Process Step | Potential Failure Mode | Potential Failure Effect | Severity $S$ | Occurrence $O$ | Detectability $D$ | RPN $S \times O \times D$ | Action Recommended | Notes |
|---|---|---|---|---|---|---|---|---|
| Power Supply | Power Supply Failure | Loss of power to the entire circuit | 9 | 3 | 4 | 108 | Add redundancy, use a reliable power source | Check power ratings |
| Microcontroller | MCU Overheats | MCU damage, system shutdown | 8 | 2 | 3 | 48 | Add heat sink, improve ventilation | Monitor temperature |
| Communication Bus | Data Transmission Error | Data loss, communication failure | 7 | 3 | 5 | 105 | Implement error checking/correction techniques | Use shielded cables |
| Sensor Input | Incorrect sensor readings | Incorrect system response | 8 | 4 | 6 | 192 | Calibrate sensors, add filtering | Perform regular calibration |
| Power Regulation | Voltage Regulator Failure | Incorrect operating voltage | 9 | 2 | 5 | 90 | Use quality regulators, add over-voltage protection | Check voltage regularly |
| PCB Layout | Short Circuit | Component damage, system failure | 10 | 2 | 7 | 140 | Proper PCB design, add fuses | Inspect layout & clearances |
| User Interface | Button Failure | User input not registered | 6 | 3 | 4 | 72 | Use robust buttons, debounce circuits | Regular interface testing |
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