Raspberry Pi - PWM Output
Why can't Raspberry Pi GPIO pins output true analog voltage, and how does PWM overcome this limitation?
Why can't Raspberry Pi GPIO pins output true analog voltage, and how does PWM overcome this limitation?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand GPIO pin voltage output
Raspberry Pi GPIO pins can only output digital signals: ON (3.3V) or OFF (0V), no true analog voltage.Step 2: Understand PWM as analog simulation
PWM rapidly switches the pin ON and OFF with varying ON time (duty cycle), making devices behave as if receiving analog voltage.Final Answer:
GPIO pins are digital only; PWM simulates analog by fast switching ON/OFF -> Option CQuick Check:
GPIO digital only + PWM simulates analog [OK]
Quick Trick: PWM simulates analog voltage by fast ON/OFF switching [OK]
Common Mistakes:
- Thinking GPIO pins output analog voltage
- Confusing PWM with power saving
- Assuming PWM changes voltage level directly
Master "PWM Output" in Raspberry Pi
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