Virtual Labs

To simulate interfacing of basics input components (pushbutton, potentiometer, slider switch and photoresistor) with Arduino

1. Explain how a pull-down resistor helps in stable button readings.

a: It keeps the pin at LOW when button is not pressed. Explanation

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b: It increases the button sensitivity. Explanation

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c: It makes the button work without wiring. Explanation

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d: It prevents power consumption. Explanation

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2. Why does a potentiometer produce varying voltage?

a: Because it changes resistance as you rotate the knob. Explanation

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b: Because it contains internal sensors. Explanation

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c: Because it generates voltage. Explanation

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d: Because it has multiple output pins. Explanation

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3. How can we convert LDR analog readings into percentage light intensity?

a: By mapping analog values (0–1023) to 0–100%. Explanation

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b: By dividing the reading by 2. Explanation

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c: By converting it to digital values. Explanation

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d: By reading only HIGH or LOW. Explanation

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4. Write the difference between slider switch and pushbutton.

a: Slider stays in position while pushbutton is momentary. Explanation

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b: Both are momentary switches. Explanation

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c: Slider gives analog output while pushbutton gives digital. Explanation

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d: Pushbutton is ON/OFF while slider is analog. Explanation

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5. How can debouncing be handled in pushbutton applications?

a: Using delay() or software logic filtering. Explanation

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b: By pressing the button slowly. Explanation

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c: By reducing the voltage. Explanation

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d: By using analog pins. Explanation

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6. How does Arduino process analog values internally?

a: It uses a 10-bit ADC to convert voltage into numbers 0–1023. Explanation

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b: It directly reads voltage without conversion. Explanation

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c: It converts analog into digital only at HIGH/LOW. Explanation

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d: It stores analog values in EEPROM. Explanation

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7. Suggest an application where potentiometer input can be practically used.

a: Volume control or brightness adjustment. Explanation

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b: Internet speed measurement. Explanation

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c: Temperature sensing. Explanation

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d: GPS location tracking. Explanation

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8. Explain why LDR is preferred in automatic lighting systems.

a: Because it changes resistance based on light level. Explanation

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b: Because it detects temperature. Explanation

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c: Because it produces sound. Explanation

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d: Because it stores electrical energy. Explanation

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9. How would you detect long press vs short press in simulation?

a: By measuring how long the button stays pressed using millis(). Explanation

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b: By checking analog value. Explanation

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c: By using PWM pins. Explanation

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d: By using only delays. Explanation

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10. How can you display potentiometer values in Serial Monitor?

a: By using analogRead() and Serial.println(). Explanation

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b: By using digitalWrite(). Explanation

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c: By using tone(). Explanation

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d: By using delay() only. Explanation

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