Virtual Labs

Write a program to control an LED brightness by generating a PWM signal on PIC18 series microcontroller

1) The Timer2 module in PIC18F4550 supports which of the following modes?

a: Timer mode only Explanation

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b: Counter mode only Explanation

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c: Both Timer and Counter modes Explanation

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d: PWM mode only Explanation

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2) Which register is used to configure the Timer2 prescaler value in PIC18F4550?

a: T2CON Explanation

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b: TMR2 Explanation

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c: PR2 Explanation

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d: T2CKPS Explanation

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3) What is the maximum value that can be loaded into the PR2 register for Timer2 in PIC18F4550?

a: 255 Explanation

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b: 65535 Explanation

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c: 1023 Explanation

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d: 4095 Explanation

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4) Which pin(s) on the PIC18F4550 can be used to generate the PWM signal?

a: RA0 Explanation

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b: RB1 Explanation

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c: RC2 Explanation

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d: All of the above Explanation

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5) Which Timer2 mode allows for the generation of a PWM signal in PIC18F4550?

a: Timer mode Explanation

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b: Counter mode Explanation

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c: Capture mode Explanation

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d: PWM mode Explanation

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6) In PWM, the duty cycle represents:

a: The time period of the PWM signal Explanation

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b: The voltage level applied to the LED Explanation

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c: The ratio of ON time to the total time period of the PWM signal Explanation

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d: The frequency of the PWM signal Explanation

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7) What is the benefit of using PWM for LED brightness control compared to directly varying the voltage applied to the LED?

a: PWM reduces power consumption Explanation

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b: PWM increases LED lifespan Explanation

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c: PWM provides smoother brightness control Explanation

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d: PWM eliminates the need for a microcontroller Explanation

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8) Can the brightness of an LED be controlled using PWM on any microcontroller?

a: Yes, all microcontrollers support PWM. Explanation

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b: No, only specific microcontrollers have built-in PWM capability. Explanation

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c: Only with additional hardware components. Explanation

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d: It depends on the LED's specifications. Explanation

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9) How can the duty cycle of a PWM signal be adjusted to control the LED brightness?

a: By changing the frequency of the PWM signal Explanation

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b: By adjusting the voltage applied to the microcontroller Explanation

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c: By modifying the program code Explanation

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d: By using external resistors Explanation

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10) What are the advantages of using a microcontroller-based approach for PWM LED brightness control?

a: Flexibility in adjusting brightness levels Explanation

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b: Precise control over brightness changes Explanation

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c: Ability to integrate with other sensors or systems Explanation

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d: All of the above Explanation

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