Embedded system Quiz

What is the function of a timer in microcontroller applications?

• • To measure time intervals

• • To generate PWM signals

• • To synchronize multiple devices

• To control memory access

Answer explanation

Explanation: Timers in microcontrollers are used to measure time intervals, generate precise delays, and trigger events at specific time intervals.

Which of the following ADC resolutions provides higher precision?

• • 8-bit

• 10-bit

• • 12-bit

• 16-bit

Answer explanation

The resolution of an ADC determines the number of possible digital values it can output. Higher resolutions, such as 16-bit, provide more precision and can represent a wider range of analog values with greater accuracy.

How does a microcontroller differ from a microprocessor?

• Microcontrollers have built-in memory and peripherals

• • Microprocessors are more power-efficient

• • Microcontrollers have higher clock speeds

• • Microprocessors are used in embedded systems

Which of the following factors can affect the accuracy of ADC conversio

• • Input voltage range

• • Clock frequency

• • Temperature variations

• • All of the above

What is the role of the watchdog timer in battery-powered devices?

• • To conserve power by reducing clock frequency

• • To detect low battery voltage and trigger a shutdown

• • To synchronize multiple devices in low-power mode

• • To periodically wake up the microcontroller to check for system health

Answer explanation

Explanation: In battery-powered devices, the watchdog timer can be used to monitor the battery voltage. If the voltage drops below a certain threshold, the watchdog timer can trigger a shutdown to prevent damage to the device

In a PWM-based LED brightness control system, what parameter affects the LED brightness?

• • Duty cycle

• • Frequency

• • Voltage level

• • Current limit

Answer explanation

• Explanation: In PWM-based LED brightness control, the duty cycle determines the proportion of time the LED remains on compared to off. Higher duty cycles result in brighter LED illumination.

How does an analog-to-digital converter (ADC) convert continuous signals into digital data?

• • By sampling the input signal at regular intervals

• By converting the signal into binary code directly

• • By amplifying the signal before conversion

• • By transmitting the signal wirelessly

What is the significance of the ground connection in electronic circuits?

• • It provides a reference point for voltage levels

• • It increases the resistance in the circuit

• • It reduces the current flow in the circuit

• • It is used for wireless communication

Which of the following is NOT a type of GPIO pin on the ESP32?

• • Input

• Output

• • Analog

• Ground

Answer explanation

Explanation: Ground pins are not considered GPIO (General Purpose Input Output) pins. They are used for electrical grounding.

What advantage does the ESP32 offer over most Arduino boards?

• • Higher Processing Power and Memory

• Enhanced compatibility with sensors and modules

• Built-in Wi-Fi and Bluetooth Connectivity

• • Reduced power consumption