A switch connected to a microcontroller input pin needs a pull-up or pull-down resistor so that:

The pin reads a definite level when the switch is open

A relay coil cannot be driven directly from a microcontroller pin because:

The pin cannot supply enough current

Absorb the back-EMF when switching off

On-chip analogue-to-digital converter

Repeating a block of instructions in a loop

A reusable named block of code that returns to where it was called

Avoids repeating code and saves program memory

It must keep responding to inputs continuously

Debounce the switch so one press registers once

12questions. Pick an answer and you'll see why right away.

A microcontroller contains a CPU, memory and:
A switch connected to a microcontroller input pin needs a pull-up or pull-down resistor so that:
A relay coil cannot be driven directly from a microcontroller pin because:
When a microcontroller drives a relay through a transistor, a flyback diode is added across the coil to:
An analogue sensor such as a thermistor is read by a microcontroller using its:
The three basic structures of a program are sequence, iteration and:
In a flowchart, a decision (an if) is represented by a:
Iteration in a program means:
A subroutine is best described as:
One advantage of using a subroutine is that it:
A control program usually runs as a forever loop because:
A short time delay after detecting a switch press is often used to: