Arduino sleep modes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using sleep modes in Arduino?

Sleep modes help reduce power consumption by putting the Arduino into a low-power state when it is idle.

beginner

Name the common sleep modes available on Arduino.

The common sleep modes are: Idle, ADC Noise Reduction, Power-down, Power-save, Standby, and Extended Standby.

intermediate

How does the 'Power-down' sleep mode affect the Arduino?

In Power-down mode, almost all of the Arduino's functions are stopped to save maximum power, but it can still wake up from external interrupts.

beginner

Which Arduino library is commonly used to manage sleep modes?

The library is used to control sleep modes on Arduino boards based on AVR microcontrollers.

intermediate

What is the difference between 'Idle' and 'Standby' sleep modes?

Idle mode stops the CPU but keeps peripherals running, allowing quick wake-up. Standby mode stops the CPU and all clocks except the oscillator, saving more power but with a slightly longer wake-up time.

Which Arduino sleep mode saves the most power?

A Power-down

B Idle

C ADC Noise Reduction

D Standby

Power-down mode stops almost all functions, saving the most power.

Which library do you include to use sleep functions on an AVR-based Arduino?

A <LowPower.h>

B <ArduinoSleep.h>

C <avr/sleep.h>

D <SleepMode.h>

The library provides sleep mode functions for AVR Arduinos.

In which sleep mode does the CPU stop but peripherals keep running?

A Idle

B Extended Standby

C Power-down

D Power-save

Idle mode stops the CPU but keeps peripherals active.

What can wake the Arduino from Power-down mode?

A Timer interrupts only

B Both timer and external interrupts

C No interrupts can wake it

D External interrupts only

Only external interrupts can wake the Arduino from Power-down mode.

Why use sleep modes in Arduino projects?

A To increase processing speed

B To reduce power consumption

C To add more memory

D To improve sensor accuracy

Sleep modes reduce power use when the Arduino is idle.

Explain how Arduino sleep modes help save power and name at least three different modes.

Think about what happens to the CPU and peripherals in each mode.

Describe how to put an Arduino into sleep mode using the avr/sleep.h library.

Consider the steps to prepare and enter sleep.