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Learn Mbed-cpp - 10 Code Examples & CST Typing Practice Test

Mbed OS (mbed-cpp) is an open-source embedded operating system and C++ framework designed for ARM Cortex-M microcontrollers. It provides a full-featured platform for building IoT devices, supporting real-time operating system capabilities, peripheral access, and connectivity.

View all 10 Mbed-cpp code examples →
Mbed C++ Button Press CounterMbed C++ LED BlinkMbed C++ Temperature MonitorMbed C++ PWM LED BrightnessMbed C++ Relay ToggleMbed C++ Buzzer ToggleMbed C++ Fan Speed ControlMbed C++ Dual LED ToggleMbed C++ Humidity AlertMbed C++ LED Blink Pattern

Learn MBED-CPP with Real Code Examples

Updated Nov 21, 2025

Explain

Mbed OS enables developers to write C++ code for microcontrollers with access to RTOS features, drivers, and middleware.

It provides abstractions for hardware peripherals, sensors, communication protocols, and networking stacks.

Ideal for professional embedded development, IoT devices, and performance-critical applications.

Core Features

Runs on ARM Cortex-M microcontrollers

Preemptive RTOS with threads and mutexes

Filesystem support for onboard storage

Peripheral drivers for GPIO, ADC, PWM, UART, I2C, SPI

Networking and IoT protocols integrated

Basic Concepts Overview

Thread and RTOS task management

Digital and analog I/O

Timers, interrupts, and event queues

Peripheral drivers and abstraction layers

Networking protocols (MQTT, HTTP, BLE, LoRa, Ethernet)

Project Structure

main.cpp - entry point of application

mbed_app.json - configuration file

drivers/ - peripheral drivers

rtos/ - threads and event handling

lib/ - additional libraries and modules

Building Workflow

Setup Mbed OS project

Write application logic in C++

Include drivers for sensors, actuators, and connectivity

Compile and flash firmware

Debug using serial, SWD, or IDE debugging tools

Difficulty Use Cases

Beginner: blink LED using GPIO

Intermediate: sensor reading with interrupts

Advanced: multi-threaded IoT device

Expert: industrial IoT gateway with connectivity

Enterprise: scalable embedded system with low-power optimization

Comparisons

Mbed C++ is lower-level than MicroPython/CircuitPython

Better suited for professional-grade embedded applications

RTOS support and multi-threading not available in Python-based variants

Higher memory footprint but more performance

Production-ready with advanced connectivity and security

Versioning Timeline

2009 - Mbed platform initiated by ARM

2012 - Mbed OS 2 released with peripheral drivers

2015 - Mbed OS 5 released with RTOS and networking

2018-2022 - Expansion of connectivity modules and IoT support

2025 - Mature ecosystem with multi-threading, RTOS, and production-ready features

Glossary

main.cpp - application entry point

mbed_app.json - configuration file

Thread - RTOS thread object

EventQueue - RTOS event scheduling

NetworkInterface - networking abstraction API

Installation Setup

Install Mbed CLI or Mbed Studio IDE

Select target microcontroller board

Import or create a new Mbed OS project

Compile project using ARM GCC or supported toolchain

Flash compiled binary to the target board

Environment Setup

Install Mbed Studio or Mbed CLI

Select target board

Create or import Mbed OS project

Add required drivers and libraries

Compile and flash firmware to board

Config Files

main.cpp - primary application logic

mbed_app.json - board and application configuration

drivers/ - peripheral drivers

lib/ - additional libraries

assets/ - optional resources

Cli Commands

mbed compile -m <BOARD> -t GCC_ARM

mbed deploy - install project dependencies

mbed export - generate IDE project files

flash binary to microcontroller using IDE or CLI

Monitor serial output via terminal for debugging

Internationalization

Code and APIs support UTF-8 strings

Documentation primarily in English

Board-independent code supports global deployment

Community may provide translations

Works across supported ARM Cortex-M boards

Accessibility

Requires C++ and embedded programming knowledge

IDE and CLI tools provide cross-platform development

Libraries simplify peripheral and network integration

Extensive documentation available online

Active community support for troubleshooting

Ui Styling

LEDs and displays for primary feedback

No native GUI; external dashboards possible

Visual indicators via display or LEDs

Buttons and sensors as input

Focus on functional embedded interfaces

State Management

Variables and objects maintain application state

Threads and events manage task scheduling

Peripherals updated according to application logic

Persistent storage via filesystem if required

Network state managed by connectivity APIs

Data Management

Read sensor values via HAL APIs

Process and store data locally or remotely

Transmit data over networking protocols

Optimize memory and storage usage

Log critical events for debugging and analytics

Architecture

C++ application runs on top of Mbed OS kernel (RTOS)

HAL abstracts microcontroller hardware

Peripheral drivers manage sensors and actuators

Networking stacks handle connectivity

Event-driven and thread-based programming model

Rendering Model

Board runs Mbed OS kernel

Application threads and event queues handle tasks

Drivers control peripherals and sensors

Network stacks handle connectivity

main.cpp controls application flow

Architectural Patterns

Thread-based execution with event queues

RTOS for deterministic timing

HAL for peripheral abstraction

Modular libraries for IoT and connectivity

Configurable via mbed_app.json

Real World Architectures

Industrial IoT gateways

Connected environmental sensors

Wearable embedded devices

Robotics with multiple actuators and sensors

Low-power connected sensor nodes

Design Principles

High performance and low-level control

RTOS-based multi-threading and events

Hardware abstraction for portability

Scalable for IoT and embedded applications

Security and production-ready development

Scalability Guide

Use threads and event queues for modular design

Abstract repetitive hardware operations in drivers

Optimize RTOS scheduling and memory

Distribute tasks across threads efficiently

Split functionality across multiple boards if necessary

Migration Guide

Port C/C++ microcontroller projects to Mbed OS

Update peripheral calls to HAL APIs

Adapt multi-threading and RTOS usage

Verify network and event queue functionality

Test hardware abstraction layer for board compatibility

Performance Notes

High performance suitable for real-time control

RTOS supports deterministic timing

Efficient memory usage with static allocation

Suitable for battery-powered and connected devices

Optimizable for production-grade embedded systems

Security Notes

Supports secure networking with TLS/SSL

Proper memory and resource management required

Device authentication for IoT networks

Firmware updates should be signed and verified

Physical security critical for embedded devices

Monitoring Analytics

Serial debugging for real-time monitoring

Logging system events and sensor outputs

Thread and RTOS monitoring

Network activity logging

Analyze performance and optimize resource usage

Code Quality

Comment and document code clearly

Use modular classes for drivers and logic

Validate multi-threaded execution

Test peripherals under all scenarios

Maintain memory-efficient and secure code

Practical Examples

Blinking LEDs with threads

Reading sensors via I2C/SPI

Controlling motors with PWM

Wi-Fi/BLE communication for IoT

Low-power sleep and wake-up routines

Troubleshooting

Check toolchain compatibility

Verify pin mappings and board configuration

Use debug messages via serial port

Ensure correct Mbed OS version for project

Check network and driver initialization

Testing Guide

Unit test with Mbed OS testing framework

Verify peripheral functionality

Check thread execution and synchronization

Simulate network connections

Validate low-power modes and wake-up events

Deployment Options

Standalone embedded devices

Battery-powered IoT nodes

Networked industrial devices

Connected wearables

Production-ready commercial embedded systems

Tools Ecosystem

Mbed Studio IDE

Mbed CLI command-line tools

ARM GCC, Keil, IAR toolchains

Online compiler and cloud build system

Debugger tools: SWD, JTAG, serial monitors

Integrations

Sensors (temperature, motion, environmental)

Displays (OLED, TFT, e-ink)

Actuators: motors, servos, relays

Networking modules: Wi-Fi, BLE, LoRa, Ethernet

Cloud integration: MQTT, HTTP, Azure, AWS IoT

Productivity Tips

Use RTOS and event queues to organize code

Keep code modular and maintainable

Test each peripheral before combining tasks

Use IDE and CLI tools effectively

Regularly update Mbed OS and libraries

Challenges

Steep learning curve for beginners

Debugging complex multi-threaded applications

Hardware abstraction differences across boards

Power management optimization

Ensuring deterministic behavior in real-time tasks

Learning Path

Learn C++ basics

Understand microcontroller architecture and GPIO

Learn RTOS concepts: threads, events, timers

Install Mbed Studio or CLI

Build simple embedded and IoT applications

Skill Improvement Plan

Week 1: C++ syntax and microcontroller basics

Week 2: GPIO, PWM, ADC, I2C, SPI practice

Week 3: Threading and RTOS event handling

Week 4: Networking (Wi-Fi/BLE) integration

Week 5: Complete IoT or automation projects

Interview Questions

What is Mbed OS and its purpose?

How do threads and event queues work in Mbed?

Explain the main.cpp and mbed_app.json usage

How do you access peripherals in mbed-cpp?

What are best practices for RTOS-based debugging?

Cheat Sheet

#include 'mbed.h'

DigitalOut led(LED1); led = 1;

AnalogIn sensor(A0); float value = sensor.read();

Thread thread(osPriorityNormal, 1024); thread.start(callback(fn));

NetworkInterface *net = NetworkInterface::get_default_instance(); net->connect();

Books

Mastering Mbed OS

C++ for Embedded Systems with Mbed OS

IoT Development with Mbed

Hands-On Embedded Programming with Mbed

Real-Time Embedded Systems using Mbed OS

Tutorials

Getting Started with Mbed OS

GPIO, PWM, ADC Basics in C++

Multi-threading and RTOS event queues

Networking with Mbed OS (Wi-Fi, BLE, LoRa)

Building complete embedded IoT projects

Official Docs

Mbed OS Documentation

Mbed OS API Reference

Mbed CLI and Studio Guides

ARM Developer Community for Mbed

Mbed OS GitHub repositories

Community Links

Mbed OS Forum

GitHub Mbed repositories

ARM Developer Community

Reddit embedded systems and IoT communities

Maker and professional embedded electronics communities

Community Support

Mbed OS community forum

ARM developer community

GitHub Mbed repositories

Reddit and maker community for ARM boards

Professional embedded systems forums

Monetization

Commercial embedded systems

IoT devices and solutions

Professional robotics and automation products

Industrial sensor networks

Prototyping and production-ready electronics

Future Roadmap

Expanded connectivity stacks

Improved low-power optimization

Enhanced security features

Extended board support and drivers

Stronger ecosystem for IoT and production devices

When Not To Use

Simple hobby projects with minimal code

Rapid prototyping for beginners without C++ experience

Memory-constrained microcontrollers without RTOS support

Projects needing interactive scripting

Quick educational projects requiring Python simplicity

Final Summary

Mbed OS is a professional C++ platform for ARM Cortex-M microcontrollers.

Supports RTOS, networking, peripherals, and IoT protocols.

Suitable for performance-critical and production-grade embedded devices.

Offers rich ecosystem, tools, and libraries for professional development.

Focuses on high performance, scalability, and security in embedded applications.

Faq

Is Mbed OS beginner-friendly?

Moderate learning curve; some C++ and embedded knowledge required.

Which boards support Mbed OS?

ARM Cortex-M based boards (STM32, NXP, Nordic, etc.)

Does it support Python scripting?

No, C++ is primary language for Mbed OS.

Can it be used for IoT devices?

Yes, it includes Wi-Fi, BLE, LoRa, and Ethernet stacks.

Is Mbed OS suitable for commercial embedded products?

Yes, it is production-ready and widely used in industry.

Code Sample Descriptions

1

Mbed C++ Button Press Counter

#include "mbed.h"

DigitalOut led(LED1);
InterruptIn button(USER_BUTTON);
int buttonCount = 0;

void updateUI() {
    printf("Button Count: %d\n", buttonCount);
    led = buttonCount % 2;
}

void buttonPressed() {
    buttonCount++;
    updateUI();
}

int main() {
    button.rise(&buttonPressed);
    updateUI();
    while(1) {}
}

Counts button presses and toggles an LED on each press.

Let’s Try →
2

Mbed C++ LED Blink

#include "mbed.h"

DigitalOut led(LED1);

int main() {
    while(1) {
        led = !led;
        printf("LED is %s\n", led ? "ON" : "OFF");
        ThisThread::sleep_for(500ms);
    }
}

Blinks an LED every 500ms using a timer.

Let’s Try →
3

Mbed C++ Temperature Monitor

#include "mbed.h"

int temperature = 25;
bool alert = false;

void updateUI() {
    printf("Temperature: %d\n", temperature);
    if (alert) printf("Alert: High Temperature!\n");
}

void readSensor() {
    temperature += 2;
    alert = temperature > 30;
    updateUI();
}

int main() {
    updateUI();
    readSensor();
    readSensor();
}

Simulates reading temperature and printing alerts when high.

Let’s Try →
4

Mbed C++ PWM LED Brightness

#include "mbed.h"

PwmOut led(LED1);
int brightness = 0;

void updateLED() {
    led.write(brightness / 100.0);
    printf("LED Brightness: %d\n", brightness);
}

void increaseBrightness() {
    brightness += 20;
    if(brightness > 100) brightness = 0;
    updateLED();
}

int main() {
    updateLED();
    increaseBrightness();
    increaseBrightness();
}

Adjusts LED brightness using PWM output.

Let’s Try →
5

Mbed C++ Relay Toggle

#include "mbed.h"

DigitalOut relay(D2);
int state = 0;

void updateUI() {
    printf("Relay is %s\n", state ? "ON" : "OFF");
    relay = state;
}

void toggleRelay() {
    state = !state;
    updateUI();
}

int main() {
    updateUI();
    toggleRelay();
    toggleRelay();
}

Simulates a relay switch toggled by a button press.

Let’s Try →
6

Mbed C++ Buzzer Toggle

#include "mbed.h"

DigitalOut buzzer(D3);
bool isOn = false;

void updateUI() {
    buzzer = isOn;
    printf("Buzzer is %s\n", isOn ? "ON" : "OFF");
}

void toggleBuzzer() {
    isOn = !isOn;
    updateUI();
}

int main() {
    updateUI();
    toggleBuzzer();
    toggleBuzzer();
}

Turns a buzzer on and off using a digital output.

Let’s Try →
7

Mbed C++ Fan Speed Control

#include "mbed.h"

PwmOut fan(D4);
int speed = 0;

void updateUI() {
    fan.write(speed / 5.0);
    printf("Fan Speed: %d\n", speed);
}

void increaseSpeed() {
    speed++;
    if(speed > 5) speed = 0;
    updateUI();
}

int main() {
    updateUI();
    increaseSpeed();
    increaseSpeed();
}

Controls fan speed using PWM steps.

Let’s Try →
8

Mbed C++ Dual LED Toggle

#include "mbed.h"

DigitalOut led1(LED1);
DigitalOut led2(LED2);

void updateLEDs(bool state1, bool state2) {
    led1 = state1;
    led2 = state2;
    printf("LED1: %s, LED2: %s\n", state1 ? "ON" : "OFF", state2 ? "ON" : "OFF");
}

int main() {
    updateLEDs(true, false);
    updateLEDs(false, true);
}

Alternates two LEDs on and off.

Let’s Try →
9

Mbed C++ Humidity Alert

#include "mbed.h"

int humidity = 60;
bool alert = false;

void updateUI() {
    printf("Humidity: %d\n", humidity);
    if(alert) printf("Alert: High Humidity!\n");
}

void readSensor() {
    humidity += 5;
    alert = humidity > 70;
    updateUI();
}

int main() {
    updateUI();
    readSensor();
    readSensor();
}

Simulates a humidity sensor with alert threshold.

Let’s Try →
10

Mbed C++ LED Blink Pattern

#include "mbed.h"

DigitalOut led(LED1);

void blinkPattern() {
    led = !led;
    printf("LED is %s\n", led ? "ON" : "OFF");
}

int main() {
    blinkPattern();
    blinkPattern();
    blinkPattern();
}

Blink an LED in a simple on/off pattern.

Let’s Try →

Frequently Asked Questions about Mbed-cpp

What is Mbed-cpp?

Mbed OS (mbed-cpp) is an open-source embedded operating system and C++ framework designed for ARM Cortex-M microcontrollers. It provides a full-featured platform for building IoT devices, supporting real-time operating system capabilities, peripheral access, and connectivity.

What are the primary use cases for Mbed-cpp?

Professional IoT and embedded device development. Real-time applications with RTOS support. Networking and connected devices (Wi-Fi, BLE, LoRa, Ethernet). Sensor and actuator control for robotics and automation. Prototyping and production-level embedded systems

What are the strengths of Mbed-cpp?

High-performance C++ environment. Robust RTOS and multi-threading support. Wide hardware and connectivity support. Production-grade embedded system features. Strong ecosystem with professional libraries and tools

What are the limitations of Mbed-cpp?

Requires C++ knowledge and embedded experience. Larger memory footprint than lightweight scripting languages. Steeper learning curve for beginners. Complexity increases for small-scale hobby projects. Less interactive than Python-based embedded scripting

How can I practice Mbed-cpp typing speed?

CodeSpeedTest offers 10+ real Mbed-cpp code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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