# Design Your First PCB: 10 Popular Microcontrollers to Get Started Compare 10 popular microcontrollers for a first PCB, including interfaces, power needs, learning curve, and design trade-offs. Written by [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Published Oct 2026 - 5 min read [![Top 10 Popular Microcontrollers for Embedded Systems including STM32F103C8T6, ESP32, ESP8266, ATtiny85, PIC16F877A, ATmega32U4, ATmega328P, and more. Essential MCUs for IoT, DIY projects, and professional PCB designs with key features like Wi-Fi, USB, and Bluetooth support.](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/main.webp)](#) ## At the heart of any embedded system project—whether for a DIY prototype or a professional product—lies a microcontroller (MCU). These MCUs and microprocessors execute firmware to obtain inputs from sensors and connect them to actions through actuators. While many microcontrollers are designed as general-purpose components, they also feature specialized peripherals like ADC, PWM, and serial ports for specific applications. With advancements in technology, embedded systems have become more diversified and powerful, making it harder for designers to choose the right MCU or microprocessor for their project. Before choosing a microcontroller, list the inputs, outputs, communications, memory, power budget, and available board area. A familiar part is useful only if it also fits the electrical and sourcing constraints of your project. For a first custom board, check the reference schematic for decoupling, reset, boot configuration, programming access, and voltage levels. These support circuits often determine whether a promising MCU is practical to integrate. Compare packages as well as specifications. Fine-pitch or leadless parts may require tighter fabrication rules and more careful assembly than a beginner-friendly package, even when their firmware ecosystem is attractive. This article highlights 10 of the most popular microcontrollers, based on their usage in embedded systems, memory architecture, and the community support they enjoy. Let’s dive in! ### 1\. STM32F103C8T6 The [STM32F103C8T6](https://www.flux.ai/vasy_skral/stm32f103c8t6) is a versatile microcontroller with a 32-bit ARM Cortex-M3 core running at 72 MHz. It offers flash memory, non-volatile memory, and multiple peripherals like SPI, I²C, and CAN. Its performance makes it ideal for general-purpose embedded systems. **Key Features:** - **CPU:** ARM Cortex-M3 microprocessor, 72 MHz - **Memory:** 128 KB flash memory, 20 KB SRAM - **Peripherals:** SPI, I²C, CAN, USB, USART, ADC - **Timers:** 7, including PWM support **Development Board:** [ ![3D view of Blue Pill Development Board](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/blue-pill-module.webp) ](https://www.flux.ai/vasyl/stm32-blue-pill-breakout?editor=pcb_3d) [Blue Pill](https://www.flux.ai/vasyl/stm32-blue-pill-breakout?editor=pcb_3d) ### 2\. ATmega328 The [ATmega328P](https://www.flux.ai/vasy_skral/atmega328p-mu), a popular Atmel microcontroller, powers many Arduino boards like the Uno. It offers easy programming through the Arduino IDE and features EEPROM for non-volatile memory storage. This microcontroller is great for beginners and general-purpose applications. **Key Features:** - **Architecture:** 8-bit AVR microprocessor - **Clock Speed:** 20 MHz - **Memory:** 32 KB flash memory, 2 KB SRAM, 1 KB EEPROM - **Peripherals:** UART, SPI, I²C, ADC **Development Boards:** [ ![3d view of Arduino nano microcontroller development board](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/arduino-nano-module.webp) ](https://www.flux.ai/vasyl/arduino-nano?editor=pcb_3d) - [Arduino Uno](https://www.flux.ai/vasy_skral/arduino-uno-r3-shield-template)**,** [Nano](https://www.flux.ai/vasyl/arduino-nano?editor=pcb_3d)**,** [Pro Mini](https://www.flux.ai/adrian95/arduino-pro-mini?editor=pcb_3d) ### 3\. PIC16F877A The [PIC16F877A](https://www.flux.ai/adrian95/pic16f877a-ip) is a Microchip microcontroller widely used for educational purposes. Its support for non-volatile memory and easy-to-use peripherals makes it an excellent choice for beginners. **Key Features:** - **Memory:** 14 KB flash memory, 368 bytes RAM, 256 bytes EEPROM - **Peripherals:** UART, SPI, I²C, ADC - **Timers:** 3, including timer counter - **Oscillator:** External up to 20 MHz **Development Board:** - PIC Development Board ### 4\. ATtiny85 The [ATtiny85](https://www.flux.ai/adrian95/attiny85-20su), another compact Atmel microcontroller, is ideal for small embedded systems. It supports SPI, I²C, and offers EEPROM for non-volatile memory. **Key Features:** - **CPU:** 8-bit AVR, 20 MHz - **Memory:** 8 KB flash memory, 512 bytes SRAM, 512 bytes EEPROM - **Peripherals:** SPI, I²C, ADC **Attiny85 ready-to-use module:** [ ![3d view of an attiny85-powered wrist watch module](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/attiny85-watch.webp) ](https://www.flux.ai/vasy_skral/arduino-watch-module?editor=pcb_3d) [ATtiny85-powered wrist watch](https://www.flux.ai/vasy_skral/arduino-watch-module?editor=pcb_3d) **Development Boards:** - Digispark ATtiny85 ### 5\. MSP430G2452 The [MSP430G2452](https://www.flux.ai/search?q=MSP430&type=components) from Texas Instruments is known for low power operation, making it ideal for battery-powered embedded systems. It features essential peripherals and non-volatile memory. **Key Features:** - **CPU:** 16-bit RISC microprocessor - **Memory:** 8 KB flash memory, 256 bytes SRAM - **Peripherals:** SPI, I²C, ADC **Development Board:** - MSP-EXP430G2 LaunchPad ### 6\. ESP8266 The [ESP8266](https://www.flux.ai/jecstronic/esp8266ex), an Espressif microcontroller, offers Wi-Fi connectivity and supports UART and SPI peripherals. It’s ideal for IoT projects and wireless applications. **Key Features:** - **CPU:** 32-bit RISC microprocessor, 80 MHz - **Memory:** 80 KB RAM, 16 KB instruction RAM - **Peripherals:** Wi-Fi, UART, SPI **Development Boards:** - [NodeMCU](https://www.flux.ai/jharwinbarrozo/nodemcu-12e-esp8266?editor=pcb_3d)**,** [Wemos D1 Mini](https://www.flux.ai/jharwinbarrozo/wemos-d1-mini?editor=pcb_3d) [ ![3d view of NodeMCU 12E microcontroller board](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/nodemcu.webp) ](https://www.flux.ai/jharwinbarrozo/nodemcu-12e-esp8266?editor=pcb_3d) Ready-to-use [NodeMCU 12e Module](https://www.flux.ai/jharwinbarrozo/nodemcu-12e-esp8266?editor=pcb_3d) ### 7\. ESP32 The [ESP32](https://www.flux.ai/sitemap/microcontrollers/esp32) builds on the ESP8266 by adding dual-core processing and Bluetooth support. It is a powerful microcontroller for advanced embedded systems and general-purpose applications. **Key Features:** - **CPU:** Xtensa LX6 dual-core microprocessor, 240 MHz - **Memory:** 520 KB SRAM - **Peripherals:** Wi-Fi, Bluetooth, SPI, I²C, ADC #### Explore ESP32 Featured Projects Curious about what you can build with the powerful ESP32 microcontroller? From smart home devices to IoT-based monitoring systems, the possibilities are endless! Check out some incredible [ESP32 featured projects](https://www.flux.ai/p/projects?categories=esp32) created by the Flux community, and get inspired to build your own. [ ![A screenshot of a page where ESP32 projects are featured](https://www.flux.ai/p/assets/blogs/top-10-popular-mcu/esp32-featured-projects.webp) ](https://www.flux.ai/p/projects?categories=esp32) **Development Boards:** - [ESP32-DevKitC](https://www.flux.ai/vasy_skral/esp32-devkitc)**,** HUZZAH32 ### 8\. ATmega32U4 The [ATmega32U4](https://www.flux.ai/sitemap/microcontrollers/atmega32u4), another Atmel microcontroller, supports USB connectivity. It’s commonly used in custom keyboards and other embedded systems requiring serial communication. **Key Features:** - **CPU:** 8-bit AVR microprocessor, 16 MHz - **Memory:** 32 KB flash memory, 2.5 KB SRAM - **Peripherals:** USB, UART, SPI, ADC **Development Boards:** - Arduino Leonardo, Teensy 2.0 ### 9\. STM8S103F3 The [STM8S103F3](https://www.flux.ai/search?q=STM8S103F3&type=components) is a reliable 8-bit microcontroller for industrial automation. It offers robust peripherals for control systems. **Key Features:** - **Memory:** 8 KB flash memory, 1 KB RAM - **Peripherals:** SPI, I²C, UART, ADC **Development Boards:** - STM8S103F3 P6 Board ### 10\. NXP LPC1768 The [LPC1768](https://www.flux.ai/search?q=LPC1768&type=components) is a high-performance microcontroller with advanced connectivity peripherals like Ethernet and USB. It is suitable for demanding embedded systems. **Key Features:** - **CPU:** ARM Cortex-M3 microprocessor, 100 MHz - **Memory:** 512 KB flash memory, 64 KB SRAM - **Peripherals:** Ethernet, USB, CAN **Development Boards:** - Mbed LPC1768, LPCXpresso Board ### Choose the Right Microcontroller for Your Project Every microcontroller listed here offers unique features for embedded systems. If you need low power operation, like the MSP430, or the wireless capability of the ESP32, there is a suitable MCU for every project. Choose wisely based on your project’s needs. ### FAQs: Frequently Asked Questions **1\. What is the meaning of MCUs?** MCUs (Microcontrollers) are compact integrated circuits that control specific functions in electronic devices. They contain a processor, memory, and input/output peripherals on a single chip, making them ideal for embedded systems, such as IoT devices, robots, and consumer electronics. **2\. Which microcontroller is best for beginners?** The ATmega328 (Arduino Uno) is ideal due to its simplicity and community support. **3\. What’s the difference between ESP8266 and ESP32?** The ESP32 offers dual-core processing, Bluetooth, and more advanced security features. **4\. Which MCU is best for low power?** The MSP430 series is renowned for its ultra-low power consumption. ### Design Smarter, Not Harder – Build Your PCB with Flux Whether you’re experimenting with an ATmega328 for your first Arduino project or building a cutting-edge ESP32-based IoT device, designing a custom PCB will take your project to the next level. Flux makes it easy with an intuitive interface, smart design tools, and access to a huge component library. No matter your experience level, Flux helps you create PCBs quickly and efficiently, without the usual headaches. Get started today—[sign up for Flux](https://www.flux.ai/signup) and bring your ideas to life! ## About the author [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Electronics Engineer at Flux Jharwin is an electronics engineer mainly focused on satellites. He built his own ground station using Flux to monitor RF activities on the International Space Station. Find him on Flux [@jharwinbarrozo](https://flux.ai/jharwinbarrozo) Let’s start building Build your big idea together with Flux. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. ![Close-up photo of a PCB made with Flux, with an ESP32 module, buttons, and a microSD slot.](https://www.flux.ai/p/assets/blogs/miscellaneous/sidebar-cta-pcb.webp) [Try it Free](https://www.flux.ai/signup) ## More in Step-by-Step Projects & Templates [ ![Two custom macro pads designed using Flux and powered by Raspberry Pi Pico. The pads feature 12 mechanical switches with per-key white keycaps, two rotary encoders for additional control, and a slide potentiometer for precise adjustments. Both boards are displayed with a vibrant purple PCB design, showcasing Flux's PCB editor and its newest AI Auto-Layout, and are compatible with popular manufacturer specifications.](https://www.flux.ai/p/assets/blogs/rpi-macro-2/main.webp) ### Design Your Own Macropad With AI Auto-Layout 8 Min Read](https://www.flux.ai/p/blog/how-to-design-a-custom-macro-pad-with-flux)[ ![This image features two main components: On the left is a detailed layout design of an electronic circuit board named "GREEN DOT 2040E5," dated 2023.11.11, and marked as made with Flux.AI. This board includes an RP2040 microcontroller at its heart, surrounded by various electronic components like resistors, capacitors, a switch, and interface connectors for peripherals, labeled with GPIO pins, I2C connections (SDA and SCL), ground (GND), and power supply inputs (3.3V, 5V, 12V). On the right, there's a physical representation of the IoT device, which is an assembled and operational LoRa IoT Sensor Node powered by a battery pack and RP2040 microcontroller. The node is connected to a long, black antenna, indicating its capability to communicate over LoRa (Long Range) wireless networks, commonly used in agriculture for remote monitoring and control. 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[Try it Free](https://www.flux.ai/signup) ![Close-up of a Flux-designed printed circuit board](https://www.flux.ai/p/assets/homepage-v2/mission-visual.webp)