Lesson 195: MicroPython vs. C++ (The Great Debate)

You’ve got a shiny new Raspberry Pi Pico or ESP32 on your desk. You plug it in, stare at your IDE, and then the existential dread sets in. Do you write in C++ and deal with pointers, memory leaks, and compiling errors that sound like ancient curses? Or do you take the easy road with MicroPython, only to wonder if your code is going to run slower than dial-up internet?

I’ve fried enough microcontrollers and lost enough hours to compiling errors to know that this isn’t just a matter of preference. It’s a matter of picking the right tool for the job before you tear your hair out.

Let’s settle the great MicroPython vs. C++ debate once and for all.

The Case for C++ (Arduino Core)

C++ is the old reliable workhorse. If you’ve used the Arduino IDE, you’ve been writing a simplified version of C++.

Pros:

• Blistering Speed: C++ is compiled directly into machine code. It runs exactly as fast as the silicon allows.
• Hardware Control: Need to toggle a pin in a single clock cycle? C++ lets you get right down to the bare metal.
• The Library Ecosystem: There is an Arduino C++ library for literally every sensor ever manufactured.

Cons:

• The Learning Curve: Pointers, memory management, and strict typing can be a nightmare for beginners.
• Compile Times: Make a typo? Wait 30 seconds for it to compile, upload, and crash.

The Case for MicroPython

MicroPython is a lean, mean version of Python 3 optimized to run on microcontrollers.

Pros:

• Instant Gratification: No compiling! You write code, hit save, and it runs immediately on the board via the REPL (Read-Evaluate-Print Loop).
• Readability: It looks like English. You don’t need semicolons or curly braces to define a loop.
• String Manipulation: Handling JSON data from a web API is a breeze in MicroPython compared to the misery of character arrays in C++.

Cons:

• Speed: It’s an interpreted language, which means it’s inherently slower. (Though the Pi Pico’s PIO state machines can solve some of this).
• Memory Overhead: The interpreter itself takes up a chunk of your board’s RAM before you even write a line of code.

The Verdict: Which should you use?

• Use C++ if: You are building a real-time system (like a drone flight controller), need precise microsecond timing, or are running on a tiny chip like an Arduino Uno with very limited RAM.
• Use MicroPython if: You are prototyping, building an IoT dashboard, dealing with lots of web data, or just want to get a project working without pulling your hair out.

Personally, I prototype in MicroPython to prove the hardware works, and if it needs to be bulletproof, I rewrite the final version in C++.