Mblock 3.4.12 -

mBlock 3.4.12: The Bridge Between Scratch and Arduino

mBlock 3.4.12 represents a specific, highly stable release of the mBlock 3.x software series. Developed by Makeblock, mBlock is a graphical programming environment based on MIT’s Scratch 2.0. While the software has since evolved into mBlock 4 (Scratch 3.0 based) and mBlock 5 (Python/Scratch 3.0 based), version 3.4.12 remains a significant milestone in the history of STEM education tools.

Live Mode (Stage/Device): Code runs on your computer, sending commands via USB/Bluetooth. Good for instant feedback.
Upload Mode: Code compiles to hex and burns to the Arduino board. The robot runs even when unplugged from the PC.

Typical workflow

Launch mBlock and select Device (e.g., mBot).
Drag blocks into the workspace to build behavior (events → motion → controls → sensors).
Test in “Connect” and use “Run” (live mode) to control robot via USB/Bluetooth, or switch to “Upload” to convert to Arduino code and flash the board.
Use the Serial Monitor to view printed debug messages.
Update device firmware when prompted for compatibility with generated code.

Code export and text view

2. Key Features of the 3.4.12 Release

The 3.4.x branch introduced several refinements over earlier 3.x versions, focusing on hardware compatibility and stability. mblock 3.4.12

Inspect generated code for blocking calls.
Add safeguards (timeouts, input validation).
Link required libraries and test on-device iteratively.