3.4.12 — Mblock

Arduino Uno + LED + 220 Ohm resistor.

In the fast-paced world of educational technology, software versions come and go. However, some versions become legendary — not because they are the newest, but because they hit a perfect balance of features, stability, and accessibility. One such release is mBlock 3.4.12 . mblock 3.4.12

Open mBlock 3.4.12. Switch to Arduino Mode (bottom right). Arduino Uno + LED + 220 Ohm resistor

For the tinkerer with an old Arduino, the teacher with a budget-conscious IT department, or the parent wanting to introduce their child to actual engineering (not just screen-based games), finding a copy of mBlock 3.4.12 is like finding a classic tool in a shed—it doesn’t need an update; it just needs to work. One such release is mBlock 3

Connect the LED (long leg to Pin 13, short leg to GND via the resistor).