Everyone starts somewhere. For a huge number of robot builders, that somewhere is a browser tab full of colourful interlocking blocks — and that’s a brilliant place to begin.
What is Scratch?
Scratch is a free, browser-based visual programming language created by MIT. Instead of typing syntax, you drag and snap together blocks that represent actions, loops, conditions, and events. The blocks are colour-coded by category so it’s immediately obvious what each one does.
It runs entirely in your browser at scratch.mit.edu — nothing to install, no terminal, no error messages about missing semicolons. You build a project, click the green flag, and it runs.
Scratch is aimed at ages 8–16, but plenty of adults use it as a rapid prototyping tool or to teach others. The MIT community hosts millions of shared projects you can remix and learn from.
Blocks snap into a program
You build a program by stacking blocks top to bottom — each one runs in order, and blocks like forever wrap around the ones inside them. Here’s that first control loop drawn as the blocks themselves:
┌────────────────────────────┐
│ when [green flag] clicked │
└────────────────────────────┘
┌────────────────────────────┐
│ forever │
│ ┌───────────────────────┐ │
│ │ move (10) steps │ │
│ └───────────────────────┘ │
│ ┌───────────────────────┐ │
│ │ if on edge, bounce │ │
│ └───────────────────────┘ │
└────────────────────────────┘
That forever loop wrapping a move and an if is exactly the sense-act loop a real robot runs — you’ve written a control loop without typing a single semicolon.
Why robot builders care
Scratch teaches the core ideas of programming — sequences, loops, conditionals, variables, events — in a form where you can’t make a syntax error. That means you spend your mental energy on what you want the robot to do rather than on where you forgot a closing bracket.
Some robot kits connect directly to Scratch. The micro:bit has a Scratch extension that lets you control its LEDs, buttons, and radio from a Scratch project. LEGO SPIKE Prime and LEGO Mindstorms both have Scratch-derived block environments. The HP Robots Otto kit supports a block-based language alongside Python and C++, so you can start with blocks and graduate to text code on the same hardware.
Block coding also makes a great teaching tool if you want to run a robotics club or show a younger family member how robots think.
Get started
The fastest first step is to open Scratch in your browser and build something in ten minutes:
- Go to scratch.mit.edu and click Start Creating — no account needed.
- Build a simple loop: drag a forever block, drop a move 10 steps inside it, add an if on edge, bounce block, and click the green flag.
- You’ve just written your first control loop — the same concept that steers real robots.
Once blocks start to feel limiting, that’s the signal to level up. Python is the natural next step. Kevin’s Python for Beginners course picks up exactly where Scratch leaves off, introducing text-based code with the same beginner-friendly pace. From there, Learn MicroPython — the basics gets you onto real hardware like the Raspberry Pi Pico.
The road from colourful blocks to a physical robot is shorter than you think. Scratch is just the first satisfying snap.
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