Vincibot Python Lesson 3: LED Matrix Countdown with a While Loop

Build a 10→1 LED-matrix countdown on Vincibot using a while loop, then display “while” to confirm the new code.
What you’ll learn:

While-loop structure: initialize → condition → body → decrement (i -= 1)

Converting a for-based countdown to a while loop and avoiding infinite loops

Outputting numbers vs strings; fixing “time not defined” with import time

Using time.sleep(1) for visible timing and proper indentation

Quick visualization with Python Tutor; multi-line comment/uncomment (Ctrl+/)

Deploying code to main.py and rebooting Vincibot

Designed for upper-elementary to middle-school learners with basic Python or block-coding experience.