Blinking an LED

What will we do

Lets start by making our LED blink on and off. The way to make an LED blink is to follow this sequence of code instructions over and over again:
  • Turn the LED on
  • Delay for a period of time
  • Turn the LED off
  • Delay for a period of time
Please ensure that you have mBlock setup on you computer. Click here to setup mBlock

Parts List

You will need the following parts:
  • 1x arduino uno
  • 1x arduino USB Cable
  • 1x Breadboard
  • 2x Jumper Wire
  • 1x LED
  • 1x Resistor
You can purchased an Arduino kit from here​
Arduino UNO R3 Basic Starter Kit

Wiring it up

This example we use a red LED but you can use any colour LED you prefer.
Ensure that the LED are the right way around, with the longer positive leads (anodes) to the left.

mBlock IDE

Launch the mBlock IDE ( and select the Arduino Uno Device.

Install the KidsCode Extension

Click on the Extensions button
Search for Kids Code on the extension popup and Add the Kids Code extension
You will see the Kids Code blocks at the bottom.

Block Coding

mBlock Block-Based IDE- Coding for Beginners
Last modified 10mo ago