STOP:bit - Traffic Light for BBC micro:bit

KitronikSKU: KIT5642K
Option:Solder Yourself Kit
Sale price £2.71
incl. VAT
excl. VAT
Only 3 units left

Compatible with:

Awesome Extras

KitronikACCESS:bit for BBC micro:bit
Sale price £10.42 incl. VAT excl. VAT
KitronikLAMP:bit - Street Light for BBC micro:bit
Sale price £4.58 incl. VAT excl. VAT

Now available in a kit version (self-solder) or assembled version (pre-soldered)! (select above)

The STOP:bit for the BBC micro:bit is the ultimate upgrade for traffic light/pedestrian crossing projects. Love it or hate it, variations of the pedestrian crossing project have been around for decades. The Kitronik STOP:bit is a purpose-built accessory that can only lead to a more enjoyable project with a nicer looking end result.

The STOP:bit is a bolt-on/clip-on board for the BBC micro:bit replicating a traffic light. The PCB has been designed to have the same physical features of a traffic light, with the addition of a BBC micro:bit as the pedestrian crossing control box.

The STOP:bit has 3 10mm diameter LEDs. Each of these LEDs is driven from one of the BBC micro:bit IO pins. Power to the LEDs is supplied from the BBC micro:bit connections. STOP:bit is supplied with 4 countersunk screws which gives you the option of bolting the microbit directly onto the STOP:bit. Alternatively, crocodile clips can be used between the pads on the STOP:bit and the corresponding pads on the microbit.

If your scope is larger than a single traffic light, you can use the microbits radio module to communicate with other lights if they also have a microbit attached. This is great for exploring traffic management in a town or city.

We have also had some custom blocks added to the MakeCode Editor to make the job of coding this project much more simple. This will allow you to do this project in class with younger students. This is further reinforced by STOP:bit being pre-assembled, so there is no soldering or fiddly mechanical fixings, other than those used to secure the microbit, to worry about. However, you are not confined to using our custom blocks, you can also use the 'digital write pin' block.

To add our custom blocks to the editor; Click on the cog in the top right of the editor and select 'Add Package' from the menu. This will open a dialog window with a search box. Type Kitronik into the search box and all of our custom blocks will appear as tiles. Scroll down and select the tile tittled 'kitronik-stopbit' and it will be added to the blocks menu.


  • The kit version requires some soldering.


  • Upgrade your microbit traffic light/pedestrian crossing projects
  • Code it with the Microsoft MakeCode Editor
  • We have added some custom blocks to the MakeCode Editor to make the job of coding more straightforwards, which opens up the project to younger children
  • Attach the BBC micro:bit directly to STOP:bit for a tidy wireless project
  • If using multiple STOP:bits you can use radio to coordinate traffic management
  • Kit version: An easy build kit that requires some simple soldering


Kit Version

  • 1 x STOP:bit PCB
  • 5 x M3 8mm Countersunk Screws
  • 5 x M3 Hex Full Nut
  • 3 x 220 Ohm Resistors
  • 1 x Red 10mm Diffused LED
  • 1 x Green 10mm Diffused LED
  • 1 x Yellow 10mm Diffused LED

Assembled Version

  • 1 x STOP:bit for the BBC micro:bit
  • 5 x M3 8mm Countersunk Screws.
  • 5 x M3 Hex Full Nut.


  • Length: 120mm
  • Base Width: 38mm
  • Height: 15.6mm
  • PCB Thickness: 1.6mm



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