Using whatever programming language for the micro:bit that you like best, try modifying the blink or traffic signal code to change the timing of the LEDs. 

For the traffic signal project, you could also try changing the code so that it behaves like a pedestrian crossing and the lights change in response to you pressing button A.

About the Author

If you have found this lesson useful, and want to learn Python, then you might like my book Programming the BBC micro:bit: Getting Started with MicroPython.