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Coding

Creating the while True loop​

Type the following line of code under from microbit import *

while True:

Once you press enter your cursor will automatically indent. Start typing the rest of your code from here.

Turning the Red LED On​

Type the following code to turn the red led on for 1 second.

pin0.write_digital(1)
sleep(1000)

Turning the Yellow LED on​

Type the following code to turn the yellow LED on for 1 second. The red LED will also stay on.

pin1.write_digital(1)
sleep(1000)

Turning the Red and Yellow LEDs Off​

The following code will turn the yellow and red LEDs off ready for the green LED to turn on.

pin0.write_digital(0)
pin1.write_digital(0)

Turning the Green LED On​

The following code will turn the green LED on for 1 second.

pin2.write_digital(1)
sleep(1000)

Turning the Green LED off & Yellow LED On​

The following code will turn the green LED off and the yellow LED on for 1 second.

pin2.write_digital(0)
pin1.write_digital(1)
sleep(1000)

Turning the Yellow LED Off​

The following code will turn the yellow LED off.

pin1.write_digital(0)

Here is our completed code:

from microbit import *

while True:
  pin0.write_digital(1)
  sleep(1000)
  pin1.write_digital(1)
  sleep(1000)
  pin0.write_digital(0)
  pin1.write_digital(0)
  pin2.write_digital(1)
  sleep(1000)
  pin2.write_digital(0)
  pin1.write_digital(1)
  sleep(1000)
  pin1.write_digital(0)

Well done you have now completed the code for the Traffic Lights. Let's move on to learn how to download it to the micro:bit.