Additional sensors and actuators can be add as Jacdac modules. MicroCode automatically detect additional hardware and will show the additional tiles if supported.

The railroad crossing sample shows a program using a servo and a LED ring Jacdac module.

The servo uses a servo motor move to move an physical arm. The servo arm orientation is mapped to the wall clock hours: 0 (or 12) is on rotated 90 degree from the resting position to the left, 6 is rotated 90 degree right from the rest position. There is also a secret animation mode when you press the micro:bit logo button.

• when press button A, do servo set arm to 1 o'clock.

The LED uses a programmable LED ring module to display blue and red colors.

• when press button A, do LED set all color to red, black and repeat.