Microbit Controlled Rollercoaster

Always keen to see what else I can motorise with Lego I bought the necessary bits to motorise a Lego roller coaster. I bought only the carts, track and chain links from brick link. link

I borrowed the Ferris Wheel car parts from my daughters Ferris wheel that I had previously "borrowed" to motorise. (See below)

I used some basic cogs and Lego Technic bits to drive the cars up the main ramp(see below). 

I reused the Micro:bit motor controller and Micro:bit I had used previously on the Micro:bit Express and Ferris Wheel blogs(See below).

I used the following code:

from microbit import *

def stop():

    pin8.write_analog(1023)

    pin12.write_analog(1023)

def forward(speed):

    pin8.write_analog(speed)

    pin12.write_digital(0)

    display.scroll(speed)

    

speed = 400 

while True:

    

    if button_a.was_pressed():

        display.scroll('F')

        forward(speed)

    

    if button_b.was_pressed():

        display.scroll('S')

        stop()

Updated code for incremental speed control:

from microbit import *

def stop():

    pin8.write_analog(1023)

    pin12.write_analog(1023)

def forward(speed):

    pin8.write_analog(speed)

    pin12.write_digital(0)

    display.scroll(speed)

    

speed = 400 

while True:

    

    if button_a.was_pressed():

        

        

        speed = speed + 50

        msg = "F" + str(speed)

        display.scroll(msg)

        if speed > 1000:

            speed = 400

        forward(speed)

    

    if button_b.was_pressed():

        display.scroll('S')

        stop()

Over :)