Railway crossing - Brio, Ikea

This is a railway crossing for BRIO, IKEA, and other compatible sets, controlled by an Arduino UNO. (https://www.aliexpress.com/item/1005007066680464.html?spm=a2g0o.order_list.order_list_main.218.4ca91802J6c8om)

One button starts a full cycle: the red flashing lights turn on, the barrier lowers and raises again, and the white lights start blinking once more.

I used 5 mm LEDs with a 1 kOhm series resistor to lower the brightness, along with a buzzer from my drawer. The barriers are driven by 2pcs MG90S servos.(https://www.aliexpress.com/item/1005008626768357.html?spm=a2g0o.order_list.order_list_main.238.4ca91802J6c8om)

The electronics were temporarily hidden in a box and powered for almost a year by three AA 1.5 V lithium batteries. Unfortunately, they are now discharged, but the system can also run from a power bank.

It was printed on an MK4S(without MMU) using leftover PLA and PETG, as I wanted the colors to look as realistic as possible. The STEP file can easily be split into separate, easy-to-print parts in PrusaSlicer.

Arduino UNO pinout:

const int led1 = 8; // RedLED 1

const int led2 = 9; // Red LED 2

const int buzzer = 7; // Buzzer

const int whiteLed = 6; // WhiteLED

const int buttonPin = 10; // Button

const int servoPin1 = 11; // Servo 1 signal

const int servoPin2 = 12; // Servo 2 signal