from machine import Pin, PWM
import utime, math
import time

servo= PWM(Pin(21), freq=50)

def set_angle(angle):
    duty = int(((angle)/180 * 2 +0.5) / 20 * 1023)
    servo.duty(duty)

butt0= Pin(18, Pin.IN, Pin.PULL_UP) # naming unintentional
butt90= Pin(19, Pin.IN, Pin.PULL_UP)
butt180= Pin(5, Pin.IN, Pin.PULL_UP)

while True:
    if butt0.value() == 0:
        set_angle(0)
        print("↑")
        time.sleep(0.3)

    elif butt90.value() == 0:
        set_angle(90)
        print("→")
        time.sleep(0.3)

    elif butt180.value() == 0:
        set_angle(180)
        print("↓")
        time.sleep(0.3)