from machine import Pin, PWM
from time import sleep

#este metodo
def set_vel_motor_M1(vel):
    #configurar pines para motor M1
    ain_1 = PWM(Pin(12))
    ain_2 = PWM(Pin(13))
    #Fijar las frecuencias a 60Hz
    ain_1.freq(50)
    ain_2.freq(50)
    #fijar la velocidad
    if(vel>0):
        ain_1.duty(vel*10)
        ain_2.duty(0)
    elif(vel<0):
        vel = -vel
        ain_1.duty(0)
        ain_2.duty(vel*10)
    else:
        ain_1.duty(0)
        ain_2.duty(0)
        
def main():
    vel = -100
    step = 10
    while(1):
        set_vel_motor_M1(vel)
        vel += step
        sleep(2)
        if(vel>100 or vel<-100):
            step = -step
            vel += step
        print(vel)
        pass

if __name__ == "__main__":
    main()