from machine import Pin
import time

LED_R = Pin(34, Pin.OUT)
LED_G = Pin(35, Pin.OUT)
LED_B = Pin(32, Pin.OUT)
SW = Pin(18, Pin.IN, Pin.PULL_UP)
i=0
LED_R.value(1)
LED_G.value(0)
LED_B.value(0)
print("running")
def SW_Scan(sw_name):
    if(sw_name.value() == 0):
        time.sleep_ms(20)
        if(sw_name.value()==0):
            while True:
                if(sw_name.value()==1):
                    time.sleep_ms(20)
                    if(sw_name.value()==1):
                        break
        return 1
    return 0

while True:
    if(SW_Scan(SW)==1):
        i+=1
        if(i%3==0):
            LED_R.value(1)
            LED_G.value(0)
            LED_B.value(0)
        elif(i%3==1):
            LED_R.value(0)
            LED_G.value(1)
            LED_B.value(0)
        elif(i%3==2):
            LED_R.value(0)
            LED_G.value(0)
            LED_B.value(1)
    print("now i=",i)
    time.sleep(1)