from machine import Pin,I2C
import time,ssd1306

oled=ssd1306.SSD1306_I2C(128,64,I2C(0,scl=Pin(1),sda=Pin(0)))
r,g=Pin(15,Pin.OUT),Pin(14,Pin.OUT)

def show(msg,t):
    oled.fill(0)
    oled.text(msg,35,20)
    oled.text("Time:{}".format(t),25,40)
    oled.show()

def light(rv,gv,start,end,step,msg):
    r.value(rv);g.value(gv)
    for i in range(start,end,step):
        show(msg,i)
        time.sleep(1)

while True:
    light(1,0,30,0,-1,"STOP")#RED
    light(1,1,5,0,-1,"READY")#YELLOW(5s)
    light(0,1,30,0,-1,"GO")#GREEN
    light(1,1,5,0,-1,"READY")#YELLOW(5s)