from machine  import Pin,SoftI2C
from time import sleep,sleep_us,ticks_us
i2c = SoftI2C(scl=Pin(32),sda=Pin(33))
# 创建软件i2c对象
from SSD1306 import SSD1306_I2C
#从SSD1306库中导入oled的I2C方法
oled = SSD1306_I2C(128,64,i2c)
# 创建oled对象

trig = Pin(2,Pin.OUT)
echo = Pin(15,Pin.IN)

while 1:
    dis = 0
    trig.vlaue(1)
    sleep_us(10)
    trig.vlaue(0)

    while echo.value() == 0:
        pass
    if echo.value()==1:
        ts = ticks_us()
        while echo.value() == 1:
            pass
        te = ticks_us()
# - 声速：343m/s = 34300cm/s = 0.0343cm/μs → 单程声速=0.01715cm/μs        
        tc=te-ts
        dis = tc * 0.01715
        

'''
for i in range(10):
    oled.text(str(i),5,10)
    # oled显示屏要显示的文本内容，必须是字符串
    oled.show()
    # oled显示
    sleep(1)
    oled.fill(0)
    # 清空oled显示屏
    '''