from machine import Pin, Timer, SoftI2C
import onewire, ds18x20, time
from ssd1306 import SSD1306_I2C

i2c = SoftI2C (sda = Pin(12), scl = Pin(13))
oled = SSD1306_I2C(128, 64, i2c, addr = 0x3c)
#初始化DS18B20
ow = onewire.OneWire(Pin(15)) #构建单总线，Pin参数根据接线引脚修改
ds = ds18x20.DS18X20(ow)        #传感器是DS18B20

def fun(tim):
    oled.fill(0)
    rom = ds.scan()         #扫描单总线上的传感器地址，支持多个传感器同时连接
    ds.convert_temp()  # 温度转换
    temp = ds.read_temp(rom[0]) #获取温度值,rom[0]为第1个DS18B20
    print('%.2f'%(temp))

    oled.text(str('%.2f'%(temp)) + 'C', 40,30)
    oled.show()

tim = Timer(1)
tim.init(period = 1000, mode = Timer.PERIODIC, callback = fun)