温度传感器(DS18B20)

概述

基于DS18B20数字温度传感器,用于检测环境温度。

技术参数

工作电压： VCC 3.3V -5V

模块尺寸：24*48mm

固定安装：2个兼容塑料积木通孔

温度：-55--125℃

引脚定义

引脚	定义
GND	地
VCC	电源
DI	数字输出
NC	空

示例程序

间隔一秒打印温度信息

from mpython import *

from machine import Timer

import onewire

import ds18x20

_ds18x20_list = []

tim13 = Timer(13)

def timer13_tick(_):
    for p in _ds18x20_list:
        try:
            eval("ds_" + p + ".convert_temp()")
            for rom in eval("roms_" + p):
                t = eval("ds_" + p).read_temp(rom)
                eval("set_ds_value_" + p + "(" + str(t) + ")")
                break
        except: pass

tim13.init(period=1000, mode=Timer.PERIODIC, callback=timer13_tick)

import time

def set_ds_value_0(_t):
    global _ds18x20_value_0
    _ds18x20_value_0 = _t

ow_0 = onewire.OneWire(Pin(Pin.P0))
ds_0 = ds18x20.DS18X20(ow_0)
roms_0 = ds_0.scan()
_ds18x20_value_0 = 0
_ds18x20_list.append(str(0))
while True:
    print(_ds18x20_value_0)
    time.sleep(1)