MicroPython ESP32 读取DS18B20温度数据

Posted 2022-08-16 perseverance52

MicroPython ESP32 读取DS18B20温度数据

---

• DS18B20
  

• 接线图
  

• 本示例基于Thonny平台开发

引入的模块

from ds18x20 import DS18X20
import time, onewire 
from machine import Pin

示例代码

DS18B20接在ESP32 的22号引脚上

from ds18x20 import DS18X20
import time, onewire 
from machine import Pin
OneWirePin = 22
def readDS18x20(): 
    # the device is on GPIO22
    dat = Pin(OneWirePin)
    # create the onewire object
    ds = DS18X20(onewire.OneWire(dat))
    # scan for devices on the bus
    roms = ds.scan()
    ds.convert_temp() # 数据转换
    time.sleep_ms(750)
    values = []   

    for rom in roms:
        values.append(ds.read_temp(rom))
        
    # values.append(u"℃")
    print(values,r"℃")
    return values
while True:
    readDS18x20()
    time.sleep(5)

示例二

from ds18x20 import DS18X20
import machine,onewire,time

def read_temp():
    # the device is on GPIO22
    dat = machine.Pin(22)
    # create the onewire object
    ds = DS18X20(onewire.OneWire(dat))
    # scan for devices on the bus
    roms = ds.scan()
    # print('found devices:', roms)
    print('temperature:', end=' ')
    ds.convert_temp()
    time.sleep_ms(750)
    temp = ds.read_temp(roms[0])
    print(temp,end='℃\\n ')
    return temp
while True:
    read_temp()
    time.sleep(3)

• Shell调试窗口输出
  

示例三

读取10次温度数据，去平均值

from ds18x20 import DS18X20
from onewire import OneWire
from machine import Pin
import time

def status():
        dat = OneWire(Pin(22))
        ds = DS18X20(dat)
        roms = ds.scan()

        if not len(roms):
            print("Nao encontrei um dispositivo onewire.")
            return None

        ds.convert_temp()
        time.sleep_ms(750)

        temp = 0
        for i in range(10):
            for rom in roms:
                temp += ds.read_temp(rom)       
        return temp / 10
    
while True:
    print(status(),end='℃\\n ')
    time.sleep(3)

• Shell调试窗口输出