使用 Python 设置将插入到 MySQL 的温度和湿度的最大值和最小值

Question

我有一些关于如何设置 max/min 温度或湿度值的问题，因为有时在重启期间，湿度值突然飙升至 >5000% 或有时温度 >100C。

所以，我想确保此数据不会插入 SQL 并使用添加到 .py

的 python 脚本进行过滤

我应该更改此行吗？

            if temp is not and hum is not None:

import serial
import time
import pymysql.cursors
#Connect to database
connection = pymysql.connect(host='localhost',
                             user='ubuntu',
                             password='testing',
                             database='Blabla',
                             cursorclass=pymysql.cursors.DictCursor)
arduino = serial.Serial('/dev/ttyACM0', 9600)
print('Established serial connection to Arduino')
with connection:
    while True:
            arduino_data = arduino.readline()
            decoded_values = str(arduino_data[0:len(arduino_data)].decode("utf-8"))
            list_values = decoded_values.split(' ')
            print(f'Collected readings from Arduino: {list_values}')
            arduino_data = 0
            temp = list_values[0]
            hum = list_values[1]
            #Here we are going to insert the data into the Database
            if temp is not and hum is not None:
                with connection.cursor() as cursor:
                    cursor.execute("INSERT INTO `SensorTest` (`Temperature`, `Humidity`) VALUES (%s,%s)", (temp,hum))
                    connection.commit()
                    cursor.close()
            else:
                print('Failed to read the sensor')
            time.sleep(60)

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Answer 1

您当然可以在此行中添加更多过滤器以确保值没有错误。

我建议在脚本开始时（导入之后）为温度和嗡嗡声设置常量有效最小值和最大值，例如：

MIN_VALID_TEMP = -20
MAX_VALID_TEMP = 90
MIN_VALID_HUM = 10
MAX_VALID_HUM = 1000

接下来我建议将温度和嗡嗡声验证拆分为辅助函数，例如：

def validate_reading(temp, hum):
    if not temp or not hum:
        return false
    if (temp > MIN_VALID_TEMP  and temp < MAX_VALID_TEMP and
    hum > MIN_VALID_HUM and hum < MAX_VALID_HUM):
        return true
    return false

如果满足以下条件，请切换您的原始版本：

if temp and hum is not None:

至：

if validate_reading(temp, hum):

此外，您接下来可以做的是在读数无效时添加不同的印刷品！

最终文件将如下所示：

import serial
import time
import pymysql.cursors

# define valid temp and hum
MIN_VALID_TEMP = -20
MAX_VALID_TEMP = 90
MIN_VALID_HUM = 10
MAX_VALID_HUM = 1000


def validate_reading(temp, hum):
    if not temp or not hum:
        return False
    if temp > MIN_VALID_TEMP and temp < MAX_VALID_TEMP and hum > MIN_VALID_HUM and hum < MAX_VALID_HUM:
        return True
    return False


# Connect to database
connection = pymysql.connect(
    host="localhost", user="ubuntu", password="testing", database="Blabla", cursorclass=pymysql.cursors.DictCursor
)
arduino = serial.Serial("/dev/ttyACM0", 9600)
print("Established serial connection to Arduino")
with connection:
    while True:
        arduino_data = arduino.readline()
        decoded_values = str(arduino_data[0 : len(arduino_data)].decode("utf-8"))
        list_values = decoded_values.split(" ")
        print(f"Collected readings from Arduino: {list_values}")
        arduino_data = 0
        temp = list_values[0]
        hum = list_values[1]
        # Here we are going to insert the data into the Database
        if validate_reading(temp, hum):
            with connection.cursor() as cursor:
                cursor.execute("INSERT INTO `SensorTest` (`Temperature`, `Humidity`) VALUES (%s,%s)", (temp, hum))
                connection.commit()
                cursor.close()
        else:
            print("Failed to read the sensor")
        time.sleep(60)

使用 Python 设置将插入到 MySQL 的温度和湿度的最大值和最小值

Set maximum and minimum value of temperature and humidity that will be inserted to MySQL using Python

mysql

arduino

python-3.x

sensors