移动平均温度值（Python）

Question

我正在测量Raspberry Pi 3中的CPU温度并获得非常嘈杂的值。 每秒测量一次温度，应通过移动平均值（又称滑动窗口）。每5秒钟应将一个新的Temp.value放入SQLite数据库。 到目前为止，我已经找到了仅适用于静态数据阵列的解决方案。有人可以帮忙解决这个问题吗？我需要一个每秒获取一个值并每5秒返回一次平均值的函数。 然后可以将算法应用于诸如湿度，电压等的值。 Raspberry Pi 3中的温度传感器的精度为0.538°C。

这就是我现在所拥有的：

 #!/usr/bin/python
# -*- coding: utf-8 -*-

# Das Programm speist Temperaturen von CPU ins SQLite Datenbank für spätere
# Darstellung auf einer Webseite

from subprocess import check_output
import sqlite3
import time
import numpy

# Pfad zur Datenbank
dbname = "/var/www/cpuTemp_Database.db"
temp_array = []

def log_temperature(currentTemp):
    """ Speichern in die Datenbank"""
    myConnection = sqlite3.connect(dbname)
    myCursor = myConnection.cursor()
    myCursor.execute("INSERT INTO temps VALUES (datetime('now', 'localtime'), (?))", (currentTemp,))
    myConnection.commit()
    myConnection.close()


def abfrage():
    """ Macht CPU-Temperaturabfrage und gibt das Wert zurück wie 53.692 """
    output = check_output(['cat', '/sys/class/thermal/thermal_zone0/temp'])
    stripedVal = output.strip()
    tempVal = float(stripedVal)/1000
    return tempVal

def main():
    """ Main Function"""
    while True:
        for i in range(5):
            tempValue = abfrage()
            temp_array.append(tempValue)
            time.sleep(1)
        meanTemp = numpy.median(temp_array)
        log_temperature(meanTemp)
        temp_array [:] = []

if __name__ == "__main__":
    main()

Greerings，Alex

Answer 1

我认为你要求的是每5秒获得最后5秒的平均读数，这不是真正的移动平均线。这应该会给你这种行为。

import numpy

# Once you input enough new data points into this function, it will calculate
# and log the average of the last several data points.
def log_periodic_average(new_data_point, window, frequency):
  window.append(new_data_point)
  if (len(window) >= frequency): # Now is the only time we calculate an average
    average = numpy.mean(window)
    log_temperature(average) # Using your function to save the average
    window = [] # Clear window to collect the next 5 seconds of data
  return window

window = []
while True:
  point = abfrage() # using your function to get current temperature 
  window = log_periodic_average(point, window, 5)
  sleep(1000)