已解决,添加的解决方案进一步下降 我一直试图从热传感器的输出创建一个PyRRD图,我已连接到我的Raspberry Pi,但没有运气得到实际数据显示在图表(但创建了png文件)。我不确定这是否是正确的方法,但是这个代码每秒都会吐出温度,所以while循环至少可以工作。Python(PyRRD)和RRD while循环?
import os
import glob
import time
import subprocess
# RDD-imports
from pyrrd.graph import DEF, CDEF, VDEF
from pyrrd.graph import LINE, AREA, GPRINT
from pyrrd.graph import ColorAttributes, Graph
from pyrrd.rrd import DataSource, RRA, RRD
# Sensor-stuff
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
# RRD-stuff
startTime = int(time.time())
filename = 'temptest.rrd'
dataSources = []
rras = []
dataSource = DataSource(dsName='temp', dsType='DERIVE', heartbeat=5)
dataSources.append(dataSource)
rra1 = RRA(cf='AVERAGE', xff=0.5, steps=1, rows=5)
rra2 = RRA(cf='AVERAGE', xff=0.5, steps=6, rows=10)
rras.extend([rra1, rra2])
myRRD = RRD(filename, ds=dataSources, rra=rras, start=startTime)
myRRD.create()
# Graph-making
graphfile = 'tempgraf.png'
def1 = DEF(rrdfile=myRRD.filename, vname='mytemp', dsName=dataSource.name)
# Data going into green field
cdef1 = CDEF(vname='temp', rpn='%s,3600,*' % def1.vname)
# Line for max value
line1 = LINE(value=30, color='#990000', legend='Max temp allowed')
# Green area
area1 = AREA(defObj=cdef1, color='#006600', legend='Temp')
def read_temp_raw():
catdata = subprocess.Popen(['cat',device_file], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out,err = catdata.communicate()
out_decode = out.decode('utf-8')
lines = out_decode.split('\n')
return lines
def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string)/1000.0
myRRD.bufferValue(int(time.time()), int(temp_c))
myRRD.update()
return temp_c
while True:
print(read_temp())
g = Graph(graphfile, start=startTime, end=int(time.time()), vertical_label='Temp(c)')
g.data.extend([def1, cdef1, line1, area1])
g.write()
time.sleep(1)
我一直在尝试,阅读RRD手册中的ALOT和初学者教程,但我不能得到这个权利。我对#Graph-making部分中的rpn-stuff非常不确定。请帮助我:) 如果还有更好的方法来做到这一点,请告诉我!
解决方案(对我的问题):删除PyRRD并尝试了rrdtools自己的python实现。 http://oss.oetiker.ch/rrdtool/prog/rrdpython.en.html
我所创建的数据库中的程序之外,并且在终端正确设置步骤是这样的(Linux)的:
rrdtool create dailyTemp.rrd --step 5 \
DS:temp:GAUGE:10:-100:200 \
RRA:AVERAGE:0.5:1:2880 RRA:MAX:0.9:1:2880 \
我然后下降连接到PyRRD所有代码和只是增加了一些进口线和一条排为rrdtool更新。干净多了,现在我可以创建图表:d 这里是“最后的”代码:
import os
import glob
import time
import subprocess
import sys
sys.path.append('/usr/local/lib/python2.7/site-packages/')
import rrdtool, tempfile
# Sensor-stuff
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
# RRD-stuff, not specific
startTime = int(time.time())
def read_temp_raw():
catdata = subprocess.Popen(['cat',device_file], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out,err = catdata.communicate()
out_decode = out.decode('utf-8')
lines = out_decode.split('\n')
return lines
def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string)/1000.0
print(int(temp_c))
print(int(time.time()))
rrdtool.update('dailyTemp.rrd','N:' + `temp_c`)
return temp_c
while True:
print(read_temp())
time.sleep(5)
我还没有实现创建到代码的图形还没有,但可以把它打印出来的读数为2小时以来搭配:
rrdtool graph temp120.png --end now --start end-7200s --width 400 \
DEF:ds0a=dailyTemp.rrd:temp:AVERAGE \
图形结果(工作正在进行中):只要我有需要的声誉添加图片(10)
给你+1让你10;) – Anuj 2013-04-08 19:02:22