[rrd-users] pi rrdtool python temperature

[Tony Mountifield]

In article <1459239959578-7583334.post at n2.nabble.com>,
r100gs <s.soellner at gmail.com> wrote:
> Dear all, 
> 
> I´m new to python and rrdtool. I created the following python script to
> access some sensors on my raspberry. So, sensors are working fine and i get
> results in terminal. Now I tried to insert those data into an rrd databas
> but I always get the failure posted later on: 

I am not very familiar with Python, but it looks like an error in your Python code,
and not a problem with using RRD.
See below:

> Verwendete Sensoren: 
> 
> DHT22 (temperature, humidity) 
> BMP085 (pressure, temperature) 
> BH1750FVI (light) 
> 
> In the terminal I get: 
> 
> T1:	13.10 °C 
> Druck: 960.00 hPa 
> Druck NN: 1003.21 hPa 
> Helligkeit : 0.0 lx 
> T2:	12.40 °C 
> LF: 61.30 
> Traceback (most recent call last): 
> File „./wetter_sens_ab_rdd.py“, line 62, in 
> data1 = „N:%.2f:%.2f:%.2f:%.2f:%.2f:%.2f“ % (t1, t2, lf, druck, dnn, he1) 
> TypeError: float argument required, not function 

It's complaining about the type of one of those parameters.

> Using the script: 
> 
> #!/usr/bin/python 
> # -*- coding: utf-8 -*- 
> 
> from Adafruit_BMP085 import BMP085 
> import smbus 
> import time 
> import sys 
> import Adafruit_DHT 
> import re, os, rrdtool 
> 
> bmp = BMP085(0x77) 
> 
> bmp = BMP085(0x77, 3) # ULTRAHIRES Mode 
> 
> t1 = bmp.readTemperature() 
> 
> druckr = bmp.readPressure() 
> 
> altitude = 364 
> dnn = druckr / pow(1.0 – altitude/44330.0, 5.255) 
> 
> druck = druckr/100 
> 
> DEVICE = 0x23 # Default device I2C address 
> 
> POWER_DOWN = 0x00 # No active state 
> POWER_ON = 0x01 # Power on 
> RESET = 0x07 # Reset data register value 
> 
> CONTINUOUS_LOW_RES_MODE = 0x13 
> CONTINUOUS_HIGH_RES_MODE_1 = 0x10 
> CONTINUOUS_HIGH_RES_MODE_2 = 0x11 
> ONE_TIME_HIGH_RES_MODE_1 = 0x20 
> ONE_TIME_HIGH_RES_MODE_2 = 0x21 
> ONE_TIME_LOW_RES_MODE = 0x23 
> 
> bus = smbus.SMBus(1) # Rev 2 Pi uses 1 
> 
> def convertToNumber(data): 
> return ((data[1] + (256 * data[0])) / 1.2) 
> 
> def he1(addr=DEVICE): 
> data = bus.read_i2c_block_data(addr,ONE_TIME_HIGH_RES_MODE_1) 
> return convertToNumber(data) 

Here you have just defined he1 as a function.

> lf, t2 = Adafruit_DHT.read_retry(22, 14) 
> 
> print „T1: %.2f °C“ % t1 
> print „Druck: %.2f hPa“ % druck 
> print „Druck NN: %.2f hPa“ % (dnn / 100.0) 
> print „Helligkeit : “ + str(he1()) + “ lx“ 
> 
> if lf is not None and t2 is not None: 
> print „T2: %.2f °C“ % t2 
> print „LF: %.2f“ % lf #alt:print ‚T2 = {0:0.1f}°C LF = {1:0.1f}%‘.format(t2,
> lf) 
> else: 
> print ‚Lesefehler! Neu probieren‘ 
> sys.exit(1) 
> 
> data1 = „N:%.2f:%.2f:%.2f:%.2f:%.2f:%.2f“ % (t1, t2, lf, druck, dnn, he1) 

Here you are supplying he1 as an argument, without any () following it.
Python is complaining that you are passing the function itself, instead
of invoking it. Try using he1() instead.

> rrdtool.update( 
> „%s/wetter.rrd“ % (os.path.dirname(os.path.abspath(__file__))), 
> data1) 
> 
> end of script. 
> 
> RRD database: wetter.rrd I put some more sensores in case I want to add some
> additionl ones) 
> 
> temp 1 t1 
> temp 2 t2 
> temp 3 t3 
> temp 4 t4 
> 
> wind richtung wr 
> wind geschw wg 
> 
> Druck (NN) dnn 
> 
> regen 1 r1 
> regen 2 r2 
> regen 3 r3 
> luftfeuchte lf 
> 
> helligkeit he1 
> 
> Abfragen jede Minute, alle 60s 
> Speichern 10 Tage = 14400 Werte 
> dann reduzieren auf 1 Wert pro Tag 
> Aufbewahren 50 Jahre: 18000 Werte 
> 
> rrdtool create wetter.rrd \ 
> –step ’60‘ \ 
> ‚DS:t1:GAUGE:60:-40:80‘ \ 
> ‚DS:t2:GAUGE:60:-40:80‘ \ 
> ‚DS:t3:GAUGE:60:-40:80‘ \ 
> ‚DS:t4:GAUGE:60:-40:80‘ \ 
> ‚DS:wr:GAUGE:60:0:360‘ \ 
> ‚DS:wg:GAUGE:60:0:100‘ \ 
> ‚DS:dnn:GAUGE:60:850:1250‘ \ 
> ‚DS:r1:GAUGE:60:0:100‘ \ 
> ‚DS:r2:GAUGE:60:0:100‘ \ 
> ‚DS:r3:GAUGE:60:0:100‘ \ 
> ‚DS:lf:GAUGE:60:0:100‘ \ 
> ‚DS:he1:GAUGE:60:0:1000‘ \ 
> ‚RRA:AVERAGE:0.5:1:14400‘ \ 
> ‚RRA:MIN:0.5:1440:18000‘ \ 
> ‚RRA:MAX:0.5:1440:18000‘ \ 
> ‚RRA:AVERAGE:0.5:1440:18000‘ 
> 
> Maybe s.b. can give some hints. I´m really new to all this stuff, so I´m
> very happy to have the sensores running. Next step is to get a database and
> than get some nice graphs. 
> 
> 
> Best regardings, 
> Stefan

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org