RTL-SDR rtl_433

[Woeka]

Is it possible to get the sdr-rtl stick supported?

It's cheap (http://www.aliexpress.com/af/rtl2832u.html, €7), readily available and easy to install on a raspberry pi.
It got a list of 49 devices supported at the moment (https://github.com/merbanan/rtl_433).

Code: Select all

pi@raspberrypi:~ $ rtl_433 -R 12
Registering protocol "Oregon Scientific Weather Sensor"
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
Sample rate set to 250000.
Bit detection level set to 8000.
Tuner gain set to Auto.
Reading samples in async mode...
Tuned to 433920000 Hz.
2016-03-22 23:14:35 :   Weather Sensor THGR122N
        House Code:      198
        Channel:         1
        Battery:         OK
        Temperature:     18.30 C
        Humidity:        55 %
2016-03-22 23:14:35 :   Weather Sensor THGR122N
        House Code:      198
        Channel:         1
        Battery:         OK
        Temperature:     18.30 C
        Humidity:        55 %

[Woeka]

Hi,

I've wrote some code to get the Oregon Scientific Weather Sensor into Domoticz using the RTL_433 code from https://github.com/merbanan/rtl_433. Currently supporting 54 different 433mhz sensors.

Install the following:

• Install rl-sdr, http://sdr.osmocom.org/trac/wiki/rtl-sdr
• Install rtl_433, https://github.com/merbanan/rtl_433
• Install screen,

  Code: Select all

  pi@raspberrypi:~$ sudo apt-get install screen

Run the following code to create a logfile from the output of rtl_433

Code: Select all

pi@raspberrypi:~$ screen
pi@raspberrypi:~$ rtl_433 -R 12 -q -F csv > /home/pi/log/rtl_output.csv

Open the logfile and get the ID's from the sensors, create the corresponding virtual sensors and note the IDX

Create a python-script with the following code and change the necessary variables to your settings, server location, ID's etc. :

Code: Select all

import time
import urllib

def follow(thefile):
    thefile.seek(0,2)
    while True:
        line = thefile.readline()
        if not line:
            time.sleep(0.1)
            continue
        yield line

if __name__ == '__main__':
    
    ID = ['32','198','220'] #ID's of weather sensors
    IDX = [12,13,14] #corresonding IDX in Domoticz

    Server = "http://10.5.0.131:8080" #location of Domoticz server
    Log = "/home/pi/log/rtl_output.csv" #location of logfile
    msg = "RTL_update" #message shows up in log


    #Start rtl_433 with the following options for the Oregon Scientific Weather Sensor:
    #pi@raspberrypi:~$ rtl_433 -R 12 -q -F csv > /home/pi/log/rtl_output.csv
    logfile = open(Log,"r")
    loglines = follow(logfile)

    last_id = ""
    last_time = time.time()

    for line in loglines:
        try:
            #2016-06-17 15:11:07,Weather Sensor THGR122N,32,2,LOW,24.200,46,,
            #date,name,ID,channel,battery status,temperature,humidity,rain,rain?

            my_list = line.split(',')
            current_id = my_list[2]

            if (last_id != current_id) or (float(time.time())-float(last_time) > 20):  #send info to Domoticz when ID is different or the last info was send more then 20 sec ago
                #print ( str(Server) + "/json.htm?type=command&param=udevice&idx=" + str(IDX[int(ID.index(my_list[2]))]) + "&nvalue=0&svalue=" + my_list[5] + ";" + my_list[6] + ";0" )
                httpresponse = urllib.urlopen( str(Server) + "/json.htm?type=command&param=udevice&idx=" + str(IDX[int(ID.index(my_list[2]))]) + "&nvalue=0&svalue=" + my_list[5] + ";" + my_list[6] + ";0" )

                #send message to domoticz log
                httpresponse = urllib.urlopen( str(Server) + "/json.htm?type=command&param=addlogmessage&message=" + msg)
                
                last_id = current_id
                last_time = time.time()
                print ("Info send")
        except:
            print ("Error occured.")

Start a screen and run it.

When everything is going as planned the data should be coming in.

2DO

• Use logrotate to reduce filesize

[stuiow]

Looking into maybe running this to gather data from my oil tank sensor.
I have the basics setup.
By doing what you have mentioned, can i run the code then close the telnet session to let it carry on in the background?

[Woeka]

I just run it indefinitely in a screen session.

[stuiow]

Is a screen session just something that runs in teh background on the system? Sorry to ask a daft question - not to sure on that.

Also, what system do you run it on. I will run it on a Pi2 and am concerned about the extra CPU that running rtl_433 will bring.
My thinking is to upgrade to pi3 possibly if my concern is warranted.

[Woeka]

Start screen and program. Close screen with crtl-A and D.

rtl_433 takes up around 10% cpu on my RPi2.