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by Bosse_B
Fri Dec 07, 2018 7:49 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

As you are finding; 433MHz RF can be a lot more complicated and difficult than it first seems. Right you are! I also tested my car key to see if it was indeed a 433 MHz device, and it was. But to my surprise the protocol for the key seems extremely simple! No wonder car thieves can easily record ke...
by Bosse_B
Fri Dec 07, 2018 11:15 am
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

I still have the receiver connected to my oscilloscope and I found that off the air there are seemingly other transmitter signals... It is hard to snatch because there is no way I have found to trigger on a reception because the receiver is outputting constant noise when there are no signal. I tried...
by Bosse_B
Wed Dec 05, 2018 11:17 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

Links in the description for the RTL-SDR Dongle did not work.
Seems to be a hard found item, at least for me in Sweden.
Is it not possible to use rtl_433 without an SDR dongle, just using a 433 MHz receiver hooked to a GPIO pin on the RPi?
by Bosse_B
Wed Dec 05, 2018 4:23 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

OK, that is what I figured too. It was really tedious work capturing the packets with the oscilloscope and then manually inspecting the waveforms for 1 or 0 values. I made 13 such deconings without being wiser except for the channel indicator bits I found inside the packet. If I had designed the pac...
by Bosse_B
Wed Dec 05, 2018 7:14 am
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

I planned on doing the detective work on the Pi but then porting the results over to Arduino using the ESP8266 WiFi module as target. The ESP is already present serving wired sensors (3 of them) but I cannot get access to install more sensor wires anymore, the construction is now closed up too much....
by Bosse_B
Tue Dec 04, 2018 10:22 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

Bump, double post edited
by Bosse_B
Tue Dec 04, 2018 9:20 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

I have hooked up the receiver on a breadboard now and connected an oscilloscope to its output. The situation is as follows: Whenever nothing is transmitting the receiver outputs a lot of noise. When I activate the Tx button on the temp/humid sensor the data on the receiver output stabilizes into a b...
by Bosse_B
Tue Dec 04, 2018 12:51 pm
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

Re: How to read weather station sensor over 433MHz?

Which is your problem To get the raw data stream into the RPi or to decode that into readable figures? If the latter then AFAIK there is no standard encoding used by all makers of sensors and stations. Getting the raw output into the Pi is just a matter of hooking the receiver output to a suitable ...
by Bosse_B
Tue Dec 04, 2018 10:45 am
Forum: General discussion
Topic: How to read weather station sensor over 433MHz?
Replies: 17
Views: 440

How to read weather station sensor over 433MHz?

I want to read the output (temp + humidity) of a couple of weather station sensors which use the 433 MHz frequency. I have a receiver like this: 433MHzRx.png The sensors are from a weather station (no brand except for the chain tha sell them) and they can be bought separately at a low cost. The labe...
by Bosse_B
Sat Dec 01, 2018 7:55 am
Forum: General discussion
Topic: How to install CVS server on a RPi3?
Replies: 11
Views: 1157

Re: How to install CVS server on a RPi3?

I do actually believe that importing old csv or svn repos into git is the preferable way to go. I also liked to the official documentation in case that was not an acceptable solution for some odd reason. Not a use case for organizations that have used CVS for many years and utilized the various "ad...
by Bosse_B
Sat Dec 01, 2018 7:41 am
Forum: General discussion
Topic: Bogus raspberry pi forum alert email??
Replies: 8
Views: 258

Re: Bogus raspberry pi forum alert email??

Please point the email links to the real forum URL:s instead of the other one!
by Bosse_B
Fri Nov 30, 2018 8:42 pm
Forum: General discussion
Topic: Bogus raspberry pi forum alert email??
Replies: 8
Views: 258

Re: Bogus raspberry pi forum alert email??

In that case why am I not logged on automatically? Really suspicious looking.
by Bosse_B
Fri Nov 30, 2018 8:20 pm
Forum: General discussion
Topic: Bogus raspberry pi forum alert email??
Replies: 8
Views: 258

Bogus raspberry pi forum alert email??

Today I got an alert email on a response to my over two years old thread about installing CVS on an RPi box. But when I click on the links in the email I am getting to a login page at a location I don't recognize at all (I have stripped off the ending URL part): https://lb.raspberrypi.org/forums/vie...
by Bosse_B
Fri Nov 30, 2018 8:06 pm
Forum: General discussion
Topic: How to install CVS server on a RPi3?
Replies: 11
Views: 1157

Re: How to install CVS server on a RPi3?

Did you note the time stamp of this thread? More than 2 years old....
Using Subversion now.
by Bosse_B
Mon Nov 26, 2018 10:48 pm
Forum: Automation, sensing and robotics
Topic: AM2302 DHT sensor ignoring sign of temperature....
Replies: 5
Views: 193

Re: AM2302 DHT sensor ignoring sign of temperature....

I have now modified my electronics box such that I added a 5V linear regulator to get a 5V supply for the sensors. So I changed the connection for the sensor power to this 5V from the 3.3V I used before. On each sensor line I also added a 1K pullup resistor to 5V plus a 3.3V zener diode to ground to...
by Bosse_B
Mon Nov 26, 2018 9:16 am
Forum: Automation, sensing and robotics
Topic: AM2302 DHT sensor ignoring sign of temperature....
Replies: 5
Views: 193

Re: AM2302 DHT sensor ignoring sign of temperature....

Read some more about BME280 sensors... Caveats: 1) I2C bus is a short range system, some pages suggest maximum 50 cm cables and I have 10 m distance... 2) The BME280 has a fixed address that can be hardware modified on one bit giving two possible addresses only. 3) It seems like the sensor boards ar...
by Bosse_B
Mon Nov 26, 2018 7:24 am
Forum: Automation, sensing and robotics
Topic: AM2302 DHT sensor ignoring sign of temperature....
Replies: 5
Views: 193

Re: AM2302 DHT sensor ignoring sign of temperature....

Thanks for the suggestion! My system uses 3 sensing points installed in the attic with up to 10m long 4-wire signal cables. The cables were put in place when the new roof was built in April and now only the end points are accessible through small hatches, so I am stuck with what I have... With the c...
by Bosse_B
Sun Nov 25, 2018 2:04 pm
Forum: Automation, sensing and robotics
Topic: AM2302 DHT sensor ignoring sign of temperature....
Replies: 5
Views: 193

AM2302 DHT sensor ignoring sign of temperature....

I have set up a monitoring system for my attic to check for excessive humidity (which could cause mulch developing). So I have wired 3 AM2302 DHT sensors at each end of the attic (20 m long) and the middle (where the electronics box resides). Readings are taken each 60 min and sent to my website MyS...
by Bosse_B
Sun Oct 21, 2018 9:20 am
Forum: General discussion
Topic: AM2302 DHT sensor on RPi3 not working after reboot of RPi
Replies: 6
Views: 263

Re: AM2302 DHT sensor on RPi3 not working after reboot of RPi

And yesterday I disabled (using sudo raspi-config) the 1Wire, I2C and SPI interfaces, which I previously enabled because of the instructions on this webpage . After this I switched back the cron job to using GPIO4 and waited. Turns out that now the RPi has performed a reading every 30 minutes for ov...
by Bosse_B
Sat Oct 20, 2018 5:34 am
Forum: General discussion
Topic: AM2302 DHT sensor on RPi3 not working after reboot of RPi
Replies: 6
Views: 263

Re: AM2302 DHT sensor on RPi3 not working after reboot of RPi

I have switched GPIO pin to use GPIO17 instead of GPIO4. Now the logging is not giving up, so it seems like GPIO4 (which is also used by the 1wire system) is not usable. At least not when 1wire is enabled.... The cron job has successfully operated every 30 minutes over night and across a scheduled R...
by Bosse_B
Fri Oct 19, 2018 10:40 am
Forum: General discussion
Topic: AM2302 DHT sensor on RPi3 not working after reboot of RPi
Replies: 6
Views: 263

Re: AM2302 DHT sensor on RPi3 not working after reboot of RPi

I thought that the problem was fixed by running the call to the py script as sudo (from AdaFruit's installation page), but unfortunately this was not the case. When I checked the log file I found that after a few successful measurements the DHT seemed to have locked up again and there was no output ...
by Bosse_B
Thu Oct 18, 2018 7:39 am
Forum: General discussion
Topic: AM2302 DHT sensor on RPi3 not working after reboot of RPi
Replies: 6
Views: 263

Re: AM2302 DHT sensor on RPi3 not working after reboot of RPi

Is it needed for the Adafruit DHT interface?
Is it somehow outputting data during boot that can lock up the DHT sensor?
by Bosse_B
Thu Oct 18, 2018 5:49 am
Forum: General discussion
Topic: AM2302 DHT sensor on RPi3 not working after reboot of RPi
Replies: 6
Views: 263

AM2302 DHT sensor on RPi3 not working after reboot of RPi

I have discovered a strange problem with a sensor I am deploying to my summer home in order to monitor temp/humidity over the winter. I have an RPi3 with the Adafruit_Python_DHT library installed and it worked just fine yesterday. Now following the nightly reboot of the RPi it has stopped working , ...
by Bosse_B
Tue Oct 16, 2018 4:05 pm
Forum: General discussion
Topic: AM2302 Temp/Humid sensor, improvement needed...
Replies: 1
Views: 99

Re: AM2302 Temp/Humid sensor, improvement needed...

OK, so I did not wait long enough... It turns out that after 39 s the call: ./AdafruitDHT.py 22 4 returns with an error message: Failed to get reading. Try again! Now I just need to figure out how I can set up a script that will log readings on a regular schedule with both a timestamp and the result...
by Bosse_B
Tue Oct 16, 2018 2:54 pm
Forum: General discussion
Topic: AM2302 Temp/Humid sensor, improvement needed...
Replies: 1
Views: 99

AM2302 Temp/Humid sensor, improvement needed...

I have a bunch of AM2302 sensors primarily used with ESP8266 WiFi modules as temp/humid sensors. Now I need to interface to an RPi3 and I found this webpage describing it all. I followed its directions on two RPi3 units with different versions of Raspbian and it seemed like the Adafruit_Python_DHT s...

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