Hi there, I am trying to reach out to anyone who has successfully completed the project of building a weather station using an Arduino MKRFOX1200 board, a dht11 sensor across the Sigfox and Thingspeak networks. I’ve been attempting to build the weather station over the SigFox and things.io network for over a year now but I was unsuccessful. I then found this tutorial on how to build this using Thingspeak: https://create.arduino.cc/projecthub/masteruan/arduino-mkr-fox-1200-sigfox-meteo-station-423609 . I have now been attempting to build it using this network but am still unsuccessful.
My SigFox and arduino is working. I made the arduino code convert temperature to Celsius (rather than Kelvin which is what the tutorial does). However, I am unable to access the location of the device on Thingspeak (my SigFox atlas is activated) and I am getting humidity values of approximately -30k. Please may someone assist me or give me a detailed approach on how to fix these issues. My goal is to have my thingspeak like this: https://thingspeak.com/channels/227248. I have followed the tutorial and projecthub but I cannot figure out why I am obtaining a confusing humidity reading. Please please may someone help.
Thank you so much for your time.
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This sounds like a hardware problem more than a ThingSpeak problem. You could try the projecthub if they have a forum or perhaps Arduino, though that is a stretch again since the problem seems to be with the sensor. I recomend drastic simplification. Write a program to read the sensor from your Arduino and output it to the serial monitor. Once you have that working, add another layer of complexity one at a time.
Hi there, that makes sense, I will do that, thank you. However, I also wanted to know if you knew how to sned the location of the device per reading from Sigfox to Thingspeak (my Sigfox Atlas is enabled). I have found sources to do this with thethings.io but i am unsure on how to do it using thingspeak. When i try to do the "channel location" option on thingspeak, it gives me a default poaition og Lat.=0 and Long.=0. However, on my "device" tab on Sigfox, i can see a pretty accurate computed location of where my device is. How do I send this to Thingspeak? I am unsure on how to create a callback for this. Please may you assist if you can.
Thank you
The channel location is the base location of the device, such as your business or home. The device location parameters are in the channel feed data. See the Write data documentation for the parameters.
https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=10&lat=40.2&long=50.1&elevation=200
Here is code to create a map from that data. You can create a MATLAB visualization to run this code and add it to your channel. Note the change from the word alititude to elevation. I modified this code from a different application, so if you get errors please let me know so I can fix it.
myChannel=999999999999999;
ReadAPIKey='xxxxxxxxxxxxxxxx';
myData=thingSpeakRead(myChannel,'ReadKey', ReadAPIKey,'numpoints',260,'outputformat','timetable','location',1);
myVector=(myData.Latitude).^2+(myData.Longitude).^2+myData.Altitude.^2;
maxVector=max(myData.Latitude)^2+max(myData.Longitude)^2+max(myData.Altitude)^2;
myVector=myVector/maxVector;
myMap=geoscatter(myData.lat,myData.long,15,myVector,'filled');
geobasemap('satellite');
colormap jet;
%ax=gca;
%ax.ZoomLevel=15; %probably dont need this since scale is set above
Thank you very much for this helpful response. Will this line of code (https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=10&lat=40.2&long=50.1&elevation=200) be the Sigfox callback?
Also, when running the MATLAB visualization code, i get the following error: "Channel ID must be a positive integer." . However, I do not see where my Channel ID is being used (nor where it could be a negative or not an integer). How could i ammend this? Or where is it reading my channel ID?
Sorry, I've never used Sigfox, I probably should check it out. If you find out, please let us know.
Regarding the error the channel ID is the first line in the code. The channel ID must exist.
myChannel=999999999999999;
Channel 999999999999999 does not exist. Change it to your channel ID. Also be sure to change the Read API key.
So where would the line: "https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=10&lat=40.2&long=50.1&elevation=200" be used? As previously I would have assumed it to be a SigFox callback
And I see, thank you. I got this error: "Warning: 'Unable to read 260 points as requested. Only 68 points available in the channel. Error using . Unrecognized table variable name 'lat'." Where could I change the number of points? Would it affect the output? Also, where can i define the variable "lat"?
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