Upload Matlab Analysis Code

ExtraCode/MatlabAnalysis.txt

+
+% Store the channel ID for the moisture sensor channel.
+channelID = 1563035;
+
+% Provide the ThingSpeak alerts API key.  All alerts API keys start with TAK.
+alertApiKey = 'TAK66YQB9950YAY8WB7NM';
+
+% Set the address for the HTTTP call
+alertUrl="https://api.thingspeak.com/alerts/send";
+
+% webwrite uses weboptions to add required headers.  Alerts needs a ThingSpeak-Alerts-API-Key header.
+options = weboptions("HeaderFields", ["ThingSpeak-Alerts-API-Key", alertApiKey ]);
+
+% Set the email subject.
+alertSubject = sprintf("Air Pollution information");
+
+% Read the recent data.
+pollData = thingSpeakRead(channelID,'NumDays',30,'Fields',1);
+
+% Check to make sure the data was read correctly from the channel.
+if isempty(pollData)
+    alertBody = ' No data read from sensor. ';      
+else
+    % Get the most recent point in the array of moisture data.
+    lastValue = pollData(end); 
+
+    % Set the outgoing message
+    if (lastValue>=50 & lastValue < 150)
+        alertBody = ' Warning: pollution in your area is above a normal level. ';
+        try
+            webwrite(alertUrl, "body", alertBody, "subject", alertSubject, options);
+        catch someException
+            fprintf("Failed to send alert%s\n",someException.message);
+        end
+    end
+    if (lastValue > 150)
+        alertBody = ' Warning: pollution in your area is above a toxic level. ';
+        try
+            webwrite(alertUrl, "body", alertBody, "subject", alertSubject, options);
+        catch someException
+            fprintf("Failed to send alert%s\n",someException.message);
+        end
+    end
+end
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