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I want to control the level my water tank with a esp8266 and Thingspeak.
I can see the level in Thingspeak. This is working.
Now I want to send 2 emails :
- One daily email with the actual level
- Alarm email when level is below a setpoint.
How can I incorporate the value from a channel in the email ?
What I have now for the daily email , but with errors :
alert_body = 'huidig peil regenput';
channelID = ..........;
% Provide the ThingSpeak alerts API key. All alerts API keys start with TAK.
alertApiKey = 'TAK...............';
% 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("Niveau regenput " );
% Read the recent data.
peil = thingSpeakRead(channelID,'Fields',1);
% Check to make sure the data was read correctly from the channel.
% Set the outgoing message
webwrite(alertUrl , "body", alertBody, "subject", alertSubject,'Fields',peil);
% Catch errors so the MATLAB code does not disable a TimeControl if it fails
try
webwrite(alertUrl , "body", alert_body, "subject", alertSubject, options);
catch someException
fprintf("Failed to send alert: %s\n", someException.message);
end
The errors I receive :
Unrecognized function or variable 'alert_Body'.
Error in Read Channel to Trigger Email 1 (line 24)
webwrite(alertUrl , "body", alert_Body, "subject", alertSubject,"Fields",peil);
Manny thanks in advance
