Error using thingSpeakWrite Expected a string scalar or character vector for the parameter name.

I need to send data from MATLAB output to a field on ThingSpeak?

this is my current code.......

% Enter your MATLAB Code below

opts = weboptions('Timeout',15);
data = webread('https://api.thingspeak.com/apps/thinghttp/send_request?api_key=PC4EOCTMNDPPQOSW',opts)
writeChannelID = xxxxx;

% TODO - Enter the Write API Key between the '' below:
writeKey = 'xxxxxxxxxx';

thingSpeakWrite(writeChannelID, data, writeKey);

but it comes up with this in the output????

Lounge_Temp

18

Loft_Temp

6

Lounge_Humidity

62

Loft_Humidity

88

' must be a string scalar or character vector that can represent a field name.

Any ideas how to fix?

Answer 1

[ES]

Isnt this the API ? You missed the 'WriteKey' key in your API call?

thingSpeakWrite(channelID, data, 'WriteKey', writeAPIKey)

[Hans Scharler]

You are correct. 'WriteKey' is missing. Here's the documentation for thingSpeakWrite .