How to include a float variable into string for IFTTT maked ulr trigger?

Projects Programming
1

I've got working Humidity sensor system based on this: Arduino code to trigger an IFTTT/Maker event · GitHub

Im trying to get a air humidity reading also frim my DHT11. Problem is that basic soil humidity sensors give easy analog data to include to my string like this:

  p = append_str(p, "{\"value1\":\"");
    p = append_ul(p, analogRead(READ_THIS_PIN));

But I cannot use the same way to add a float variable:

float humidity = dht.readHumidity();

to my string:

     p = append_str(p, "\",\"value3\":\"");
     p = append_str(p, humidity)'

Error says: error: cannot convert 'float' to 'char*' for argument '2' to 'char*

Sorry if I couldn't make my self clear enaugh. It's my first post and I don't really have no idea what I'm doing. :o

2

But I cannot use the same way to add a float variable:

float humidity = dht.readHumidity();

to my string:

Sure you can. You use dtostrf() first, and then add the string that dtostrf() populates to your string.

Or, you create a append_float() function.