Can't sprinf double value for photon

[helxsz]

I use spintf to construct a text with int and double value and then publish it to the dashboard.

int a = 23; double b = 24.4; double c = 25.5; int d = 26;

sprintf( 
    publishString, 
    "{\"a\":\"%d\",\"b\":\"%.2f\",\"c\":\"%.2f\",\"d\":\"%d\"}", 
    a,b,c,d
);

it works well for core, however when it comes to photon, the dashboard doesn’t print any double value only the int value

[BulldogLowell]

there is lots on the forum on this. try searching “sprintf float photon” you will see there is a solution in the works, and a workaround.

[dougal]

Looks like it should be fixed in the next firmware release:

Issues with converting float to string with sprintf

Hi, I’m trying to convert a float to a string so I can publish temperatures to Spark. However, it seems that sprintf will convert the number as a null. Searching this forum seems to indicate that this should work. Casting the variable as an int also works so it appears to be an issue with floats/double. ##Sample code void setup() { Serial.begin(9600); } void loop() { delay(2000); char t1[20]; sprintf(t1, "Value: %.02", (double) 55.21); Serial.println(t1); Spark.pub…

[MisterNetwork]

@dougal

Looks like it should be fixed in the next firmware release:

deja vu!