Read this…
This one, while still undocumented, is a basic value parameter command…
EG. Input widget set to V0
BLYNK_WRITE(V0)
{
int value = param.asInt(); // Get value as integer... or...
// float value = param.asFloat(); // Get value as float, if using decimals.
Serial.print(" The value is: ");
Serial.println(value);
}
If you want to use the variable “value” outside of this function, then set it up as a global variable…
Note: The widget itself has multiple input options, an incremental or decremental value step (the value adjustable in the settings) or a direct value input.