void Sensor_value() { server.handleClient(); humidity = dht.readHumidity(); temperature = dht.readTemperature(); } I want to make condition if temperature = null and Humidity= null that means the sensor fails to take reading so I want to return and take value again
The way to do this is:
float h = dht.readHumidity(); float t = dht.readTemperature(); float f = dht.readTemperature(true); if (isnan(h) || isnan(t) || isnan(f)) { Serial.println("Failed to read from DHT sensor!"); return; } See https://www.hackster.io/MisterBotBreak/how-to-use-temperature-and-humidity-dht-sensors-9e5975 and https://stackoverflow.com/questions/40874880/getting-nan-readings-from-dht-11-sensor.
NULL should only be used with pointers.
