I want to control the temperature with dht11. Use the Slider widget and specify the maximum heat and minimum heat. Will there be help for a sample project?
Type DHT11 into the search box.
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Bad title (I have adjusted it) & poor site documentation research… Look up and to the right of this page… see the words Sketch Builder, click on said words, choose hardware, choose DHT11 example, start Blynking 
There is even a video on the topic… Reading DHT11 sensor via Virtual Pins with Arduino Mega tutorial
BLYNK_WRITE(1) {
if (dht.readTemperature() < param.asInt()) {
digitalWrite(9, HIGH);
} else {
digitalWrite(9, LOW);
How can i control every second BLYNK_WRITE(1) value?