in float you ,,,,f ,,,,should be small

When playing with a moisture sensor a while ago I found that you can supply power from one of the digital output pins, which you can of course control in code (the moisture sensors degrade quickly if kept constantly powered). I might try that with the DHT22.

Yes, I was also struggling with the “Failed to read from DHT sensor!” message, but after some googling I found something. On the page: https://github.com/mkjanke/ESP32-C3-Fanspeed I found out that the time critical code for the ESP32 is not protected. After changing the DHT.h file as indicated on the page, the values were reliably delivered.

Also thanks! This fixed it for me. I had the sensor wired to D5 in the ESP8266 and changed the code to use Pin14 and it worked fine.

// for DHT22,
// VCC: 5V or 3V
// GND: GND
// DATA: 2
int pinDHT22 = 4;
SimpleDHT22 dht22(pinDHT22);

void setup() {
Serial.begin(115200);
}

void loop() {
// start working…
Serial.println(“=================================”);
Serial.println(“Sample DHT22…”);

// read without samples.
// @remark We use read2 to get a float data, such as 10.1C
// if user doesn’t care about the accurate data, use read to get a byte data, such as 10C.
float temperature = 0;
float humidity = 0;
int err = SimpleDHTErrSuccess;
if ((err = dht22.read2(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
Serial.print(“Read DHT22 failed, err=”); Serial.print(SimpleDHTErrCode(err));
Serial.print(“,”); Serial.println(SimpleDHTErrDuration(err)); delay(2000);
return;
}

Serial.print(“Sample OK: “);
Serial.print((float)temperature); Serial.print(” *C, “);
Serial.print((float)humidity); Serial.println(” RH%”);

// DHT22 sampling rate is 0.5HZ.
delay(2500);
}

meaning that i need to use clk pin instead of D5 on my esp8266?

Brother!! Can’t be grateful enought for this!! I’ve been trying to figure this out since like 3 4 hours!! Your comment solved it! Have a good life Mate!!!