Sample code for DHT11 senor without using library function

Projects Programming
1

Dear all,

I am using NodeMCU unit. Is there any sample code avilable to read DHT Sesor value without using library function. I have tested DHT11 with Arduino uno & its working fine. But it wont wont work with Simple DHT11 library.

Is There any sample code avilable for test it out.

2

But it wont wont work with Simple DHT11 library.

What is "it" that won't work?

3

I am testing below code with sesnor connected to pin 2

#include <SimpleDHT.h>

// for DHT11, 
//      VCC: 5V or 3V
//      GND: GND
//      DATA: 2
int pinDHT11 = 2;
SimpleDHT11 dht11;

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

void loop() {
  // start working...
  Serial.println("=================================");
  Serial.println("Sample DHT11...");
  
  // read without samples.
  byte temperature = 0;
  byte humidity = 0;
  int err = SimpleDHTErrSuccess;
  if ((err = dht11.read(pinDHT11, &temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
    Serial.print("Read DHT11 failed, err="); Serial.println(err);delay(1000);
    return;
  }
  
  Serial.print("Sample OK: ");
  Serial.print((int)temperature); Serial.print(" *C, "); 
  Serial.print((int)humidity); Serial.println(" H");
  
  // DHT11 sampling rate is 1HZ.
  delay(1500);
}

I get an error saying.

Sample DHT11...
Read DHT11 failed, err=101

Sample DHT11...
Read DHT11 failed, err=101

Sample DHT11...
Read DHT11 failed, err=101

Sample DHT11...
Read DHT11 failed, err=101

Sample DHT11...
Read DHT11 failed, err=101

Sample DHT11...
Read DHT11 failed, err=101

I have tested code using arduino Uno board and Its working fine . I have also tested giving separate 3.3v power and Gnd the result same. I have tested without library function it gives timeout error

4

You could try Adafruit's DHT Library.
If that doesn't "work" either, then just open up the library source code, figure out what it does, and then write your own code.