[Solved] DHT Weired Values

Other Hardware Sensors
1

Hi everyone. I have here a problem witch never see.

In this image is the values of Dht11 sensor.

274351807_495488582021407_5077612175784539087_n
274351807_495488582021407_5077612175784539087_n1536×2048 224 KB

274235632_341205804586315_9034948876520424393_n
274235632_341205804586315_9034948876520424393_n2048×1536 417 KB

Code is exaples DHT11.

//
//    FILE: dht11_test.ino
//  AUTHOR: Rob Tillaart
// PURPOSE: DHT library test sketch for DHT11 && Arduino
//     URL: https://github.com/RobTillaart/DHTlib


#include <dht.h>

dht DHT;

#define DHT11_PIN     10


void setup()
{
  Serial.begin(115200);
  Serial.println("DHT TEST PROGRAM ");
  Serial.print("LIBRARY VERSION: ");
  Serial.println(DHT_LIB_VERSION);
  Serial.println();
  Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
}


void loop()
{
  // READ DATA
  Serial.print("DHT11, \t");
  int chk = DHT.read11(DHT11_PIN);
  switch (chk)
  {
    case DHTLIB_OK:  
    Serial.print("OK,\t"); 
    break;
    case DHTLIB_ERROR_CHECKSUM: 
    Serial.print("Checksum error,\t"); 
    break;
    case DHTLIB_ERROR_TIMEOUT: 
    Serial.print("Time out error,\t"); 
    break;
    case DHTLIB_ERROR_CONNECT:
        Serial.print("Connect error,\t");
        break;
    case DHTLIB_ERROR_ACK_L:
        Serial.print("Ack Low error,\t");
        break;
    case DHTLIB_ERROR_ACK_H:
        Serial.print("Ack High error,\t");
        break;
    default: 
    Serial.print("Unknown error,\t"); 
    break;
  }
  // DISPLAY DATA
  Serial.print(DHT.humidity, 1);
  Serial.print(",\t");
  Serial.println(DHT.temperature, 1);

  delay(2000);
}


// -- END OF FILE --

What can I do???

2

Did you remember to change the serial monitor line speed?

3

I'm impressed that the code you have shown could write anything at all on that display.

4

The code from LCD is:

#include <LiquidCrystal.h>
#include <dht.h>
#include <DS3232RTC.h>  
#include <Adafruit_Sensor.h>
#include <SPI.h>
#include <Wire.h>
#include <nRF24L01.h>
#include <printf.h>
#include <RF24.h>
#include <RF24_config.h>
#include <DS3231.h>

dht DHT;                   //create DHT object
#define DHT11_PIN   10        //DHT11 senzor
#define DHTTYPE DHT11 
int chk;
float hum;
float temperature[2];
String inTemp, inHum, outTemp, outHum;
int readDHT11, t, h;
double Fahrenheit(double celsius) {
return ((double)(9 / 5) * celsius) + 32;
}
double Kelvin(double celsius) {
return celsius + 273.15;
}

DS3231 rtc(SDA, SCL);       //create DS3231 object

RF24 radio(8, 9);          //8 for CE, 9 for CSN
const byte address[6] = "00001";

char text[6] = "";

const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

 void setup()
 {
  lcd.begin(16, 2);
  
  rtc.begin();                    //initialize the rtc
  rtc.setDOW(FRIDAY);             //set Day
  rtc.setTime(12, 0, 0);          //set Time
  rtc.setDate(1, 1, 2022);        //set Date
  
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();

  lcd.setCursor(0, 0);
  lcd.print("Statie Meteo 2.0");
  delay(5000);
  lcd.clear();
  lcd.setCursor(2, 0);
  lcd.print("Developed By");
  lcd.setCursor(2, 1);
  lcd.print("  Serafim");
  delay(3000);
  lcd.clear();
  lcd.print("Pornire....");
  delay(3000);
  lcd.clear();
 }

 void loop() {

 { 
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  lcd.print(rtc.getDateStr());     //print date
  
  lcd.setCursor(0, 1);
  lcd.print("Time:");
  lcd.print(rtc.getTimeStr());
  delay(5000);
  lcd.clear();
 }

 {
  int chk = DHT.read11(DHT11_PIN);

  lcd.setCursor(0, 0);
  lcd.print("Indoor:");
  lcd.setCursor(0, 9);
  Serial.print(DHT.temperature);
  lcd.print(DHT.temperature);
  lcd.print((char)178);
  lcd.print("C");
 }
 
  if ( radio.available() ) {
 radio.read(&text, sizeof(text)); // Read incoming data
    outTemp = String(text[0]) + String(text[1]) + char(176) + "C"; // Outdoor Temperature
    outHum = String(text[2]) + String(text[3]) + "%"; // Outdoor Humidity
  

lcd.setCursor(0, 0);
lcd.print("Temp");
lcd.setCursor(0, 1);
lcd.print("Humidity");
lcd.setCursor(0,9);
lcd.print(outTemp);
lcd.print(" C");
lcd.setCursor(9, 10);
lcd.print(outHum);
lcd.print( "%");
delay(10000);
  }
 }
5

No result...

6

It was worth a try - difficult to tell what it was set to from a crappy picture.

Good luck.

7

That is from the code in post #4 but there does not appear to be a matching Serial.begin() statement.

Also, you appear to have two DS3231 libraries defined. One usually is enough.

8

I solve this error with this video...

9

See also reply #2

10

Hi again bro!

How can I change lcd bund speed to 9600??

11

Do you have a serial LCD?
Because if not, the question makes little sense.

12

Note just a regular lcd 1602

13

In which case, it isn't a serial device, so the answer is "you can't".

14

But How can I make dht values to apeear like on serial monitor. The write is still like in photo.

15

Does your simple LCD "hello world" sketch display correctly, as you expect?

16

Start looking here. Bear in mind that these are the arguments for setCursor:
lcd.setCursor(col, row)
You seem to have some odd looking values for a 16*2 display

17

Thanks a lot man! Now is working very good!!

18

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