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esp8266- DHT11

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in ESP8266 OLED Starter Kit by (270 points)
Once the DHT (temp. 23.4 / Humidity 45%) reads but when the DHT sensor is upgrading then the readings are (temp -12 / Humidity 158%) or NAN for both what is wrong? I have connect it according to what the code is saying, I am using this code 2018 by Daniel Eichhorn and open weather map
by (270 points)
Ome of the esp8266 is function perfekt another one some times is working next update then not vorking, I wonder if it have with the esp8266 to do

1 Answer

0 votes
by (10.0k points)
Can you please show your exact code here?
by (270 points)
#define TZ              +1      // (utc+) TZ in hours
#define DST_MN          60      // use 60mn for summer time in some countries

// Setup
const int UPDATE_INTERVAL_SECS = 10 * 60; // Update every 20 minutes

// Display Settings
const int I2C_DISPLAY_ADDRESS = 0x3c;
#define OLED_RESET -1
#if defined(ESP8266)
const int SDA_PIN = D2; //"D3;
const int SDC_PIN = D3; //"D4;
#else
const int SDA_PIN = D5; //D3;
const int SDC_PIN = D4; //D4;
#endif

// DHT Settings
#define DHTPIN D6    // NodeMCU pin 12 = D6 or pin 14 = D5
//#define DHTPIN D6 // Wemos D1R2 Mini
#define DHTTYPE DHT11  // DHT22  (AM2302), AM2321
char FormattedTemperature[10];
char FormattedHumidity[10];


// OpenWeatherMap Settings
// Sign up here to get an API key:
// https://docs.thingpulse.com/how-tos/openweathermap-key/
String OPEN_WEATHER_MAP_APP_ID = "0f2ab630b33fa101210179f4e96deef1";
/*
Go to https://openweathermap.org/find?q= and search for a location. Go through the
result set and select the entry closest to the actual location you want to display
data for. It'll be a URL like https://openweathermap.org/city/2657896. The number
at the end is what you assign to the constant below.
 */
String OPEN_WEATHER_MAP_LOCATION_ID = "2673730";

// Pick a language code from this list:
// Arabic - ar, Bulgarian - bg, Catalan - ca, Czech - cz, German - de, Greek - el,
// English - en, Persian (Farsi) - fa, Finnish - fi, French - fr, Galician - gl,
// Croatian - hr, Hungarian - hu, Italian - it, Japanese - ja, Korean - kr,
// Latvian - la, Lithuanian - lt, Macedonian - mk, Dutch - nl, Polish - pl,
// Portuguese - pt, Romanian - ro, Russian - ru, Swedish - se, Slovak - sk,
// Slovenian - sl, Spanish - es, Turkish - tr, Ukrainian - ua, Vietnamese - vi,
// Chinese Simplified - zh_cn, Chinese Traditional - zh_tw.
String OPEN_WEATHER_MAP_LANGUAGE = "se";
const uint8_t MAX_FORECASTS = 3;

const boolean IS_METRIC = true;

// Adjust according to your language
//const String WDAY_NAMES[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
const String WDAY_NAMES[] = {"SÖN", "MÅN", "TIS", "ONS", "TOR", "FRE", "LÖR"};
const String MONTH_NAMES[] = {"JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};

/***************************
 * End Settings
 **************************/
 // Initialize the oled display for address 0x3c
 // sda-pin=14 and sdc-pin=12
 SSD1306Wire     display(I2C_DISPLAY_ADDRESS, SDA_PIN, SDC_PIN);
 OLEDDisplayUi   ui( &display );

OpenWeatherMapCurrentData currentWeather;
OpenWeatherMapCurrent currentWeatherClient;

OpenWeatherMapForecastData forecasts[MAX_FORECASTS];
OpenWeatherMapForecast forecastClient;

#define TZ_MN           ((TZ)*60)
#define TZ_SEC          ((TZ)*3600)
#define DST_SEC         ((DST_MN)*60)
time_t now;

// flag changed in the ticker function every 10 minutes
bool readyForWeatherUpdate = false;
// flag changed in the ticker function every 1 minute
bool readyForDHTUpdate = false;

String lastUpdate = "--";

long timeSinceLastWUpdate = 0;

//declaring prototypes
void drawProgress(OLEDDisplay *display, int percentage, String label);
void updateData(OLEDDisplay *display);
void drawDateTime(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y);
void drawCurrentWeather(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y);
void drawForecast(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y);
void drawForecastDetails(OLEDDisplay *display, int x, int y, int dayIndex);
void drawHeaderOverlay(OLEDDisplay *display, OLEDDisplayUiState* state);
void drawIndoor(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y);
void setReadyForWeatherUpdate();

// Initialize the temperature/ humidity sensor
DHT dht(DHTPIN, DHTTYPE);
float humidity = 0.0;
float temperature = 0.0;

// Add frames
// this array keeps function pointers to all frames
// frames are the single views that slide from right to left
FrameCallback frames[] = { drawDateTime, drawCurrentWeather, drawForecast, drawIndoor };
int numberOfFrames = 4;

OverlayCallback overlays[] = { drawHeaderOverlay };
int numberOfOverlays = 1;

void setup() {
  Serial.begin(9600);
  Serial.println();
  Serial.println();

  // initialize dispaly
  display.init();
  display.clear();
  display.display();

  //display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setContrast(155);

  WiFi.begin(WIFI_SSID, WIFI_PWD);

  int counter = 0;
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    display.clear();
    display.drawString(64, 10, "Ansluter WiFi");
    display.drawXbm(46, 30, 8, 8, counter % 3 == 0 ? activeSymbole : inactiveSymbole);
    display.drawXbm(60, 30, 8, 8, counter % 3 == 1 ? activeSymbole : inactiveSymbole);
    display.drawXbm(74, 30, 8, 8, counter % 3 == 2 ? activeSymbole : inactiveSymbole);
    display.display();

    counter++;
  }
  // Get time from network time service
  configTime(TZ_SEC, DST_SEC, "pool.ntp.org");

  ui.setTargetFPS(30);

  ui.setActiveSymbol(activeSymbole);
  ui.setInactiveSymbol(inactiveSymbole);

  // You can change this to
  // TOP, LEFT, BOTTOM, RIGHT
  ui.setIndicatorPosition(BOTTOM);

  // Defines where the first frame is located in the bar.
  ui.setIndicatorDirection(LEFT_RIGHT);

  // You can change the transition that is used
  // SLIDE_LEFT, SLIDE_RIGHT, SLIDE_TOP, SLIDE_DOWN
  ui.setFrameAnimation(SLIDE_LEFT);

  ui.setFrames(frames, numberOfFrames);

  ui.setOverlays(overlays, numberOfOverlays);

  // Inital UI takes care of initalising the display too.
  ui.init();

  Serial.println("");

  updateData(&display);

}

void loop() {

  if (millis() - timeSinceLastWUpdate > (1000L*UPDATE_INTERVAL_SECS)) {
    setReadyForWeatherUpdate();
    timeSinceLastWUpdate = millis();
  }

  if (readyForWeatherUpdate && ui.getUiState()->frameState == FIXED) {
    updateData(&display);
  }

  if (readyForDHTUpdate && ui.getUiState()->frameState == FIXED)
    updateDHT();

  int remainingTimeBudget = ui.update();

  if (remainingTimeBudget > 0) {
    // You can do some work here
    // Don't do stuff if you are below your
    // time budget.
    delay(remainingTimeBudget);
  }


}

void drawProgress(OLEDDisplay *display, int percentage, String label) {
  display->clear();
  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->setFont(ArialMT_Plain_10);
  display->drawString(64, 10, label);
  display->drawProgressBar(2, 28, 124, 10, percentage);
  display->display();
}

void updateData(OLEDDisplay *display) {
  drawProgress(display, 10, "Uppdaterar Tid...");
  drawProgress(display, 30, "Uppdaterar Väder...");
  currentWeatherClient.setMetric(IS_METRIC);
  currentWeatherClient.setLanguage(OPEN_WEATHER_MAP_LANGUAGE);
  currentWeatherClient.updateCurrentById(&currentWeather, OPEN_WEATHER_MAP_APP_ID, OPEN_WEATHER_MAP_LOCATION_ID);
  drawProgress(display, 50, "Uppdaterar Prognos...");
  forecastClient.setMetric(IS_METRIC);
  forecastClient.setLanguage(OPEN_WEATHER_MAP_LANGUAGE);
  uint8_t allowedHours[] = {12};
  forecastClient.setAllowedHours(allowedHours, sizeof(allowedHours));
  forecastClient.updateForecastsById(forecasts, OPEN_WEATHER_MAP_APP_ID, OPEN_WEATHER_MAP_LOCATION_ID, MAX_FORECASTS);

  readyForWeatherUpdate = false;
  drawProgress(display, 100, "Klart...");
  delay(1000);

  drawProgress(display, 70, "Uppdaterar Sensorn");
  humidity = dht.readHumidity();
  drawProgress(display, 80, "Uppdaterar Sensorn");
  temperature = dht.readTemperature(!IS_METRIC);
  delay(2000);
}

// Called every 1 minute
void updateDHT() {
  humidity = dht.readHumidity();
  temperature = dht.readTemperature(!IS_METRIC);
  readyForDHTUpdate = false;
}



void drawDateTime(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y) {
  now = time(nullptr);
  struct tm* timeInfo;
  timeInfo = localtime(&now);
  char buff[16];


  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->setFont(ArialMT_Plain_10);
  String date = WDAY_NAMES[timeInfo->tm_wday];

  sprintf_P(buff, PSTR("%s, %02d/%02d/%04d"), WDAY_NAMES[timeInfo->tm_wday].c_str(), timeInfo->tm_mday, timeInfo->tm_mon+1, timeInfo->tm_year + 1900);
  display->drawString(64 + x, 5 + y, String(buff));
  display->setFont(ArialMT_Plain_24);

  sprintf_P(buff, PSTR("%02d:%02d:%02d"), timeInfo->tm_hour, timeInfo->tm_min, timeInfo->tm_sec);
  display->drawString(64 + x, 15 + y, String(buff));
  display->setTextAlignment(TEXT_ALIGN_LEFT);
}

void drawCurrentWeather(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y) {
  display->setFont(ArialMT_Plain_10);
  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->drawString(64 + x, 38 + y, currentWeather.description);

  display->setFont(ArialMT_Plain_24);
  display->setTextAlignment(TEXT_ALIGN_LEFT);
  String temp = String(currentWeather.temp, 1) + (IS_METRIC ? "°C" : "°F");
  display->drawString(60 + x, 5 + y, temp);

  display->setFont(Meteocons_Plain_36);
  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->drawString(32 + x, 0 + y, currentWeather.iconMeteoCon);
}


void drawForecast(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y) {
  drawForecastDetails(display, x, y, 0);
  drawForecastDetails(display, x + 44, y, 1);
  drawForecastDetails(display, x + 88, y, 2);
}

void drawForecastDetails(OLEDDisplay *display, int x, int y, int dayIndex) {
  time_t observationTimestamp = forecasts[dayIndex].observationTime;
  struct tm* timeInfo;
  timeInfo = localtime(&observationTimestamp);
  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->setFont(ArialMT_Plain_10);
  display->drawString(x + 20, y, WDAY_NAMES[timeInfo->tm_wday]);

  display->setFont(Meteocons_Plain_21);
  display->drawString(x + 20, y + 12, forecasts[dayIndex].iconMeteoCon);
  String temp = String(forecasts[dayIndex].temp, 0) + (IS_METRIC ? "°C" : "°F");
  display->setFont(ArialMT_Plain_10);
  display->drawString(x + 20, y + 34, temp);
  display->setTextAlignment(TEXT_ALIGN_LEFT);
}

void drawIndoor(OLEDDisplay *display, OLEDDisplayUiState* state, int16_t x, int16_t y) {
  display->setTextAlignment(TEXT_ALIGN_CENTER);
  display->setFont(ArialMT_Plain_10);
  display->drawString(64 + x, 0, "Inomhus");
  display->setFont(ArialMT_Plain_16);
  dtostrf(temperature,4, 1, FormattedTemperature);
  display->drawString(64 + x, 12, "Temp:" + String(FormattedTemperature) + (IS_METRIC ? "°C": "°F"));
  dtostrf(humidity,4, 1, FormattedHumidity);
  display->drawString(64+x, 30, "Fukt:" + String(FormattedHumidity) + "%");

}

void drawHeaderOverlay(OLEDDisplay *display, OLEDDisplayUiState* state) {
  now = time(nullptr);
  struct tm* timeInfo;
  timeInfo = localtime(&now);
  char buff[14];
  sprintf_P(buff, PSTR("%02d:%02d"), timeInfo->tm_hour, timeInfo->tm_min);

  display->setColor(WHITE);
  display->setFont(ArialMT_Plain_10);
  display->setTextAlignment(TEXT_ALIGN_LEFT);
  display->drawString(0, 54, String(buff));
  display->setTextAlignment(TEXT_ALIGN_RIGHT);
  String temp = String(currentWeather.temp, 1) + (IS_METRIC ? "°C" : "°F");
  display->drawString(128, 54, temp);
  display->drawHorizontalLine(0, 52, 128);
}

void setReadyForWeatherUpdate() {
  Serial.println("Setting readyForUpdate to true");
  readyForWeatherUpdate = true;
}

void setReadyForDHTUpdate() {
  Serial.println("Setting readyForDHTUpdate to true");
  readyForDHTUpdate = true;
}
by (10.0k points)
The code looks ok, although it looks as if the sensor might be read too often. Can you comment out ("//") this lines:
  drawProgress(display, 70, "Uppdaterar Sensorn");
  humidity = dht.readHumidity();
  drawProgress(display, 80, "Uppdaterar Sensorn");
  temperature = dht.readTemperature(!IS_METRIC);
  delay(2000);

If that doesn't help, please try to start with a minimal sample only reading the dht sensor and writing the output to the console....
by (270 points)
to remout those lines did not help. I have run an dht11 and in the serial monitor it reads humidity 42% and temp 23,2
this is the code I use to check the sensor:
#include "DHT.h"        // including the library of DHT11 temperature and humidity sensor
#define DHTTYPE DHT11   // DHT 11

#define dht_dpin D5
DHT dht(dht_dpin, DHTTYPE);
void setup(void)
{
  dht.begin();
  Serial.begin(9600);
  Serial.println("Humidity and temperature \n\n");
   Serial.println("==========================================");
  delay(1000);

}
void loop() {
    float h = dht.readHumidity();
    float t = dht.readTemperature();         
    Serial.print("Current humidity = ");
    Serial.print(h);
    Serial.print("%  ");
    Serial.print("temperature = ");
    Serial.print(t);
    Serial.println("C  ");
  delay(2000);
}
by (270 points)
But now when I run the orginal code then it works perfect how come?
by (10.0k points)
Not sure... So the problem is solved?
by (270 points)
I have 4 esp8266 and dht11 2 of then is runing perfect but the other 2 does not
why? I have exact the same configuration on all 4 testet all dht with code above
and the are working can it be esp8366 that make the wrong result

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