DHT22
ESP32 With DHT11/ DHT22 Humidity & Temperature Sensor
Code[edit]
Afficher un texte sur le moniteur Serial
PIN 15 (autres PIN possibles le 16,17,27)
DHT11 error status: CHECKSUM
Temperature:24.60 °C
Humidite:38.40 %
#include "DHTesp.h" // Click here to get the library: http://librarymanager/All#DHTesp
#include <Ticker.h>
#ifndef ESP32
#pragma message(THIS EXAMPLE IS FOR ESP32 ONLY!)
#error Select ESP32 board.
#endif
/**************************************************************/
/* Example how to read DHT sensors from an ESP32 using multi- */
/* tasking. */
/* This example depends on the Ticker library to wake up */
/* the task every 20 seconds */
/**************************************************************/
DHTesp dht;
void tempTask(void *pvParameters);
bool getTemperature();
void triggerGetTemp();
/** Task handle for the light value read task */
TaskHandle_t tempTaskHandle = NULL;
/** Ticker for temperature reading */
Ticker tempTicker;
/** Comfort profile */
ComfortState cf;
/** Flag if task should run */
bool tasksEnabled = false;
/** Pin number for DHT11 data pin */
int dhtPin = 15;
/**
* initTemp
* Setup DHT library
* Setup task and timer for repeated measurement
* @return bool
* true if task and timer are started
* false if task or timer couldn't be started
*/
bool initTemp() {
byte resultValue = 0;
// Initialize temperature sensor
dht.setup(dhtPin, DHTesp::DHT11);
Serial.println("DHT initiated");
// Start task to get temperature
xTaskCreatePinnedToCore(
tempTask, /* Function to implement the task */
"tempTask ", /* Name of the task */
4000, /* Stack size in words */
NULL, /* Task input parameter */
5, /* Priority of the task */
&tempTaskHandle, /* Task handle. */
1); /* Core where the task should run */
if (tempTaskHandle == NULL) {
Serial.println("Failed to start task for temperature update");
return false;
} else {
// Start update of environment data every 20 seconds
tempTicker.attach(20, triggerGetTemp);
}
return true;
}
/**
* triggerGetTemp
* Sets flag dhtUpdated to true for handling in loop()
* called by Ticker getTempTimer
*/
void triggerGetTemp() {
if (tempTaskHandle != NULL) {
xTaskResumeFromISR(tempTaskHandle);
}
}
/**
* Task to reads temperature from DHT11 sensor
* @param pvParameters
* pointer to task parameters
*/
void tempTask(void *pvParameters) {
Serial.println("tempTask loop started");
while (1) // tempTask loop
{
if (tasksEnabled) {
// Get temperature values
getTemperature();
}
// Got sleep again
vTaskSuspend(NULL);
}
}
/**
* getTemperature
* Reads temperature from DHT11 sensor
* @return bool
* true if temperature could be aquired
* false if aquisition failed
*/
bool getTemperature() {
// Reading temperature for humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
TempAndHumidity newValues = dht.getTempAndHumidity();
// Check if any reads failed and exit early (to try again).
if (dht.getStatus() != 0) {
Serial.println("DHT11 error status: " + String(dht.getStatusString()));
return false;
}
float heatIndex = dht.computeHeatIndex(newValues.temperature, newValues.humidity);
float dewPoint = dht.computeDewPoint(newValues.temperature, newValues.humidity);
float cr = dht.getComfortRatio(cf, newValues.temperature, newValues.humidity);
String comfortStatus;
switch(cf) {
case Comfort_OK:
comfortStatus = "Comfort_OK";
break;
case Comfort_TooHot:
comfortStatus = "Comfort_TooHot";
break;
case Comfort_TooCold:
comfortStatus = "Comfort_TooCold";
break;
case Comfort_TooDry:
comfortStatus = "Comfort_TooDry";
break;
case Comfort_TooHumid:
comfortStatus = "Comfort_TooHumid";
break;
case Comfort_HotAndHumid:
comfortStatus = "Comfort_HotAndHumid";
break;
case Comfort_HotAndDry:
comfortStatus = "Comfort_HotAndDry";
break;
case Comfort_ColdAndHumid:
comfortStatus = "Comfort_ColdAndHumid";
break;
case Comfort_ColdAndDry:
comfortStatus = "Comfort_ColdAndDry";
break;
default:
comfortStatus = "Unknown:";
break;
};
// Serial.println(" T:" + String(newValues.temperature) + " H:" + String(newValues.humidity) + " I:" + String(heatIndex) + " D:" + String(dewPoint) + " " + comfortStatus);
Serial.println(" Témpérature : " + String(newValues.temperature) + "°C");
Serial.println(" Humidité : " + String(newValues.humidity) + "%");
return true;
}
void setup()
{
Serial.begin(115200);
Serial.println();
Serial.println("DHT ESP32 example with tasks");
initTemp();
// Signal end of setup() to tasks
tasksEnabled = true;
}
void loop() {
if (!tasksEnabled) {
// Wait 2 seconds to let system settle down
delay(2000);
// Enable task that will read values from the DHT sensor
tasksEnabled = true;
if (tempTaskHandle != NULL) {
vTaskResume(tempTaskHandle);
}
}
yield();
}
#include "DHT.h"
#define DHT_SENSOR_PIN 14 // ESP32 pin GPIO14 connected to DHT22 sensor
#define DHT_SENSOR_TYPE DHT22
DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);
void setup() {
Serial.begin(9600);
dht_sensor.begin(); // initialize the DHT sensor
}
void loop() {
// read humidity
float humi = dht_sensor.readHumidity();
// read temperature in Celsius
float tempC = dht_sensor.readTemperature();
// read temperature in Fahrenheit
float tempF = dht_sensor.readTemperature(true);
// check whether the reading is successful or not
if ( isnan(tempC) || isnan(tempF) || isnan(humi)) {
Serial.println("Failed to read from DHT sensor!");
} else {
Serial.print("Humidity: ");
Serial.print(humi);
Serial.print("%");
Serial.print(" | ");
Serial.print("Temperature: ");
Serial.print(tempC);
Serial.print("°C ~ ");
Serial.print(tempF);
Serial.println("°F");
}
// wait 1 second between readings
delay(1000);
}
Voici un autre code | il fonctione avec DHT11
PIN 15
source : https://www.makerguides.com/esp32-dht11-dht22-humidity-temperature-sensor/
// Example testing sketch for various DHT humidity/temperature sensors written by ladyada
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
#define DHTPIN 15 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
// Uncomment whatever type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino, Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize the DHT sensor.
// Note that older versions of this library took an optional third parameter to
//Tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println(F("DHTxx test!"));
dht.begin();
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
}
DHT11 & Affichage OLED
source : https://www.makerguides.com/esp32-dht11-dht22-humidity-temperature-sensor/
mais modifié pour afficher sur l'OLED
// Example testing sketch for various DHT humidity/temperature sensors written by ladyada
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
#include <Arduino.h>
#include <U8g2lib.h>
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif
#define DHTPIN 15 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
// Uncomment whatever type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino, Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize the DHT sensor.
// Note that older versions of this library took an optional third parameter to
//Tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
// Initialize the OLED display
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,22,21,U8X8_PIN_NONE);
void setup() {
Serial.begin(9600);
Serial.println(F("DHTxx test!"));
dht.begin();
u8g2.begin();
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.println(F("% "));
Serial.print(F("Temperature: "));
Serial.print(t);
Serial.print(F("°C | "));
Serial.print(f);
Serial.println(F("°F"));
Serial.println();
u8g2.clearBuffer();
u8g2.setFont(u8g2_font_ncenB08_tr);
u8g2.setCursor(0, 15);
u8g2.print("Humidity: ");
u8g2.print(h);
u8g2.print("%");
u8g2.setCursor(0, 25);
u8g2.print("Temperature: ");
u8g2.print(t);
u8g2.print("°C");
u8g2.setCursor(0, 35);
u8g2.print("Temperature: ");
u8g2.print(f);
u8g2.print("°F");
u8g2.sendBuffer();
delay(1000);
}
