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| // Example testing sketch for various DHT humidity/temperature sensors | |
| // Written by ladyada, public domain | |
| #include "ESP8266WiFi.h" | |
| #include "DHT.h" | |
| // OLED Library | |
| #include <Wire.h> | |
| #include <Adafruit_GFX.h> | |
| #include <ESP_Adafruit_SSD1306.h> | |
| #define OLED_RESET 4 | |
| Adafruit_SSD1306 display(OLED_RESET); | |
| #define DHTPIN 16 // what pin we're connected to | |
| // Uncomment whatever type you're using! | |
| //#define DHTTYPE DHT11 // DHT 11 | |
| #define DHTTYPE DHT22 // DHT 22 (AM2302) | |
| //#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 DHT sensor for normal 16mhz Arduino | |
| DHT dht(DHTPIN, DHTTYPE,15); | |
| // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you | |
| // might need to increase the threshold for cycle counts considered a 1 or 0. | |
| // You can do this by passing a 3rd parameter for this threshold. It's a bit | |
| // of fiddling to find the right value, but in general the faster the CPU the | |
| // higher the value. The default for a 16mhz AVR is a value of 6. For an | |
| // Arduino Due that runs at 84mhz a value of 30 works. | |
| // Example to initialize DHT sensor for Arduino Due: | |
| //DHT dht(DHTPIN, DHTTYPE, 30); | |
| void setup() { | |
| Serial.begin(9600); | |
| Serial.println("DHTxx test!"); | |
| // dht begin | |
| dht.begin(); | |
| // set display | |
| display.begin(SSD1306_SWITCHCAPVCC, 0x78>>1); | |
| display.display(); | |
| delay(2000); | |
| display.clearDisplay(); | |
| } | |
| void showTemp(float temp,float hud) { | |
| // text display tests | |
| display.setTextSize(2); | |
| display.setTextColor(WHITE); | |
| display.setCursor(0,0); | |
| display.print("T="); | |
| display.print(temp); | |
| display.println("C"); | |
| display.print("H="); | |
| display.print(hud); | |
| display.println("%"); | |
| display.display(); | |
| display.clearDisplay(); | |
| } | |
| void loop() { | |
| // Wait a few seconds between measurements. | |
| delay(1000); | |
| // Reading temperature or humidity takes about 250 milliseconds! | |
| // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) | |
| float h = dht.readHumidity(); | |
| // Read temperature as Celsius | |
| float t = dht.readTemperature(); | |
| // Check if any reads failed and exit early (to try again). | |
| if (isnan(h) || isnan(t)) { | |
| Serial.println("Failed to read from DHT sensor!"); | |
| return; | |
| } | |
| // show in serial monitor | |
| Serial.print("Humidity: "); | |
| Serial.print(h); | |
| Serial.print(" %\t"); | |
| Serial.print("Temperature: "); | |
| Serial.print(t); | |
| Serial.print(" *C \n"); | |
| // show temp | |
| showTemp(t,h); | |
| } |
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