Wemos OLED temperature project

This example will take the previous Wemos OLED shield example and make something slightly more useful with it. In this case we used a DHT11 shield and are going to display the temperature and humidity on the display.

Setup

This was a picture of my initial setup with the temperature and humidity displayed, as you can see the OLED shield is the top board, under is the DHT11 shield and at the bottom is the Wemos mini

Code

Basically for a project like this you are taking a DHT11 example and merging with an OLED example

It requires the Adafruit library for the OLED display from https://github.com/mcauser/Adafruit_SSD1306 library and https://github.com/adafruit/DHT-sensor-library

[codesyntax lang=”cpp”]

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"


#define OLED_RESET 0  // GPIO0
Adafruit_SSD1306 display(OLED_RESET);

#define DHTPIN D4
#define DHTTYPE DHT11  
DHT dht(DHTPIN, DHTTYPE);

void setup()   
{
  Serial.begin(9600);
  dht.begin();
  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)
  display.display();
}


void loop() 
{
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  // 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();
  float t = dht.readTemperature();
  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("Failed to read from DHT sensor!");
    return;
  }
  //temp in c
  display.println("temp");
  display.print(t);
  display.println(" c");
  display.println("humidity");
  display.print(h);
  display.println(" %");
  display.display();
  
}

[/codesyntax]

Links
 
D1 Mini WeMos DHT11 Single Bus Digital Temperature Humidity Sensor Shield Module