ESP8266 based weather station. It request from the OpenWeather API and getting data from there. Also DHT11 sensor measures room temperature and humidity. All data is shown on 2x16 LCD screen and stored in microSD card.
Equipments:
- WeMos D1 R1
- 2x16 LCD Screen with LCD I2C Serial Interface Module
- DHT11 Temperature and Humidity Module (built-in 10k pull-up resistor)
- DS3231 Precision RTC Module
- MicroSD Card Module
- Breadboard
- Jumper Wires
Schematic:
Images
Code
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <ESPWiFi.h>
#include <ESPHTTPClient.h>
#include <JsonListener.h>
#include <ESP8266WiFi.h>
#include <ArduinoJson.h>
#include <DS3231.h>
#include <SPI.h>
#include "SdFat.h"
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display
#define DHTPIN D1
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
const char* ssid = "ALPEREN"; // SSID of local network
const char* password = "xxxxxxxxxxxx"; // Password on network
String apiKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; // from openweathermap.org
String cityID = "323786";
/*
İstanbul - 745042
İzmir - 311046
Ankara - 323786
*/
WiFiClient client;
char servername[] = "api.openweathermap.org";
String result;
int counter = 60;
String weatherDescription = "";
String weatherLocation = "";
String Country;
float Temperature;
float Humidity;
float Pressure;
float DHT_Humidity;
float DHT_Celcius;
int DayValue;
RTClib myRTC;
DS3231 Clock;
using namespace sdfat;
SdFat SD;
#define SD_CS_PIN SS
void setup()
{
Serial.begin(57600);
Wire.begin();
delay(500);
lcd.init();
lcd.backlight();
int cursorPosition = 0;
lcd.begin(16, 2);
lcd.print(" Connecting");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
lcd.setCursor(cursorPosition, 1);
lcd.print(".");
cursorPosition++;
}
lcd.clear();
lcd.print(" Connected!");
delay(1000);
lcd.clear();
}
void loop()
{
dht.begin();
//Site verileri
if (counter == 60)
{
getWeatherData();
counter = 0;
delay(2000);
displayWeather(weatherLocation, weatherDescription, counter);
delay(5000);
displayConditions(Temperature, Humidity, Pressure);
delay(5000);
}
else
{
counter++;
displayWeather(weatherLocation, weatherDescription, counter);
delay(5000);
displayConditions(Temperature, Humidity, Pressure);
delay(5000);
}
lcd.clear();
getDhtData();
lcd.clear();
//RTC Saat
int i = 0;
while (i < 5) {
rtcPage();
i++;
}
lcd.clear();
logToSD(Temperature, Humidity, Pressure, weatherLocation, weatherDescription, Country, DHT_Humidity, DHT_Celcius,DayValue);
}
void getWeatherData()
{
lcd.setCursor(0, 0);
lcd.print("Data");
lcd.setCursor(0, 1);
lcd.print("Updating");
if (client.connect(servername, 80)) { //starts client connection, checks for connection
client.println("GET /data/2.5/weather?id=" + cityID + "&units=metric&APPID=" + apiKey);
client.println("Host: api.openweathermap.org");
client.println("User-Agent: ArduinoWiFi/1.1");
client.println("Connection: close");
client.println();
}
else {
Serial.println("connection failed"); //error message if no client connect
Serial.println();
}
while (client.connected() && !client.available()) delay(1); //waits for data
while (client.connected() || client.available()) { //connected or data available
char c = client.read(); //gets byte from ethernet buffer
result = result + c;
}
client.stop(); //stop client
result.replace('[', ' ');
result.replace(']', ' ');
Serial.println(result);
char jsonArray [result.length() + 1];
result.toCharArray(jsonArray, sizeof(jsonArray));
jsonArray[result.length() + 1] = '\0';
StaticJsonBuffer<1024> json_buf;
JsonObject &root = json_buf.parseObject(jsonArray);
if (!root.success())
{
Serial.println("parseObject() failed");
}
String location = root["name"];
String country = root["sys"]["country"];
float temperature = root["main"]["temp"];
float humidity = root["main"]["humidity"];
String weather = root["weather"]["main"];
String description = root["weather"]["description"];
float pressure = root["main"]["pressure"];
weatherDescription = description;
weatherLocation = location;
Country = country;
Temperature = temperature;
Humidity = humidity;
Pressure = pressure;
}
void getDhtData()
{
float dht_humidity = dht.readHumidity();
float dht_celsius = dht.readTemperature();
lcd.setCursor(2, 0);
lcd.print("Temp");
lcd.setCursor(1, 1);
lcd.print(dht_celsius);
lcd.print((char)223);
lcd.print("C");
lcd.setCursor(11, 0);
lcd.print("Hum");
lcd.setCursor(10, 1);
lcd.print(dht_humidity);
DHT_Humidity = dht_humidity;
DHT_Celcius = dht_celsius;
delay(5000);
}
void displayWeather(String location, String description, int counter)
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(location);
lcd.print(", ");
lcd.print(Country);
lcd.setCursor(0, 1);
lcd.print(description);
lcd.setCursor(14, 1);
lcd.print(counter);
}
void displayConditions(float Temperature, float Humidity, float Pressure)
{
lcd.clear();
lcd.print(" T:");
lcd.print(Temperature, 1);
lcd.print((char)223);
lcd.print("C ");
lcd.print(" H:");
lcd.print(Humidity, 0);
lcd.print("%");
lcd.setCursor(0, 1);
lcd.print(" P:");
lcd.print(Pressure, 1);
lcd.print(" hPa");
}
void rtcPage()
{
DateTime now = myRTC.now();
char daysOfTheWeek[7][4] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
int dayValue = Clock.getDoW();
String dayofweek = daysOfTheWeek[dayValue];
lcd.setCursor(1, 0);
if (now.day() < 10)
{
lcd.print("0");
lcd.print(now.day(), DEC);
}
else
{
lcd.print(now.day(), DEC);
}
lcd.print('/');
if (now.month() < 10)
{
lcd.print("0");
lcd.print(now.month(), DEC);
}
else
{
lcd.print(now.month(), DEC);
}
lcd.print('/');
lcd.print(now.year(), DEC);
lcd.print(' ');
lcd.print(dayofweek);
lcd.setCursor(4, 1);
if (now.hour() < 10)
{
lcd.print("0");
lcd.print(now.hour(), DEC);
}
else
{
lcd.print(now.hour(), DEC);
}
lcd.print(':');
if (now.minute() < 10)
{
lcd.print("0");
lcd.print(now.minute(), DEC);
}
else
{
lcd.print(now.minute(), DEC);
}
lcd.print(':');
if (now.second() < 10)
{
lcd.print("0");
lcd.print(now.second(), DEC);
}
else
{
lcd.print(now.second(), DEC);
}
DayValue = dayValue;
delay(1000);
}
void logToSD(float Temperature, float Humidity, float Pressure, String weatherLocation, String weatherDescription, String Country, float dht_humidity, float dht_celsius, int DayValue)
{
lcd.setCursor(5, 0);
lcd.print("Saving");
delay(1000);
sdfat::File myFile;
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
if (!SD.begin(SD_CS_PIN)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("weather8.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to weather8.txt...");
DateTime nowx = myRTC.now();
char fullDayNames[7][10] = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
String fullName = fullDayNames[DayValue];
myFile.print("[");
myFile.print(nowx.day());
myFile.print("/");
myFile.print(nowx.month());
myFile.print("/");
myFile.print(nowx.year());
myFile.print(" ");
myFile.print(fullName);
myFile.print(" ");
myFile.print(nowx.hour());
myFile.print(":");
myFile.print(nowx.minute());
myFile.print(":");
myFile.print(nowx.second());
myFile.println("]");
myFile.println("");
myFile.print("[");
myFile.print("API");
myFile.println("]");
myFile.print(Country);
myFile.print(" ");
myFile.print(weatherLocation);
myFile.print(" - ");
myFile.println(weatherDescription);
myFile.print("Temperature:");
myFile.print(Temperature, 1);
myFile.print((char)176);
myFile.print("C ");
myFile.print(" Humidity:");
myFile.print(Humidity, 0);
myFile.print("%");
myFile.print(" Pressure:");
myFile.print(Pressure, 1);
myFile.println(" hPa");
myFile.println("");
myFile.print("[");
myFile.print("DHT");
myFile.println("]");
myFile.print("DHT Temperature:");
myFile.print(dht_celsius);
myFile.print((char)176);
myFile.print("C");
myFile.print(" DHT Humidity:");
myFile.print("%");
myFile.println(dht_humidity);
myFile.println("------------------------------------------------------");
// close the file:
myFile.close();
Serial.println("done.");
}
else {
// if the file didn't open, print an error:
Serial.println("error opening weather8.txt");
}
// re-open the file for reading:
myFile = SD.open("weather8.txt");
if (myFile) {
Serial.println("weather8.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
}
else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
lcd.clear();
}