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main.cpp
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main.cpp
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/* Original Code written by: Johann Brochier
* Meteo en direct via l'API d'Open Weather Map sur WIFI KIT 32 de Heltec
* Auteur : Johann Brochier
*
* Open Weather Map API data for Heltec WiFi Kit V2
* This revised version created March 2023 by GC_Marvin
* Heltec WiFi Kit 32 / 115200
*/
#include <Arduino.h>
#include <ArduinoJson.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include "images.h"
#include "heltec.h"
void displayIcon(String sky); //declare function
void signalBars (); //declare function
const char* ssid = "your_ssid"; // SSID Wifi <<<< EDIT <<<<
const char* password = "your_ssid_password"; // SSID WiFi Password <<<< EDIT <<<<
String town = "your_town_city"; // EDIT <<<< your city/town/location name
String Country = "your_country_code"; // EDIT <<<< your country code
const String endpoint = "https://api.openweathermap.org/data/2.5/weather?q="+town+","+Country+"&units=metric&APPID="; // URL OWM API
const String key = "your_OWM_API_Key"; // OWM API Key <<<< EDIT <<<< your Open Weather Map API Key
void WiFiEvent(WiFiEvent_t event, system_event_info_t info){
switch(event){
case SYSTEM_EVENT_STA_START:
Serial.println("Mode station");
break;
case SYSTEM_EVENT_STA_GOT_IP:
Serial.println("Connected to :" + String(WiFi.SSID()));
Serial.print("IP: ");
Serial.println(WiFi.localIP());
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
Serial.println("Disconnected, waiting to reconnect");
WiFi.reconnect();
break;
default:
break;
}
}
void wifiConnect() {
Serial.println("void wifi connect begin");
WiFi.begin(ssid, password);
byte count = 0;
while (WiFi.status() != WL_CONNECTED && count < 10) {
delay(500);
count++;
Heltec.display->setBrightness(50); //screen brightness level - 0 is really dim but visible, 255 is max bright
Heltec.display -> drawString(2, 5, "Wi-Fi connecting...");
Heltec.display -> display();
}
Heltec.display -> clear();
if(WiFi.status() == WL_CONNECTED)
{
Heltec.display -> drawString(2, 5, "Wifi ... OK");
Heltec.display -> drawString(2, 20, "connected to ssid:");
Heltec.display -> drawString(2, 33, ssid);
Heltec.display -> drawString(2, 53, WiFi.macAddress()); // mac address shown - might need to know it for another project
Heltec.display -> display();
Serial.println("wifi connected");
} else {
Heltec.display -> clear();
Heltec.display -> drawString(2, 5, "Wifi connection ... Error");
Heltec.display -> display();
Serial.println("wifi error");
//while(1);
}
delay(1000); //displays for one second
Heltec.display -> clear();
}
void displayWeather(String payload){
Heltec.display -> clear(); // clear the display
StaticJsonDocument<2048> doc;
auto error = deserializeJson(doc, payload); // start parsing JSON
if (error) {
Serial.print(F("deserializeJson() Error code : "));
Serial.println(error.c_str());
return;
} else {
const char* location = doc["name"]; // automatically inserts the"name" of city/town from data
Heltec.display->setBrightness(50); //screen brightness level - 0 is really dim but visible, 255 is max bright
Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT);
Heltec.display->setFont(ArialMT_Plain_16);
Heltec.display -> drawString(0, 0, location);
//Heltec.display -> setFont(ArialMT_Plain_10); // comment out lines 88+89
//Heltec.display -> drawString(0, 0, ("YOURCITY")); // added this line here so I could make "location" all caps small font (does not auto instert location)
Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT);
Heltec.display->setFont(ArialMT_Plain_10);
JsonObject data = doc["main"]; // temperature data
JsonObject weather = doc["weather"][0]; // required for weather icons
JsonObject wind = doc["wind"]; // for wind data
JsonObject clouds = doc["clouds"]; // for cloud cover data
String sky = weather["icon"];
String desc = weather["description"];
String cloud = weather["main"];
float temperature = data["temp"]; //I used float data for more accurate integer - rounds up or down with no decimal place
float feels = data["feels_like"];
//float lotemp = data["temp_min"];
//float hitemp = data["temp_max"];
int pressure = data["pressure"];
int humidity = data["humidity"];
float windspeed = wind["speed"];
float windgust = wind["gust"];
int cloudcover = clouds["all"];
float vsblty = doc["visibility"];
Heltec.display -> drawString(0, 18, "Cc:" + String(cloudcover) + "%");
Heltec.display -> drawString(40, 18, String(cloud));
Heltec.display -> drawString(0, 27, "> " + String(desc));
//Heltec.display -> drawString(0, 18, "wchill: " + String(feels,0) + "°c"); // '0' = no decimal - windchill or realfeel or feelslike
//Heltec.display -> drawString(0, 27, "Hi: " + String (hitemp,0) + "°c"); // forecast high temp - hourly
//Heltec.display -> drawString(44, 27, "Lo: " + String (lotemp,0) + "°c"); //forecast low temp - hourly
Heltec.display -> drawString(0, 36, "RHumi: " + (String)humidity + "%"); // relative humidity
Heltec.display -> drawString(0, 45, "BPress: " + (String)pressure + " hPa"); //barometric pressure
Heltec.display -> drawString(0, 54, "Wnd: " + String(windspeed*3.6,0)); //convert m/s to km/h *3.6 - '0' with no decimal
Heltec.display -> drawString(44, 54, "Gst: " + String(windgust*3.6,0) + " km/h"); //convert m/s to km/h *3.6 - '0' with no decimal
Heltec.display -> drawHorizontalLine(100,18,28); // col,row,width - horizontal line under current temp
Heltec.display -> drawHorizontalLine(107,20,14); //col,row,width - horizontal line
Heltec.display -> drawHorizontalLine(100,22,28); // col,row,width - horizontal line above feels like temp
Heltec.display -> drawString(123, 28,"®"); // put this ® here to indicate real feel temp - it looks like a C with an R in it :)
Heltec.display -> drawString(122, 5,"C"); // making more space with 'C' in smaller font
Heltec.display -> setTextAlignment(TEXT_ALIGN_RIGHT);
Heltec.display -> drawString(128, 37, "vis:" + String(vsblty *.001,1)+ "km");//*.001 convert m to km
Heltec.display -> setFont(ArialMT_Plain_16);
Heltec.display -> drawString(129, 0, String(temperature,0) + "°"); //'0'= no decimal - this places current temp to right of location(town/city)in large font
Heltec.display -> drawString(129, 23, String(feels,0) + "°"); // windchill or realfeel or feelslike - moved this up here for better visibility
//Heltec.display -> setTextAlignment(TEXT_ALIGN_LEFT); //Moves wxDescription under small place name in larger font
//Heltec.display -> setFont(ArialMT_Plain_16);
//Heltec.display -> drawString(0, 12, String(desc));
displayIcon(sky); // call function weather icon
signalBars(); // call function wifi signal quality
Heltec.display -> display();
}
}
void displayIcon(String sky) { // cloud conditions icon
String sk = sky.substring(0,2);
const char* icon;
switch (sk.toInt()) {
case 1:
icon = one_bits;
break;
case 2:
icon = two_bits;
break;
case 3:
icon = three_bits;
break;
case 4:
icon = four_bits;
break;
case 9:
icon = nine_bits;
break;
case 10:
icon = ten_bits;
break;
case 11:
icon = eleven_bits;
break;
case 13:
icon = thirteen_bits;
break;
case 50:
icon = fifty_bits;
break;
default:
icon = nothing_bits; // no icon found
break;
}
Heltec.display -> drawXbm(65,0,30,30,(const unsigned char *)icon);
// Do not make size larger than 32x32 or it won't work as original was 30x30
// Weather Icon - 100,15,32,32 (leftline,topline,width,height)
//Heltec.display -> drawXbm(80,15,30,30,(const unsigned char *)icon);
}
void signalBars () { // wifi signal strength bars - I altered these paramaters, as they were showing no bars but it was still able to receive data.
long rssi = WiFi.RSSI();
int bars;
if (rssi > -55) {
bars = 5;
} else if (rssi < -55 & rssi > -65) {
bars = 4;
} else if (rssi < -70 & rssi > -80) {
bars = 3;
} else if (rssi < -80 & rssi > -90) {
bars = 2;
} else if (rssi < -90 & rssi > -100) {
bars = 1;
} else {
bars = 0;
}
for (int b=0; b <= bars; b++) {
Heltec.display->drawRect(110,50,18,14); // draw rectangle around the signal strength bars ~ (leftline,topline,width,height)
Heltec.display->fillRect(109 + (b*3),62 - (b*2),2,b*2);
//Heltec.display->fillRect(110 + (b*3),50 - (b*2),2,b*2);
}
}
void setup() {
Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Enable*/, true /*Serial Enable*/); // Activation of the OLED screen and the serial link
Heltec.display->setBrightness(0);
Heltec.display->clear();
analogSetClockDiv(255); // 1338mS
Serial.begin(115200);
delay(50); //<<<<<
wifiConnect();
}
void loop() {
bool errorHttp = false;
if ((WiFi.status() == WL_CONNECTED)) { // Wifi status check
HTTPClient http;
Serial.println("voidloop http begin");
http.begin(endpoint + key); // URL vers l'API
int httpCode = http.GET();
if (httpCode > 0) { // Checking the returned HTTP code
String payload = http.getString();
Serial.println("Code http : " + (String)httpCode);
Serial.println(payload);
displayWeather(payload);
Serial.println("Done . . . next weather update in 30 min");
http.end(); // release of resources
Serial.println("END HTTP 1");
delay (1800000); // / This delay is set to update weather imformation every 1,800,000 Milliseconds (30 Minutes) //900,000 = (15 min) //1,200,000 = (20 min)
} else {
Heltec.display -> clear();
Heltec.display -> setBrightness(50); //screen brightness level - 0 is really dim but visible, 255 is max bright
Heltec.display -> setTextAlignment(TEXT_ALIGN_CENTER);
Heltec.display -> setFont(ArialMT_Plain_10);
Heltec.display -> drawString(64,4,"Reconnecting");
Heltec.display -> drawString(64,20,"to weather service");
Heltec.display -> drawString(64,36,"Wait ...");
Heltec.display -> display();
Serial.println("Request Error HTTP");
errorHttp = true;
delay (5000);
Serial.println("END HTTP 2");
http.end(); // release of resources
}
}
}