UNO R4 WiFi Weather Dashboard

1/* -------------------- WeatherAPI.com fetch -------------------- */
2void fetchWeather() {
3    if (!client.connect(host, 80)) {
4        Serial.println("HTTP connect failed");
5        return;
6    }
7
8    String url = "/v1/current.json?key=" + apiKey + "&q=" + city + "&aqi=no";
9    client.println("GET " + url + " HTTP/1.1");
10    client.println("Host: " + String(host));
11    client.println("Connection: close");
12    client.println();
13
14    String payload;
15    while (client.connected() || client.available()) {
16        if (client.available()) {
17            payload += client.readStringUntil('\n');
18        }
19    }
20    client.stop();
21
22    // BREAKPOINT: inspect payload
23    // Watch: payload
24
25    int jsonStart = payload.indexOf('{');
26    if (jsonStart < 0) {
27        Serial.println("No JSON found.");
28        return;
29    }
30
31    DynamicJsonDocument doc(2048);
32    DeserializationError err = deserializeJson(doc, payload.substring(jsonStart));
33    if (err) {
34        Serial.print("JSON parse error: ");
35        Serial.println(err.c_str());
36        return;
37    }
38
39    tempC = doc["current"]["temp_c"].as<float>();
40    conditionText = doc["current"]["condition"]["text"].as<String>();
41    weatherText = "T:" + String(tempC, 1) + "C " + conditionText + "  ";
42
43    // TRACEPOINT: Weather updated: {tempC}C
44    // Watch: tempC, conditionText, weatherText
45
46    Serial.println(weatherText.c_str());
47
48    
49}

1/* -------------------- LED Matrix Text Draw -------------------- */
2void showScrolling(const String& s) {
3    matrix.beginDraw();
4    matrix.textFont(Font_5x7);
5    matrix.textScrollSpeed(75);           // ms per pixel
6    matrix.beginText(0, 1, 0xFFFFFF);
7    matrix.print(" ");
8    matrix.print(s);
9    matrix.print(" ");
10    matrix.endText(SCROLL_LEFT);
11    matrix.endDraw();
12}

1#pragma once
2// Add the API Key from WeatherAPI.com
3#define API_KEY "xxxxxxxxxxxxxxxxxxxxxxx"
4// Add the Credentials for your WiFi Network
5#define WIFI_SSID "xxxxxxxx"
6#define WIFI_PASS "xxxxxxxx"

1/*
2  UNO R4 WiFi - Weather Dashboard (WeatherAPI.com)
3  Scrolls temperature + condition on the 12x8 LED matrix.
4
5  Included in this Solution:-
6      Board Package:
7        Arduino Renesas UNO R4 Boards v 1.5.1
8
9      External Libraries Included in this Solution:
10        ArduinoGraphics v1.1.4
11        ArduinoJson v7.4.2
12
13Debug Options (No Additional Hardware Needed!):-
14    Serial Debugger (+Plot Charts)
15    Hardware Debugger
16*/
17
18#include <ArduinoJson.hpp>
19#include "ArduinoGraphics.h"
20#include "Arduino_LED_Matrix.h"
21#include <WiFiS3.h>
22#include <ArduinoJson.h>
23#include "Secrets.h"
24
25ArduinoLEDMatrix matrix;
26
27const char* ssid = WIFI_SSID;
28const char* pass = WIFI_PASS;
29
30// WeatherAPI endpoint (free tier)
31const char* host = "api.weatherapi.com";
32String apiKey = API_KEY;
33String city = "Birmingham";
34
35// Data fields
36String weatherText = "Starting... ";
37float  tempC = 0.0;
38String conditionText;
39
40unsigned long lastFetch = 0;
41const unsigned long FETCH_INTERVAL_MS = 5UL * 60UL * 1000UL; // 5 min
42
43WiFiClient client;
44
45void setup() {
46    Serial.begin(115200);
47    matrix.begin();
48
49#if VM_DEBUG_GDB
50    delay(5000); // Allow GDB to attach if in Debug Mode
51#endif
52
53    Serial.print("Connecting to Wi-Fi");
54    WiFi.begin(ssid, pass);
55
56    while (WiFi.status() != WL_CONNECTED) {
57        Serial.print(".");
58        delay(500);
59    }
60    Serial.println("\nConnected!");
61    showScrolling("Wi-Fi OK ");
62
63    fetchWeather();  // initial
64}
65
66void loop() {
67    if (millis() - lastFetch >= FETCH_INTERVAL_MS) {
68        fetchWeather();
69    }
70    else {
71        // Just keep showing the last information we received repeatedly
72        showScrolling(weatherText);
73        lastFetch = millis();
74    }
75    delay(1000);
76}