使用 Wio Terminal 读取冠状病毒 COVID-19 实时数据
本教程是对从 Wio Terminal 读取 Github 仓库统计信息的修改版本，修改后可以访问冠状病毒 COVID19 API并解析数据，在 LCD 屏幕上显示实时 COVID-19 数据。
零件清单
功能特性
-
连接到 https 服务器
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获取 COVID-19 实时数据 API
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按下按钮刷新数据
所需的 Arduino 库
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安装 LCD 屏幕库
Seeed_Arduino_LCD，请访问 Wio Terminal LCD 获取更多信息。 -
访问 ArduinoJson 仓库并将整个仓库下载到本地驱动器。
- 现在，可以将 ArduinoJson 库安装到 Arduino IDE 中。打开 Arduino IDE，点击
sketch->Include Library->Add .ZIP Library，然后选择刚刚下载的ArduinoJson文件。
- 现在，可以将 ArduinoJson 库安装到 Arduino IDE 中。打开 Arduino IDE，点击
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有关 Https 连接的更多信息，请访问这里。
Arduino 说明
-
下载
Free_Fonts.h头文件，以便可以使用 LCD 库中包含的免费字体的缩写。请确保将此头文件放在与 Arduino 草图相同的位置。 -
在这里下载完整代码或复制以下内容。
-
上传代码。
完整代码
注意： 将 ssid 和 password 更改为您的网络 Wi-Fi。
#include "rpcWiFi.h"
#include <WiFiClientSecure.h>
#include <ArduinoJson.h>
#include"Free_Fonts.h"
#include"TFT_eSPI.h"
TFT_eSPI tft;
const char* ssid = "YourNetworkName";
const char* password = "yourNetworkPassword";
const char* server = "api.covid19api.com"; // 服务器 URL
const char* test_root_ca = \
"-----BEGIN CERTIFICATE-----\n"
"MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/\n"
"MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT\n"
"DkRTVCBSb290IENBIFgzMB4XDTE2MDMxNzE2NDA0NloXDTIxMDMxNzE2NDA0Nlow\n"
"SjELMAkGA1UEBhMCVVMxFjAUBgNVBAoTDUxldCdzIEVuY3J5cHQxIzAhBgNVBAMT\n"
"GkxldCdzIEVuY3J5cHQgQXV0aG9yaXR5IFgzMIIBIjANBgkqhkiG9w0BAQEFAAOC\n"
"AQ8AMIIBCgKCAQEAnNMM8FrlLke3cl03g7NoYzDq1zUmGSXhvb418XCSL7e4S0EF\n"
"q6meNQhY7LEqxGiHC6PjdeTm86dicbp5gWAf15Gan/PQeGdxyGkOlZHP/uaZ6WA8\n"
"SMx+yk13EiSdRxta67nsHjcAHJyse6cF6s5K671B5TaYucv9bTyWaN8jKkKQDIZ0\n"
"Z8h/pZq4UmEUEz9l6YKHy9v6Dlb2honzhT+Xhq+w3Brvaw2VFn3EK6BlspkENnWA\n"
"a6xK8xuQSXgvopZPKiAlKQTGdMDQMc2PMTiVFrqoM7hD8bEfwzB/onkxEz0tNvjj\n"
"/PIzark5McWvxI0NHWQWM6r6hCm21AvA2H3DkwIDAQABo4IBfTCCAXkwEgYDVR0T\n"
"AQH/BAgwBgEB/wIBADAOBgNVHQ8BAf8EBAMCAYYwfwYIKwYBBQUHAQEEczBxMDIG\n"
"CCsGAQUFBzABhiZodHRwOi8vaXNyZy50cnVzdGlkLm9jc3AuaWRlbnRydXN0LmNv\n"
"bTA7BggrBgEFBQcwAoYvaHR0cDovL2FwcHMuaWRlbnRydXN0LmNvbS9yb290cy9k\n"
"c3Ryb290Y2F4My5wN2MwHwYDVR0jBBgwFoAUxKexpHsscfrb4UuQdf/EFWCFiRAw\n"
"VAYDVR0gBE0wSzAIBgZngQwBAgEwPwYLKwYBBAGC3xMBAQEwMDAuBggrBgEFBQcC\n"
"ARYiaHR0cDovL2Nwcy5yb290LXgxLmxldHNlbmNyeXB0Lm9yZzA8BgNVHR8ENTAz\n"
"MDGgL6AthitodHRwOi8vY3JsLmlkZW50cnVzdC5jb20vRFNUUk9PVENBWDNDUkwu\n"
"Y3JsMB0GA1UdDgQWBBSoSmpjBH3duubRObemRWXv86jsoTANBgkqhkiG9w0BAQsF\n"
"AAOCAQEA3TPXEfNjWDjdGBX7CVW+dla5cEilaUcne8IkCJLxWh9KEik3JHRRHGJo\n"
"uM2VcGfl96S8TihRzZvoroed6ti6WqEBmtzw3Wodatg+VyOeph4EYpr/1wXKtx8/\n"
"wApIvJSwtmVi4MFU5aMqrSDE6ea73Mj2tcMyo5jMd6jmeWUHK8so/joWUoHOUgwu\n"
"X4Po1QYz+3dszkDqMp4fklxBwXRsW10KXzPMTZ+sOPAveyxindmjkW8lGy+QsRlG\n"
"PfZ+G6Z6h7mjem0Y+iWlkYcV4PIWL1iwBi8saCbGS5jN2p8M+X+Q7UNKEkROb3N6\n"
"KOqkqm57TH2H3eDJAkSnh6/DNFu0Qg==\n"
"-----END CERTIFICATE-----\n";
// 如果需要，您可以使用 x.509 客户端证书
//const char* test_client_key = ""; //用于验证客户端
//const char* test_client_cert = ""; //用于验证客户端
String data;
WiFiClientSecure client;
void setup() {
//初始化串口并等待端口打开：
Serial.begin(115200);
delay(100);
pinMode(WIO_KEY_C, INPUT_PULLUP);
Serial.print("尝试连接到 SSID: ");
Serial.println(ssid);
WiFi.begin(ssid, password);
tft.begin();
tft.setRotation(3);
tft.fillScreen(TFT_BLACK);
tft.setFreeFont(FMB12);
tft.setCursor((320 - tft.textWidth("正在连接 Wi-Fi.."))/2, 120);
tft.print("正在连接 Wi-Fi..");
// 尝试连接到 Wifi 网络：
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
// 等待 1 秒后重试
delay(1000);
}
Serial.print("已连接到 ");
Serial.println(ssid);
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("已连接!"))/2, 120);
tft.print("已连接!");
getData();
}
int lastState = 1;
void loop()
{
int currentState = digitalRead(WIO_KEY_C);
if (currentState == 0) {
if (currentState != lastState) {
getData();
}
lastState = !lastState;
}
}
void getData() {
client.setCACert(test_root_ca);
//client.setCertificate(test_client_key); // 用于客户端验证
//client.setPrivateKey(test_client_cert); // 用于客户端验证
tft.fillScreen(TFT_BLACK);
tft.setTextColor(TFT_WHITE);
tft.setCursor((320 - tft.textWidth("正在连接服务器.."))/2, 120);
tft.print("正在连接服务器..");
Serial.println("\n开始连接到服务器...");
if (!client.connect(server, 443)) {
Serial.println("连接失败!");
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("连接失败!"))/2, 120);
tft.print("连接失败!");
} else {
Serial.println("已连接到服务器!");
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("已连接到服务器!"))/2, 120);
tft.print("已连接到服务器!");
// 发出 HTTP 请求：
client.println("GET https://api.covid19api.com/world/total HTTP/1.0");
client.println("Host: api.covid19api.com");
client.println("Connection: close");
client.println();
while (client.connected()) {
String line = client.readStringUntil('\n');
if (line == "\r") {
Serial.println("已接收头部信息");
break;
}
}
while(client.available())
{
String line = client.readStringUntil('\r');
data = line;
}
Serial.println(data);
client.stop();
Serial.println("关闭连接");
}
//使用 ArduinoJson 解析数据，更多信息请查看 ArduinoJson
const size_t capacity = JSON_OBJECT_SIZE(3) + 50;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, data);
long TotalConfirmed = doc["TotalConfirmed"];
long TotalDeaths = doc["TotalDeaths"];
long TotalRecovered = doc["TotalRecovered"];
// -----------------LCD---------------------
tft.fillScreen(tft.color565(24,15,60));
tft.setFreeFont(FF17);
tft.setTextColor(tft.color565(224,225,232));
tft.drawString("COVID-19 仪表板/全球",20,10);
tft.fillRoundRect(10, 45, 300, 55, 5, tft.color565(40,40,86));
tft.fillRoundRect(10, 105, 300, 55, 5, tft.color565(40,40,86));
tft.fillRoundRect(10, 165, 300, 55, 5, tft.color565(40,40,86));
tft.setFreeFont(FM9);
tft.drawString("总确诊数", 75, 50);
tft.drawString("总死亡数",95, 110);
tft.drawString("总康复数",75, 170);
tft.setFreeFont(FMB12);
tft.setTextColor(TFT_RED);
tft.drawNumber(TotalConfirmed, 110, 75);
tft.setTextColor(tft.color565(224,225,232));
tft.drawNumber(TotalDeaths, 120, 135);
tft.setTextColor(TFT_GREEN);
tft.drawNumber(TotalRecovered, 110, 195);
}