Wio Terminal 抓取 GitHub 数据
Demo 概述
这个 Demo 展示了如何使用 Wio Terminal 从网络抓取 GitHub 仓库的统计数据，并显示到 LCD 屏幕上。学会这个技能，意味着你可以使用 Wio Terminal 从互联网上抓取实时数据，比如新闻、天气信息、B 站统计数据等等。不过，如今许多 Web 服务器都是 HTTPS 的，所以还是有点技术难度的！
重点难点
- 连接 HTTPS 服务器
- 抓取 GitHub 仓库统计数据
- 支持切换任意 Github 仓库
安装依赖库
本示例 Demo 依赖 LCD 库、ArduinoJson 库和 Free_Fonts.h 字体库：
LCD库在安装 Seeed SAMD Boards 库时已经包含了，大家可以参考 Wio Terminal 开发环境。ArduinoJson库可以在 GitHub 仓库下载，在 Arduino IDE 点击 项目 > 加载库 > 添加 .ZIP 库… 即可添加库。Free_Fonts.h库提供了一些免费字体，可以点击这里下载，并将它放在 Arduino 工程中。
关于 HTTP 和 HTTPS 连接，请参考 Wio Terminal HTTP 连接。
完整代码
提示：将下面代码中的 ssid 和 password 替换成你的 WiFi 网络。
#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";
//29*27
const unsigned char watchIMG[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00,
0x00, 0xFC, 0x07, 0x00, 0x00, 0xFF, 0x1F, 0x00, 0x80, 0x1F, 0x3F, 0x00,
0xC0, 0x07, 0x7C, 0x00, 0xE0, 0x03, 0xF8, 0x00, 0xF0, 0xE1, 0xF0, 0x01,
0xF8, 0xF1, 0xF1, 0x01, 0xF8, 0xF8, 0xF1, 0x03, 0xFC, 0xF8, 0xF1, 0x03,
0xF8, 0xF0, 0xF1, 0x03, 0xF0, 0xF1, 0xF0, 0x01, 0xF0, 0x01, 0xF8, 0x00,
0xE0, 0x03, 0x78, 0x00, 0xC0, 0x07, 0x3E, 0x00, 0x80, 0xFF, 0x1F, 0x00,
0x00, 0xFE, 0x0F, 0x00, 0x00, 0xF8, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char starIMG[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00,
0x00, 0xC0, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0xE0, 0x01, 0x00,
0x00, 0xF0, 0x01, 0x00, 0x00, 0xF0, 0x03, 0x00, 0x00, 0xF8, 0x03, 0x00,
0x00, 0xF8, 0x07, 0x00, 0x00, 0xFE, 0x0F, 0x00, 0xFE, 0xFF, 0xFF, 0x1F,
0xFE, 0xFF, 0xFF, 0x0F, 0xFC, 0xFF, 0xFF, 0x07, 0xF8, 0xFF, 0xFF, 0x03,
0xF0, 0xFF, 0xFF, 0x01, 0xC0, 0xFF, 0xFF, 0x00, 0x80, 0xFF, 0x7F, 0x00,
0x00, 0xFF, 0x3F, 0x00, 0x80, 0xFF, 0x3F, 0x00, 0x80, 0xFF, 0x3F, 0x00,
0x80, 0xFF, 0x3F, 0x00, 0x80, 0xFF, 0x7F, 0x00, 0x80, 0xBF, 0x7F, 0x00,
0xC0, 0x1F, 0x7E, 0x00, 0xC0, 0x07, 0x78, 0x00, 0xC0, 0x01, 0x70, 0x00,
0x40, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const unsigned char forkIMG[] = {
0xF8, 0x00, 0x00, 0x00, 0xFE, 0x03, 0x00, 0x00, 0x0F, 0x07, 0x00, 0x01,
0x07, 0x07, 0xE0, 0x0F, 0x07, 0x07, 0x78, 0x1E, 0x9E, 0x07, 0x38, 0x38,
0xFC, 0x01, 0x38, 0x38, 0xF8, 0x00, 0x38, 0x3C, 0xF8, 0x00, 0xF0, 0x1F,
0xF8, 0x00, 0xE0, 0x07, 0xF8, 0x00, 0xC0, 0x07, 0xF8, 0x00, 0xE0, 0x07,
0xF8, 0x00, 0xE0, 0x07, 0xF8, 0x00, 0xF8, 0x03, 0xF8, 0x00, 0xFE, 0x01,
0xF8, 0xE0, 0xFF, 0x00, 0xF8, 0xFF, 0x7F, 0x00, 0xF8, 0xFF, 0x1F, 0x00,
0xF8, 0xFF, 0x03, 0x00, 0xF8, 0x1F, 0x00, 0x00, 0xF8, 0x03, 0x00, 0x00,
0xF8, 0x01, 0x00, 0x00, 0xF8, 0x00, 0x00, 0x00, 0xFC, 0x01, 0x00, 0x00,
0x9E, 0x07, 0x00, 0x00, 0x07, 0x07, 0x00, 0x00, 0x07, 0x07, 0x00, 0x00,
0x0F, 0x07, 0x00, 0x00, 0xFE, 0x03, 0x00, 0x00, 0xF8, 0x00, 0x00, 0x00,
};
const char* server = "api.github.com"; // Server URL
const char* test_root_ca = \
"-----BEGIN CERTIFICATE-----\n"
"MIIEsTCCA5mgAwIBAgIQBOHnpNxc8vNtwCtCuF0VnzANBgkqhkiG9w0BAQsFADBs\n"
"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
"d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j\n"
"ZSBFViBSb290IENBMB4XDTEzMTAyMjEyMDAwMFoXDTI4MTAyMjEyMDAwMFowcDEL\n"
"MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3\n"
"LmRpZ2ljZXJ0LmNvbTEvMC0GA1UEAxMmRGlnaUNlcnQgU0hBMiBIaWdoIEFzc3Vy\n"
"YW5jZSBTZXJ2ZXIgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC2\n"
"4C/CJAbIbQRf1+8KZAayfSImZRauQkCbztyfn3YHPsMwVYcZuU+UDlqUH1VWtMIC\n"
"Kq/QmO4LQNfE0DtyyBSe75CxEamu0si4QzrZCwvV1ZX1QK/IHe1NnF9Xt4ZQaJn1\n"
"itrSxwUfqJfJ3KSxgoQtxq2lnMcZgqaFD15EWCo3j/018QsIJzJa9buLnqS9UdAn\n"
"4t07QjOjBSjEuyjMmqwrIw14xnvmXnG3Sj4I+4G3FhahnSMSTeXXkgisdaScus0X\n"
"sh5ENWV/UyU50RwKmmMbGZJ0aAo3wsJSSMs5WqK24V3B3aAguCGikyZvFEohQcft\n"
"bZvySC/zA/WiaJJTL17jAgMBAAGjggFJMIIBRTASBgNVHRMBAf8ECDAGAQH/AgEA\n"
"MA4GA1UdDwEB/wQEAwIBhjAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIw\n"
"NAYIKwYBBQUHAQEEKDAmMCQGCCsGAQUFBzABhhhodHRwOi8vb2NzcC5kaWdpY2Vy\n"
"dC5jb20wSwYDVR0fBEQwQjBAoD6gPIY6aHR0cDovL2NybDQuZGlnaWNlcnQuY29t\n"
"L0RpZ2lDZXJ0SGlnaEFzc3VyYW5jZUVWUm9vdENBLmNybDA9BgNVHSAENjA0MDIG\n"
"BFUdIAAwKjAoBggrBgEFBQcCARYcaHR0cHM6Ly93d3cuZGlnaWNlcnQuY29tL0NQ\n"
"UzAdBgNVHQ4EFgQUUWj/kK8CB3U8zNllZGKiErhZcjswHwYDVR0jBBgwFoAUsT7D\n"
"aQP4v0cB1JgmGggC72NkK8MwDQYJKoZIhvcNAQELBQADggEBABiKlYkD5m3fXPwd\n"
"aOpKj4PWUS+Na0QWnqxj9dJubISZi6qBcYRb7TROsLd5kinMLYBq8I4g4Xmk/gNH\n"
"E+r1hspZcX30BJZr01lYPf7TMSVcGDiEo+afgv2MW5gxTs14nhr9hctJqvIni5ly\n"
"/D6q1UEL2tU2ob8cbkdJf17ZSHwD2f2LSaCYJkJA69aSEaRkCldUxPUd1gJea6zu\n"
"xICaEnL6VpPX/78whQYwvwt/Tv9XBZ0k7YXDK/umdaisLRbvfXknsuvCnQsH6qqF\n"
"0wGjIChBWUMo0oHjqvbsezt3tkBigAVBRQHvFwY+3sAzm2fTYS5yh+Rp/BIAV0Ae\n"
"cPUeybQ=\n"
"-----END CERTIFICATE-----\n";
// You can use x.509 client certificates if you want
//const char* test_client_key = ""; //to verify the client
//const char* test_client_cert = ""; //to verify the client
String github_data;
WiFiClientSecure client;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(115200);
delay(100);
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
WiFi.begin(ssid, password);
tft.begin();
tft.setRotation(3);
tft.fillScreen(TFT_BLACK);
tft.setTextSize(2);
tft.setCursor((320 - tft.textWidth("Connecting to Wi-Fi.."))/2, 120);
tft.print("Connecting to Wi-Fi..");
// attempt to connect to Wifi network:
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
// wait 1 second for re-trying
delay(1000);
}
Serial.print("Connected to ");
Serial.println(ssid);
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("Connected!"))/2, 120);
tft.print("Connected!");
getData();
}
void loop() {
// do nothing
}
void getData() {
client.setCACert(test_root_ca);
//client.setCertificate(test_client_key); // for client verification
//client.setPrivateKey(test_client_cert); // for client verification
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("Conectting to Server.."))/2, 120);
tft.print("Connecting to Server..");
Serial.println("\nStarting connection to server...");
if (!client.connect(server, 443)) {
Serial.println("Connection failed!");
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("Connection failed!"))/2, 120);
tft.print("Connection failed!");
} else {
Serial.println("Connected to server!");
tft.fillScreen(TFT_BLACK);
tft.setCursor((320 - tft.textWidth("Connected to Server!"))/2, 120);
tft.print("Connected to Server!");
// Make a HTTP request:
client.println("GET https://api.github.com/repos/micropython/micropython HTTP/1.0");
client.println("Host: api.github.com");
client.println("User-Agent: Seeed-Studio");
client.println("Connection: close");
client.println();
while (client.connected()) {
String line = client.readStringUntil('\n');
if (line == "\r") {
Serial.println("headers received");
break;
}
}
while(client.available())
{
String line = client.readStringUntil('\r');
github_data = line;
}
//Serial.println(github_data);
client.stop();
Serial.println("closing connection");
}
//ArduinoJson to parse data, plesae check ArduinoJson for more info
const size_t capacity = 2*JSON_OBJECT_SIZE(18) + JSON_OBJECT_SIZE(77) + 6050;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, github_data);
int subscribers_count = doc["subscribers_count"];
int forks = doc["forks"];
int stargazers_count = doc["stargazers_count"];
Serial.println(subscribers_count);
Serial.println(forks);
Serial.println(stargazers_count);
//TFT SCREEN SESSION
tft.setFreeFont(FSS9);
tft.setTextSize(1);
tft.setTextColor(TFT_WHITE);
tft.fillScreen(TFT_BLACK);
tft.drawString("MicroPython Github",20,10);
tft.drawFastHLine(185,18,120 ,TFT_RED);
tft.drawFastHLine(185,19,120 ,TFT_RED);
tft.drawFastHLine(185,20,120 ,TFT_RED);
tft.drawFastHLine(10,33,300 ,TFT_NAVY);
tft.drawFastHLine(10,34,300 ,TFT_NAVY);
tft.drawFastHLine(10,35,300 ,TFT_NAVY);
tft.drawXBitmap(20,60, watchIMG, 29, 27, TFT_WHITE);
tft.drawXBitmap(20,120, starIMG, 30, 30, TFT_WHITE);
tft.drawXBitmap(20,180, forkIMG, 30, 30, TFT_WHITE);
tft.setFreeFont(FMB9);
tft.drawString("Watchers: ",60, 68);
tft.drawString("Stars: ",60, 128);
tft.drawString("Forks: ",60, 188);
tft.drawNumber(subscribers_count, 165, 68);
tft.drawNumber(stargazers_count, 130, 128);
tft.drawNumber(forks, 130, 188);
}