GPIO是什么？

const long timeoutTime = 2000;

void setup() {

Serial.begin(115200);

// Initialize the output variables as outputs

pinMode(output5, OUTPUT);

pinMode(output4, OUTPUT);

// Set outputs to LOW

digitalWrite(output5, LOW);

digitalWrite(output4, LOW);

// Connect to Wi-Fi network with SSID and password

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(“.”);

}

// Print local IP address and start web server

Serial.println(“”);

Serial.println(“WiFi connected.”);

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

server.begin();

}

void loop(){

WiFiClient client = server.available(); // Listen for incoming clients

if (client) { // If a new client connects,

Serial.println(“New Client.”); // print a message out in the serial port

String currentLine = “”; // make a String to hold incoming data from the client

currentTime = millis();

previousTime = currentTime;

while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client’s connected

currentTime = millis();

if (client.available()) { // if there’s bytes to read from