Hey there I'm trying to send some temperature information to a webpage with my Pico W. I've been following the example here. Whenever I try to access the address that gets assigned to my Pico, nothing loads and I never see a "new client" message in the serial monitor. I suspect this has something to do with how I've configured the server. I get a warning saying server.available() is deprecated, but when I check the documentation for the WiFi library I don't see that.
Here is the relevant code that is not working:
void loop() {
// temp sensor logic ...
WiFiClient client = server.available();
if (client) {
Serial.println("New client connected");
String response = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
response += "<!DOCTYPE html><html><body>";
response += "<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\">\n";
response += "<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}\n";
response += "body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;}\n";
response += "p {font-size: 24px;color: #444444;margin-bottom: 10px;}\n";
response += "</style>\n";
response += "</head>\n";
response += "<body>\n";
response += "<h1>Raspberry Pi Pico W Weather Station</h1>";
response += "<p>Temperature: <span id=\"temperature\"></span>" + String(temp)+ "°C</p>";
response += "<p>Humidity: <span id=\"humidity\"></span> " + String(humidity) + " %</p>";
response += "</body></html>";
client.print(response);
delay(10);
client.stop();
Serial.println("Client disconnected");
}
}
And here is the full code
#include <DHT11.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
DHT11 dht11(16);
LiquidCrystal_I2C lcd(0x27, 20, 4);
const int buttonPin = 15;
bool celsius = true;
int lastButtonState = LOW;
unsigned long lastPressTime = 0;
const unsigned long debounceDelay = 50;
const char* ssid = "Network ID goes here";
const char* password = "Network password goes here";
WiFiServer server(80);
unsigned long currentTime = millis();
unsigned long previousTime = 0;
// Define timeout time in milliseconds
const long timeoutTime = 10000;
String header;
void setup() {
pinMode(buttonPin, INPUT);
Serial.begin(9600);
lcd.init();
lcd.backlight();
// Initialize wifi
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while(WiFi.status() != WL_CONNECTED) {
Serial.println("Connecting to wifi...");
delay(2500);
}
// Connection established
Serial.println();
Serial.print("Pico Dubya successfully connected to: ");
Serial.println(WiFi.SSID());
Serial.print("Assigned IP Address: ");
Serial.println(WiFi.localIP());
// Start web server
server.begin();
}
void loop() {
// On screen temperature logic and button debounce
int currentButtonState = digitalRead(buttonPin);
// Check if the button state is HIGH (pressed) and if enough time has passed since the last press
if (currentButtonState == HIGH && lastButtonState == LOW && (millis() - lastPressTime) > debounceDelay) {
Serial.println("Button pressed!");
celsius = !celsius; // Toggle Celsius/Fahrenheit
lastPressTime = millis(); // Update the last press time
}
lastButtonState = currentButtonState;
// Read temperature and humidity from the sensor, only integers for this model =(
int humidity = dht11.readHumidity();
int temp = dht11.readTemperature();
// Writing to LCD
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.setCursor(6, 0);
lcd.print(celsius ? temp : (temp * 9 / 5 + 32));
lcd.setCursor(8, 0);
lcd.print((char)223);
lcd.setCursor(10, 0);
lcd.print(celsius ? "C" : "F");
lcd.setCursor(0, 1);
lcd.print("Humidity: ");
lcd.setCursor(10, 1);
lcd.print(humidity);
lcd.setCursor(12, 1);
lcd.print("%");
delay(10);
WiFiClient client = server.available();
if (client) {
Serial.println("New client connected");
String response = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
response += "<!DOCTYPE html><html><body>";
response += "<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\">\n";
response += "<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}\n";
response += "body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;}\n";
response += "p {font-size: 24px;color: #444444;margin-bottom: 10px;}\n";
response += "</style>\n";
response += "</head>\n";
response += "<body>\n";
response += "<h1>Raspberry Pi Pico W Weather Station</h1>";
response += "<p>Temperature: <span id=\"temperature\"></span>" + String(temp)+ "°C</p>";
response += "<p>Humidity: <span id=\"humidity\"></span> " + String(humidity) + " %</p>";
response += "</body></html>";
client.print(response);
delay(10);
client.stop();
Serial.println("Client disconnected");
}
}
