serveur-web-led.ino
The MKR WiFi 1010 becomes an IoT device: it hosts a lite HTML page with two links that switch an LED on pin 6. No cloud infrastructure — the page opens from any device on the local network, phones included.
Hardware
An Arduino MKR WiFi 1010 (SAMD21 microcontroller, WINC1500 Wi-Fi module, no Bluetooth, USB or LiPo power on J6). MKR WiFi 1010, LED + 330 Ω resistor on pin 6, same WiFi network as the phone.
Wiring
LED (+) → 330 Ω resistor → pin 6, cathode to GND; the serial-printed IP opens in the browser.
How it works
WiFiServer listens on port 80; each HTTP request is read to its first line, compared to /on or /off, then a minimal page is returned. Refreshing shows the current state.
Running it
Install Arduino SAMD Boards and the WiFi101 library, select the board, upload. Wi-Fi runs on 2.4 GHz only: check that your access point is not 5 GHz only.
Variants
Add query parameters (?value=512) for a digital potentiometer, or a meta refresh tag for a self-updating state.
serveur-web-led.ino
// Serveur web MKR WiFi 1010 : /on et /off pilotent la LED broche 6.
#include <SPI.h>
#include <WiFi101.h>
const char SSID[] = "MonReseau";
const char PASS[] = "motdepassewifi";
WiFiServer serveur(80);
const int LED = 6;
void setup() {
Serial.begin(9600);
pinMode(LED, OUTPUT);
WiFi.begin(WPA_PASS_PHRASE, SSID, PASS);
while (WiFi.status() != WL_CONNECTED) delay(100); // IP via DHCP
Serial.println(WiFi.localIP()); // a ouvrir dans le navigateur
serveur.begin();
}
void loop() {
WiFiClient client = serveur.available();
if (!client) return;
String requete = client.readStringUntil('
'); // ligne GET /...
if (requete.startsWith("GET /on")) digitalWrite(LED, HIGH);
if (requete.startsWith("GET /off")) digitalWrite(LED, LOW);
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html\r\n");
client.println("<a href='/on'>ALLUMER</a><br>");
client.println("<a href='/off'>ETEINDRE</a><br>");
client.println(digitalRead(LED) ? "LED : ON" : "LED : OFF");
delay(10);
client.stop();
}