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You can control a Raspberry Pi Pico W output from a browser by connecting the board to Wi-Fi, running an Arduino-Pico WebServer, and having a route handler set the GPIO state. Open the board’s local IP address from a device on the same network. The wireless steps below require a Pico W or another Wi-Fi-capable board; the standard Raspberry Pi Pico does not have onboard Wi-Fi.
What you need before you start
- A Raspberry Pi Pico W or another Wi-Fi-capable board supported by the Arduino-Pico core.
- Arduino IDE with the Arduino-Pico core installed.
- The name and password for the Wi-Fi network the board will join.
- A GPIO output to control. The example uses the board LED; external loads need appropriate driver circuitry and wiring.
The Arduino-Pico project documents support for Pico W and other RP2040- and RP2350-based boards. Its Boards Manager installation process is sufficient for ordinary board programming. See the Arduino-Pico installation guide and supported-board project documentation.
Install Arduino-Pico and select your board
- In Arduino IDE, open Preferences and add the Arduino-Pico package index URL specified in the installation guide.
- Open Boards Manager, find the Raspberry Pi Pico/RP2040/RP2350 Arduino core, and install it.
- From the board selector, choose the board that matches your hardware. For the onboard Wi-Fi method in this guide, select Pico W rather than the standard Pico.
Board names and menu placement can vary by Arduino IDE version. Confirm that the selected board is the actual model you connected before compiling or uploading.
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The Arduino-Pico HelloServer example uses station mode: the Pico joins an existing Wi-Fi network, waits for a successful connection, and prints its local IP address. Replace the example network credentials with yours, then upload the sketch.
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#include <WiFi.h>
#include <WebServer.h>
const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";
WebServer server(80);
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
}
Serial.println(WiFi.localIP());
}
void loop() {
server.handleClient();
}Open the IDE’s Serial Monitor at 115200 baud after uploading. The address printed by WiFi.localIP() is the one to enter in a browser on a device connected to the same local network. The snippet shows the connection pattern; a complete sketch must also configure the output, register routes, and start the server.
Make a web route change an output
A route handler connects a requested URL to an action in the sketch. Configure the output pin before using it, register a route with server.on(), send a response with server.send(), and start the HTTP server with server.begin(). Call server.handleClient() repeatedly in loop() so incoming requests are serviced.
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const int outputPin = LED_BUILTIN;
void turnOn() {
digitalWrite(outputPin, HIGH);
server.send(200, "text/plain", "Output is on");
}
void turnOff() {
digitalWrite(outputPin, LOW);
server.send(200, "text/plain", "Output is off");
}
// In setup(), after Wi-Fi connects:
pinMode(outputPin, OUTPUT);
server.on("/on", turnOn);
server.on("/off", turnOff);
server.begin();Merge the route registration and startup lines into setup(), and keep the request-servicing call in loop(). With the server running, request http://<Pico-IP>/on or http://<Pico-IP>/off, replacing <Pico-IP> with the address printed in Serial Monitor. These routes set a known state, so repeating a request does not toggle unpredictably. For a page with clickable controls, a handler can instead return HTML containing links or buttons that request the corresponding routes.
The pattern follows the Arduino-Pico project’s HelloServer example and AdvancedWebServer example, which demonstrate Wi-Fi, HTTP routing, output setup, server startup, and request handling.
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Test the browser control on your local network
- Upload the complete sketch and open Serial Monitor. Wait for the Pico W to connect and print an IP address.
- Confirm the computer or phone you will use is connected to the same local network as the Pico W.
- Enter the printed address followed by
/onin the browser. The output should turn on and the browser should show the handler’s response. - Request
/offto set the output low.
This is local-network control, not a claim that the board is reachable over the public internet. The documented example prints a local address and starts an HTTP server; it does not establish remote-internet access.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use access-point mode for a direct connection
If you do not want the Pico to join an existing Wi-Fi network, the Arduino-Pico project also demonstrates access-point mode using WIFI_AP, WiFi.softAPConfig(), WiFi.softAP(), and a WebServer. In station mode, the board joins the LAN and the browser reaches it through that network. In access-point mode, the board creates a network for the phone or computer to join directly. Choose based on how the browser device should reach the Pico and whether the project needs to interact with other devices on the LAN; the examples do not establish comparative security or performance results.
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See the project’s DNSServer examples for the access-point pattern. It is an alternative network design, not a prerequisite for the station-mode approach above.
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The built-in LED is a simple way to verify that requests reach the sketch. For an external output, choose a GPIO supported by your board and configure it as OUTPUT before calling digitalWrite(). Check the board’s authoritative electrical specifications and use suitable driver circuitry for anything beyond a small indicator. The cited examples establish GPIO output use, but do not provide enough information to prescribe a universal current rating, resistor value, or driver component.
Quick Recap
Troubleshoot connection and route problems
- No IP address appears: Check the SSID and password, ensure the board is the Pico W or another Wi-Fi-capable model, and wait for
WL_CONNECTEDbefore readingWiFi.localIP(). - The browser cannot reach the board: Check that the browser device and Pico are on the same network, use the current IP printed after connection, and confirm the sketch calls
server.begin()andserver.handleClient(). - The page loads but the output does not change: Verify that the route path matches the requested URL, the handler is registered, and the pin is configured as an output before the route is used.
- The selected pin does not behave as expected: Check the board’s pin mapping and wiring for the selected board. Do not assume that every Pico-family board has identical onboard output wiring.
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