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Built-in project · Raspberry Pi Pico

Pico arcade button

A 30 mm arcade button on GP15 lights a lamp on GP14 and the Pico's own LED while it is held. The whole build, a Raspberry Pi Pico and 3 more parts, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.

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Pico arcade button · Raspberry Pi Picolive0.000 s 0.00x
Hold the button
The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.

The code

The firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.

sketch.ino · Raspberry Pi Pico
// Button: read a pin, drive a pin.
//
// Wire a pushbutton from GP15 to any GND pin. INPUT_PULLUP switches on the
// pad's 55 k pull-up, so the pin reads HIGH when the button is up and LOW when
// it is pressed: no external resistor, and no floating input.
//
// GP25, the on-board LED, is inside the module, so the sketch lights GP14 as
// well for an LED on the breadboard.

const int BUTTON = 15;
const int LED = 14;

void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  int pressed = digitalRead(BUTTON) == LOW ? HIGH : LOW;
  digitalWrite(LED_BUILTIN, pressed);
  digitalWrite(LED, pressed);
}

Parts list

5 parts, plus the jumper wires. Every one is in the editor's parts bin.

How it is wired

4 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.

  • Ground: Raspberry Pi Pico pin GND; LED, green pin C; Arcade button pin 1
  • Raspberry Pi Pico pin GP14; Resistor, 220 Ω pin 1
  • Raspberry Pi Pico pin GP15; Arcade button pin 2
  • Resistor, 220 Ω pin 2; LED, green pin A

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