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Built-in project · Arduino Nano RP2040 Connect

Nano RP2040 button

A pushbutton on D2 of the Nano RP2040 Connect lights the LED on D13, with the RP2040’s own pull-up and the Nano’s pin names. The whole build, an Arduino Nano RP2040 Connect and 1 more part, 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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The parts retail for about $34. On Mokxi they're free.

Nano RP2040 button · Arduino Nano RP2040 Connectlive0.000 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 · Arduino Nano RP2040 Connect
// Button: a pushbutton on D2 lights the LED on D13.
//
// INPUT_PULLUP switches on the pad's pull-up, so D2 sits at 3.3 V until the
// button pulls it to GND and reads LOW while it is held. D2 is GPIO 25.

const int BUTTON = D2;

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

void loop() {
  digitalWrite(LED_BUILTIN, digitalRead(BUTTON) == LOW ? HIGH : LOW);
  delay(5);
}

Parts list

3 parts, plus the jumper wires. They retail for about $34; on Mokxi they're free.

How it is wired

2 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: Arduino Nano RP2040 Connect pin GND; Pushbutton pin 2b
  • Arduino Nano RP2040 Connect pin D2; Pushbutton pin 1a

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