Input & buttons

Tactile switch

4-pin momentary tactile push button. Pins 1-2 are connected (left rail), pins 3-4 are connected (right rail). Pressing the button bridges both rails.

Width: 12.1 mm

Pinout — Tactile switch

Pin	Signal	Description
`1`	digital_input	Left top — connect to digital pin (INPUT_PULLUP)
`2`	gnd	Left bottom — connect to GND
`3`	digital_input	Right top — same as pin 1 (internally connected)
`4`	gnd	Right bottom — same as pin 2 (internally connected)

Wiring notes

Connect pin 1 to a digital GPIO pin (use INPUT_PULLUP) and pin 2 to GND. Pins 3-4 are the same connection as 1-2 (they are internally shorted in pairs). Only 2 wires needed: one to GPIO, one to GND.

Example wiring diagram — Tactile switch

From	To	Wire
`board:D2`	`x1:1`	green
`board:GND`	`x1:2`	black

Example Arduino code — Tactile switch

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

// Tactile switch example
// Wiring:
// - Switch pin 1 to Arduino D2
// - Switch pin 2 to Arduino GND
// Use the internal pull-up resistor, so the input reads HIGH when released
// and LOW when the button is pressed.

const int buttonPin = 2;
const int ledPin = 13;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
  Serial.println("Tactile switch demo started");
}

void loop() {
  bool pressed = (digitalRead(buttonPin) == LOW);

  digitalWrite(ledPin, pressed ? HIGH : LOW);

  Serial.print("Button state: ");
  Serial.println(pressed ? "PRESSED" : "RELEASED");

  delay(50);
}

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