Tactile Pushbutton Switch Module with 10kΩ Pull-Up — KY-004 Arduino Compatible

Tactile Pushbutton Switch Module with 10kΩ Pull-Up — KY-004 Arduino Compatible

This tactile pushbutton switch module (compatible with KY-004) simplifies button input for Arduino and microcontroller projects by including a built-in 10kΩ pull-up resistor on the PCB. No external resistor or wiring is needed — connect VCC, GND, and the signal pin to your Arduino, and the button is ready to use. The output is active LOW: normally HIGH (pulled to VCC), goes LOW when the button is pressed.

Module Specifications

• Compatible Module: KY-004 (same or similar)
• Operating Voltage: 3.3V – 5V DC
• Output Logic: Active LOW (normally HIGH, LOW when pressed)
• Pull-Up Resistor: Built-in 10kΩ to VCC
• Connector: 3-pin male header (1 × 3, 2.54mm pitch)
• PCB Dimensions: 19 × 16mm

Pin Connections

• ‘-’ (Pin 1): GND — connect to Arduino GND
• Center pin (Pin 2): VCC — connect to 3.3V or 5V (or leave unconnected if using MCU internal pull-ups)
• ‘S’ (Pin 3): Signal output — connect to Arduino digital input pin

Arduino Example

// KY-004 Pushbutton Module
const int buttonPin = 2;  // Connect S to D2
void setup() {
  pinMode(buttonPin, INPUT);  // No INPUT_PULLUP needed
  Serial.begin(9600);
}
void loop() {
  if (digitalRead(buttonPin) == LOW) {  // Active LOW
    Serial.println("Button pressed!");
  }
}

Typical Applications

• Arduino button input: Simplest possible button connection — 3 wires, no resistor
• Interrupt trigger: Connect S to an interrupt-capable pin for event-driven response
• Reset / confirm button: User confirmation input for menu systems and state machines
• Sensor kit projects: Standard button module in 37-in-1 and similar Arduino sensor kits
• Beginner projects: Ideal for learning digital input without external component wiring

Package Contents

• 1 × Tactile pushbutton switch module with 10kΩ pull-up (KY-004 compatible)

The simplest Arduino button module — built-in 10kΩ pull-up, active LOW output, 3-pin header. Connect 3 wires and start reading button presses immediately.