KY-004 Key Switch Module

The KY-004 Key Switch Module is a push button that will close the circuit when pressed, sending a high signal.

This module is compatible with Arduino, Raspberry Pi, ESP32 and other platforms.

KY-004 Specifications

This module consists of a FZ1713 tactile push button, a 10kΩ resistor and 3 male header pins.

Connection Diagram

KY-004 Arduino Code

The following Arduino sketch will continually read the button state on the module, when the button is pressed it will send a HIGH signal that will turn on the Arduino’s LED on pin 13.

int led = 13; //Define the LED pin
int buttonpin = 3; //Define the push button pin
int val; //Define a numeric variable
void setup()
{
	pinMode(led,OUTPUT);
	pinMode(buttonpin,INPUT);
}
void loop()
{
	val = digitalRead(buttonpin); // check the state of the button
	if(val==HIGH) // if button is pressed, turn LED on
	{
		digitalWrite(led,HIGH);
	}
	else
	{
		digitalWrite(led,LOW);
	}
}

Downloads

• Fritzing Part: KY-004 Key Switch Module.
• Fritzing Official Site.

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