KY-004 Button-module

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Technical data / Short description

By pressing the button, the signal circuit is switched.


3 G V S.png

Code example Arduino

This example will light up a LED after the button is pressed.

The module KY-011, KY-016 or KY-029 can be used as a LED.

int Led = 13 ;// Declaration of the LED-output pin
int Sensor = 10; // Declaration of the sensor input pin
int val; // Temporary variable
void setup ()
  pinMode (Led, OUTPUT) ; // Initialization output pin
  pinMode (Sensor, INPUT) ; // Initialization sensor pin
  digitalWrite(Sensor, HIGH); // Activating internal pull-up resistor
void loop ()
  val = digitalRead (Sensor) ; // The current signal at the sensor will be read
  if (val == HIGH) // If a signal was detected, the LED will light up.
    digitalWrite (Led, LOW);
    digitalWrite (Led, HIGH);

Connections Arduino:

LED + = [Pin 13]
LED - = [Pin GND]
Sensor Signal = [Pin 10]
Sensor +V = [Pin 5V]
Sensor - = [Pin GND]

Example program download:


Code example Raspberry Pi

# needed modules will be imported
import RPi.GPIO as GPIO
import time
# The input pin of the Sensor will be declared. Additional to that the pull-up resistor will be activated.
GPIO.setup(GPIO_PIN, GPIO.IN, pull_up_down = GPIO.PUD_UP)
print "Sensor-Test [press ctrl+c to end it]"
# This output function will be started at signal detection.
def ausgabeFunktion(null):
        print("Signal detected")
# At the moment of detecting a Signal ( falling signal edge ) the output function will be activated.
GPIO.add_event_detect(GPIO_PIN, GPIO.FALLING, callback=ausgabeFunktion, bouncetime=100) 
# main program loop
        while True:
# Scavenging work after the end of the program
except KeyboardInterrupt:

Connections Raspberry Pi:

Signal = GPIO24 [Pin 18]
+V = 3,3V [Pin 1]
GND = GND [Pin 6]

Example program download


To start, enter the following command:

sudo python