KY-10 Light barrier

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) ; // Initialize output pin
  pinMode (Sensor, INPUT) ; // Initialize sensor pin
  digitalWrite(Sensor, HIGH) ; // Activate internal pull-up resistor
}
  
void loop ()
{
  val = digitalRead (Sensor) ; // The current signal at the sensor is read out
  
  if (val == HIGH) // If a signal could be detected, the LED is switched on.
  {
    digitalWrite (Led, LOW);
  }
  else
  {
    digitalWrite (Led, HIGH);
  }
}

This module contains a light barrier that emits a signal as long as the light beam is not interrupted. If something blocks the light beam, the signal is also interrupted. This makes the module ideal for applications where the detection of an interruption or movement is required.

The photoelectric sensor operates at an operating voltage of 3.3 V to 5 V, making it compatible with a wide range of microcontrollers and single-board computers. Such modules are often used in security systems, counting devices or automated control systems to detect the presence or movement of an object.

Thanks to its simple operation and reliable detection, this module offers a practical solution for many projects where passage or movement monitoring is required. Its compact size and easy integration make it a useful component for a wide range of applications.

Technical Data
Operating voltage	3,3 V - 5 V

Pin assignment

Raspberry Pi	Sensor
GPIO 24 [Pin 18]	Signal
3.3 V [Pin 1]	+V
GND [Pin 6]	GND

Code Example

This is a sample program that prints a console output when as signal is detected at the sensor.

from gpiozero import DigitalInputDevice
import time

# The input pin to which the sensor is connected is declared here.
# In addition, the PullUP resistor at the input is also deactivated
sensor = DigitalInputDevice(24, pull_up=False)

print("Sensor test [press CTRL+C to end the test]")

# This output function is executed when a signal is detected
def ausgabeFunktion():
    print("Signal recognized")

# When a signal is detected (rising signal edge), the output function is triggered
sensor.when_activated = ausgabeFunktion

# Main program loop
try:
    while True:
        time.sleep(1)

# Clean up after the program has been completed
except KeyboardInterrupt:
    print("Program was terminated by the user")

Sample program download

KY010-RPi.zip

To start with the command:

sudo python3 KY010-RPi.py

	
		pins.setPull(DigitalPin.P1, PinPullMode.PullUp)
		basic.forever(function () {
		    serial.writeLine("" + (pins.digitalReadPin(DigitalPin.P1)))
		    if (pins.digitalReadPin(DigitalPin.P1) == 1) {
		        serial.writeLine("ALARM !!!")
		    } else {
		        serial.writeLine("Ruhe")
		    }
		    serial.writeLine("______________________________________")
		    basic.pause(1000)
		})
	

# Load libraries
from machine import Pin, Timer

# Initialization of GPIO as input
sensor = Pin(18, Pin.IN, Pin.PULL_DOWN)

# Create timer
timer = Timer()

# Set counter to 0
counter = 0

# Function: Count steps
def step(timer):
    global counter
    counter = counter + 1
    print(counter)

# Function: Barrier
def barrier(pin):
    # Debounce function: Set timer
    timer.init(mode=Timer.ONE_SHOT, period=100, callback=step)

# Initialization interrupt
sensor.irq(trigger=Pin.IRQ_FALLING, handler=barrier)