Parts

• 1x Raspberry PI
• 1x laser emitting diode
• 3x jumper cables

Schematics

IC in the schematics represents the following sensor.

Starting from left to right, connect first pin to GPIO23, second to 5V and third to GND.

Python Code

from gpiozero import LED
from time import sleep

laser_pin = 23 # BCM
timeout = 1  # seconds

laser = LED(laser_pin)

try:
    while True:
        laser.on()
        sleep(timeout)
        laser.off()
        sleep(timeout)
except KeyboardInterrupt:
    laser.off()