Railway Crossing

Railway crossing: 2 red LEDs and Sound

Note: I am just beginning with Raspberry Pi and Python, this project is not meant to be perfect.

Material

• Raspberry Pi Zero WH
• 3W Mono Amp HAT (https://shop.pimoroni.com/products/audio-amp-shim-3w-mono-amp)
• 3W Speaker (https://www.conrad.ch/de/p/visaton-k-50-2-zoll-5-cm-kleinlautsprecher-2-w-50-1173561.html)
• 2 LED and resistors
• 3D-Printer
• push button

Preparing the Raspberry

Install audio player

pip3 install python-vlc

sudo apt-get install vlc

add two lines to /boot/config.txt:

dtoverlay=hifiberry-dac
gpio=25=op,dh

commend this line out in /boot/config.txt:

# dtparam=audio=on

(See https://shop.pimoroni.com/products/audio-amp-shim-3w-mono-amp for details)

GPIOzero:

sudo apt install python3-gpiozero

Pi Connectors

• PIN 6: GND
• Pin 11 / GPIO 17: LED 1
• Pin 13 / GPIO 27: LED 2
• GPIO 18, 19, 21: Used by Audio Amp Shim
• PINs 1 + 21: Switch

Setup

• Checkout files to /home/pi/projects/bahnuebergang
• install service:

sudo sh /home/pi/projects/bahnuebergang/install_service.sh