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menu_book Course Curriculum (Raspberry Pi) expand_more
Linux & Setup
Raspberry Pi OS imaging headless SSH setup hostname configuration package updates systemd service basics journalctl logs environment variables Python virtual environment
GPIO Digital I/O
GPIO pin numbering digital output LED digital input button pull-up resistor button debounce PWM LED brightness GPIO cleanup edge detection
Sensors & Buses
I2C device scan I2C sensor read SPI overview SPI transfer UART serial read 1-Wire temperature sensor ADC via external chip sensor calibration
Automation
cron scheduled task systemd autostart app camera capture filesystem data logging MQTT publish MQTT subscribe HTTP sensor endpoint local SQLite logging
Networking & Services
static IP concept mDNS hostname Wi-Fi configuration SSH key authentication SFTP file transfer Nginx reverse proxy firewall with ufw network diagnostics
Hardware Projects
servo control ultrasonic distance sensor relay module safety RGB LED mixing buzzer tone PIR motion sensor rotary encoder safe shutdown button
Raspberry Pi / Hardware Projects

safe shutdown button

Learn safe shutdown button in Raspberry Pi with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Advanced
raspberry-pi-048.py
python 
from gpiozero import Button
from signal import pause
from subprocess import run
button=Button(3,pull_up=True,hold_time=2)
button.when_held=lambda: run(['sudo','shutdown','-h','now'],check=False)
pause()
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