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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
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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

rotary encoder

Learn rotary encoder in Raspberry Pi with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Advanced
raspberry-pi-047.py
python 
from gpiozero import RotaryEncoder
enc=RotaryEncoder(a=17,b=18,max_steps=0)
enc.when_rotated=lambda: print('steps:',enc.steps)
input('rotate; Enter to stop')
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