Flasher

A simple Raspberry Pi LED flashing utility. Pipe text data into it and it will flash an LED

Electronics

You'll need an LED and a resistor

Pin 11 (GPIO17/GEN0) ---> LED ---> 330 ohm Resistor ---> Pin 6 (GND)

Usage

# flash once
echo "Flash" | sudo node flasher.js

# flash every time a line is added to /var/log/messages
tail -f /var/log/messages | sudo node flasher.js
    
# flash every time traffic arrives on port 80
sudo tcpdump -i eth0 'tcp port 80' | sudo node flasher.js 

Optional parameters

• pin - the number of the GPIO pin to flash (default 11)
• ms - the number of milliseconds to flash for (default 50)
• usage - print the usage information

e.g.

tail -f /var/log/messages | sudo node flasher.js --pin 11 --ms 100