I decided that I didn’t like the sound of the terminal bell on my computer. Wouldn’t it be nicer if it was an actual bell?
So, I got a Raspberry Pi, a servo motor and some lego and built a real terminal one.
I didn’t want to spend long on it, so I used some example Python code from https://tutorials-raspberrypi.com/raspberry-pi-servo-motor-control/ and added a Web server so that I could trigger the bell remotely.
from flask import Flask import RPi.GPIO as GPIO import time # Create Flask app. app = Flask(__name__) # Start GPIO up. servoPIN = 17 GPIO.setmode(GPIO.BCM) GPIO.setup(servoPIN, GPIO.OUT) p = GPIO.PWM(servoPIN, 50) # GPIO 17 for PWM with 50Hz p.start(2.5) # Initialization @app.route("/ding") def hello(): p.ChangeDutyCycle(7.5) time.sleep(0.3) p.ChangeDutyCycle(6.5) time.sleep(0.6) return "dong" if __name__ == '__main__': try: app.run(host = '0.0.0.0',port=5005) except KeyboardInterrupt: p.stop() GPIO.cleanup()
With that in place, I could get the bell to ring using curl.
My son and I then set to work building a lego case.
I use https://github.com/tmux/tmux to manage my terminal, so it was a simple case of using the built-in hook feature (https://devel.tech/tips/n/tMuXz2lj/the-power-of-tmux-hooks/) to run the command when the bell rings, and to disable the bell sound on my mac:
set-hook -g alert-bell 'run-shell "curl 192.168.0.52:5005/ding"'
Ah… much nicer.
You can see a video and hear it in action at https://youtu.be/luuI4S4y9-I