capture_input.py

#!/usr/bin/env python
from pyzmo import *
from evdev.ecodes import *
from evdev import InputDevice

import socket
TCP_IP = '127.0.0.1'
TCP_PORT = 8000

import serial
ser = serial.Serial('/dev/ttyS2', 9600, timeout=1)

# kinda messy implementation, but make it match the Teensy's expected inputs
serial_dict = {
    KEY_F5: b'0',
    KEY_PAGEUP: b'1',
    KEY_PAGEDOWN: b'2',
    KEY_DOT: b'3'
}


def send_tcp(message):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((TCP_IP, TCP_PORT))
    s.send(message)
    s.close()


def send_serial(message):
    print('SERIAL: {}'.format(message))
    ser.write(message)


# triggered when KEY_PLAYPAUSE is pressed
@key(KEY_PAGEUP)
def pageup(events):
    print('LOCAL PAGEUP')
    send_tcp('TCP: LEFT ARROW PRESSED...')
    send_serial(serial_dict[KEY_PAGEUP])

@key(KEY_PAGEDOWN)
def pagedown(events):
    print('LOCAL PAGEDOWN')
    send_tcp('TCP: RIGHT ARROW BUTTON PRESSED...')
    send_serial(serial_dict[KEY_PAGEDOWN])

@key(KEY_F5, KEY_ESC)
def f5esc(events):
    print('LOCAL F5')
    send_tcp('TCP: PLAY BUTTON PRESSED...')
    send_serial(serial_dict[KEY_F5])

@key(KEY_DOT)
def dot(events):
    print('LOCAL DOT')
    send_tcp('TCP: SCREEN BUTTON PRESSED...')
    send_serial(serial_dict[KEY_DOT])

dev = InputDevice('/dev/input/event4')
dev.grab()
poll(dev)

teensy_keyboard.ino

void setup() {
  Serial1.begin(9600);
  Keyboard.begin();
  Serial1.begin(9600);  
}

void loop() {
  if (Serial1.available() > 0) {
    char inChar = Serial1.read();
    if (inChar == '0') {
      Keyboard.press(KEY_F5);
    }
    if (inChar == '1') {
      Keyboard.press(KEY_PAGE_UP);
    }
    if (inChar == '2') {
      Keyboard.press(KEY_PAGE_DOWN);
    }
    if (inChar == '3') {
      Keyboard.press('.');
    }

    Keyboard.releaseAll();
  }
}