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November 7, 2018 02:08
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CircuitPython Trellis M4 Keyboard Demo
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# CircuitPython + Trellis M4 Keyboard emulator. Fits in your pocket! | |
# using https://www.adafruit.com/product/4020 | |
# | |
# Should work on any PC | |
import time | |
import board | |
import digitalio | |
from adafruit_hid.keyboard import Keyboard | |
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS | |
from adafruit_hid.keycode import Keycode | |
# CircuitPython demo - Keypad | |
from digitalio import DigitalInOut | |
import board | |
import adafruit_matrixkeypad | |
# lights | |
cols = [] | |
for x in range(8): | |
cols.append(DigitalInOut(getattr(board, "COL{}".format(x)))) | |
rows = [] | |
for y in range(4): | |
rows.append(DigitalInOut(getattr(board, "ROW{}".format(y)))) | |
key_names = [] | |
for y in range(8): | |
row = [] | |
for x in range(4): | |
coord = (x, y) | |
row.append(coord) | |
key_names.append(row) | |
keypad = adafruit_matrixkeypad.Matrix_Keypad(cols, rows, key_names) | |
key_names = { | |
(0, 0): 'a', | |
(0, 1): 'b', | |
(0, 2): 'c', | |
(0, 3): 'd', | |
(0, 4): 'e', | |
(0, 5): 'f', | |
(0, 6): 'g', | |
(0, 7): 'h', | |
(1, 0): 'i', | |
(1, 1): 'j', | |
(1, 2): 'k', | |
(1, 3): 'l', | |
(1, 4): 'm', | |
(1, 5): 'n', | |
(1, 6): 'o', | |
(1, 7): 'p', | |
(2, 0): 'q', | |
(2, 1): 'r', | |
(2, 2): 's', | |
(2, 3): 't', | |
(2, 4): 'u', | |
(2, 5): 'v', | |
(2, 6): 'w', | |
(2, 7): 'x', | |
(3, 0): 'y', | |
(3, 1): 'z', | |
(3, 2): '.', | |
(3, 3): '!', | |
(3, 4): '?', | |
(3, 5): ' ', | |
(3, 6): ' ', | |
(3, 7): Keycode.BACKSPACE, | |
} | |
import neopixel | |
pixels = neopixel.NeoPixel(board.NEOPIXEL, 32, brightness=0.3, auto_write=False) | |
pixels.fill(0) | |
pixels.show() | |
# The keyboard object! | |
time.sleep(1) # Sleep for a bit to avoid a race condition on some systems | |
keyboard = Keyboard() | |
keyboard_layout = KeyboardLayoutUS(keyboard) # We're in the US :) | |
pressed = {} | |
while True: | |
keys = keypad.pressed_keys | |
if keys: | |
print("Pressed: ", keys) | |
for k in keys: | |
is_pressed = pressed.get(k, False) | |
if not is_pressed: | |
key = key_names.get(k, None) | |
if isinstance(key, str): # If it's a string... | |
keyboard_layout.write(key) # ...Print the string | |
else: # If it's not a string... | |
keyboard.press(key) # "Press"... | |
keyboard.release_all() # ..."Release"! | |
pixels[k[0] * 8 + k[1]] = (0, 0, 100) | |
pressed[k] = True | |
# unpress keys that aren't currently being held | |
for k, value in pressed.items(): | |
print("was pressed: ", k) | |
if k in keys: | |
print(" ", k, " is pressed") | |
else: | |
print(" k ", k, " was released") | |
pixels[k[0] * 8 + k[1]] = (0, 0, 0) | |
pressed[k] = False | |
else: | |
for k, value in pressed.items(): | |
pixels[k[0] * 8 + k[1]] = (0, 0, 0) | |
pressed[k] = False | |
pixels.show() | |
time.sleep(0.01) |
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