Trellis で beat machine をつくる(ControlPanel編)
目次
beat machine をつくる上で、音を鳴らすの同じくらい大事なコントロールパネル。
ミニマムで、これだけしたい。
- PLAY/STOP 操作
- BPM 切り換え
また、現在のBPMや拍子を視覚的に見せる員時ゲーターも欲しい。
ということで、8x8 matrix LED(3色)
タクトスイッチ2個。 AliExpressで購入したタッチ式のオン・オフスイッチを利用する。
Adafruit I2C通信の8x8 の制御
さすがAdfruit製。 circuitpython のライブラリがちゃんとある。
ドキュメント
source
配線
- sda ... GP0
- scl ...GP1
- play_btn_pin ... GP2
- mode_btn_pin ... GP3(今回未使用)
- sel_btn_pin ...GP4(BPM変更)
プログラム
install
adafruit_ht16k33 ライブラリのinstall が必要。
上記の https://github.com/adafruit/Adafruit_CircuitPython_HT16K33 をdownloadして、mac ならこんな感じにライブラリとしてcopyする。
bash
cp -r adafruit_ht16k33 /Volume/CIRCUITPY/libsource code
I2C I/F なので、こんな感じサンプルをつくってみた。
control_panel.py · Gistpython
import board
import busio
import displayio
import time
import digitalio
from adafruit_ht16k33.matrix import Matrix8x8x2
class ControlPanel:
def __init__(self, play_btn_pin, mode_btn_pin, sel_btn_pin, i2c):
# for Touch button
self.play_btn_ = digitalio.DigitalInOut(play_btn_pin)
self.play_btn_status_ = False
self.play_btn_.switch_to_input(pull=digitalio.Pull.DOWN)
# for BPM change and mode button(not use)
self.mode_btn_ = digitalio.DigitalInOut(mode_btn_pin)
self.mode_btn_status_ = True
self.mode_btn_.switch_to_input(pull=digitalio.Pull.UP)
self.sel_btn_ = digitalio.DigitalInOut(sel_btn_pin)
self.sel_btn_status_ = True
self.sel_btn_.switch_to_input(pull=digitalio.Pull.UP)
# 8x8 matrix LED(RED/GREEN/YELLOW)
self.matrix_ = Matrix8x8x2(i2c)
# BPM setting
self.bpm_index_ = 2 # default 60
self.numbers_ = [50, 55, 60, 100, 110, 120]
self.number_matrixes_ = [
[
# 50
# 1 2 3 4 5 6 7 8
[1, 1, 1, 0, 1, 1, 1, 1],
[1, 0, 0, 0, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 0, 0, 1],
[0, 0, 1, 0, 1, 0, 0, 1],
[0, 0, 1, 0, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 1, 1],
],
[
# 55
# 1 2 3 4 5 6 7 8
[1, 1, 1, 0, 1, 1, 1, 0],
[1, 0, 0, 0, 1, 0, 0, 0],
[1, 1, 1, 0, 1, 1, 1, 0],
[0, 0, 1, 0, 0, 0, 1, 0],
[0, 0, 1, 0, 0, 0, 1, 0],
[1, 1, 1, 0, 1, 1, 1, 0],
],
[
# 60
# 1 2 3 4 5 6 7 8
[1, 1, 1, 0, 1, 1, 1, 1],
[1, 0, 0, 0, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 1, 1],
],
[
# 100
# 1 2 3 4 5 6 7 8
[1, 0, 1, 1, 1, 1, 1, 1],
[1, 0, 1, 0, 1, 1, 0, 1],
[1, 0, 1, 0, 1, 1, 0, 1],
[1, 0, 1, 0, 1, 1, 0, 1],
[1, 0, 1, 0, 1, 1, 0, 1],
[1, 0, 1, 1, 1, 1, 1, 1],
],
[
# 110
# 1 2 3 4 5 6 7 8
[1, 0, 1, 0, 1, 1, 1, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 1],
[1, 0, 1, 0, 1, 1, 1, 1],
],
[
# 120
# 1 2 3 4 5 6 7 8
[1, 0, 1, 1, 1, 1, 1, 1],
[1, 0, 0, 0, 1, 1, 0, 1],
[1, 0, 0, 0, 1, 1, 0, 1],
[1, 0, 1, 1, 1, 1, 0, 1],
[1, 0, 1, 0, 0, 1, 0, 1],
[1, 0, 1, 1, 1, 1, 1, 1],
],
]
def get_event(self):
event = ""
if self.play_btn_status_ != self.play_btn_.value:
if self.play_btn_status_ is False:
# off -> on
event = "play"
if self.play_btn_status_ is True:
event = "stop"
self.play_btn_status_ = self.play_btn_.value
mode_btn_status = self.mode_btn_.value
if self.mode_btn_status_ != mode_btn_status:
if mode_btn_status is False:
event = "mode"
self.mode_btn_status_ = mode_btn_status
sel_btn_status = self.sel_btn_.value
if self.sel_btn_status_ != sel_btn_status:
if sel_btn_status is False:
event = "sel"
self.sel_btn_status_ = sel_btn_status
return event
def bpm_change(self):
self.bpm_index_ += 1
if self.bpm_index_ >= len(self.numbers_):
self.bpm_index_ = 0
def get_bpm_interval(self):
bpm = self.numbers_[self.bpm_index_]
tune_time = 8 # 1/8
nano_interval_of_beat = 60 * 1000_000_000 / bpm
interval = nano_interval_of_beat / (tune_time)
print(int(interval))
return interval
def display_bpm(self):
number_matrix = self.number_matrixes_[self.bpm_index_]
for y in range(6):
for x in range(8):
if number_matrix[y][x]:
self.matrix_[y, x] = self.matrix_.LED_YELLOW
else:
self.matrix_[y, x] = self.matrix_.LED_OFF
def display_tune(self, tune_no):
if tune_no == 0:
for x in range(1, 8):
self.matrix_[7, x] = self.matrix_.LED_OFF
self.matrix_[7, 0] = self.matrix_.LED_GREEN
else:
if tune_no < 4:
self.matrix_[7, tune_no] = self.matrix_.LED_GREEN
else:
self.matrix_[7, tune_no] = self.matrix_.LED_RED
if __name__ == "__main__":
sda = board.GP0
scl = board.GP1
play_btn_pin = board.GP2
mode_btn_pin = board.GP3
sel_btn_pin = board.GP4
i2c = busio.I2C(scl, sda)
ctl = ControlPanel(play_btn_pin, mode_btn_pin, sel_btn_pin, i2c)
# BPM default
tune_no = 0
ctl.display_bpm()
ctl.display_tune(tune_no)
interval = ctl.get_bpm_interval()
# nano second from nano second
now = time.monotonic_ns() + interval
next_time = now + interval
while True:
now = time.monotonic_ns()
event = ctl.get_event()
if event == "sel":
ctl.bpm_change()
ctl.display_bpm()
interval = ctl.get_bpm_interval()
elif event == "play":
next_time = now
elif event == "stop":
next_time = -1
if next_time == -1 or next_time > now:
# skip to next tune time
continue
next_time += interval
tune_no += 1
if tune_no >= 8:
tune_no = 0
ctl.display_tune(tune_no)
time.sleep(0.00001)demo
以下へ続く