Add rotary knob volume control
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3 changed files with 285 additions and 9 deletions
45
main.py
45
main.py
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@ -10,6 +10,7 @@ from umqtt.simple import MQTTClient
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import ssd1306
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import mcp4
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from rotary_irq_esp import RotaryIRQ
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from statetree import StateTree
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VOLUME_MAX = const(128)
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@ -29,12 +30,24 @@ state = StateTree(
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)
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last_update = 0
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i2c = SoftI2C(sda=Pin(2), scl=Pin(16))
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oled_width = const(128)
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oled_height = const(32)
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oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
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buf = bytearray((oled_height // 8) * oled_width)
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fbuf = framebuf.FrameBuffer1(buf, oled_width, oled_height)
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rotary = RotaryIRQ(
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33,
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32,
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0,
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max_val=128,
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range_mode=RotaryIRQ.RANGE_BOUNDED,
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pull_up=True,
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)
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rotary_value = rotary.value()
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try:
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i2c = SoftI2C(sda=Pin(21), scl=Pin(22))
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oled_width = const(128)
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oled_height = const(32)
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oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
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except Exception as e:
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print("WARNING: OLED unavailable:", e)
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oled = None
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sta_if = network.WLAN(network.STA_IF)
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@ -65,11 +78,25 @@ def on_message(topic, msg):
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def loop():
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global mqtt, state, last_update
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global mqtt, state, last_update, rotary, rotary_value
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state["volume"]["left"] = pot.read(0)
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state["volume"]["right"] = pot.read(1)
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if state.changed:
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# Volume changed externally
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rotary.set(value=max(state["volume"]["left"], state["volume"]["right"]))
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rotary_value = rotary.value()
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new_value = rotary.value()
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if rotary_value != new_value:
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print("Rotary:", new_value)
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state["volume"]["left"] = new_value
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state["volume"]["right"] = new_value
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pot.write(0, new_value)
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pot.write(1, new_value)
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rotary_value = new_value
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if not sta_if.active():
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print("Connecting to WiFi")
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sta_if.active(True)
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@ -170,7 +197,7 @@ def loop():
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mqtt.publish(topic, payload, retain=True)
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last_update = utime.time()
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mqtt.check_msg()
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if state.changed:
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if oled and state.changed:
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oled.fill(0)
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oled.framebuf.rect(10, 0, 92, 8, 1)
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oled.framebuf.rect(
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@ -191,4 +218,4 @@ def loop():
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while True:
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loop()
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utime.sleep(1)
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utime.sleep(0.1)
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173
rotary.py
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173
rotary.py
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@ -0,0 +1,173 @@
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# MIT License (MIT)
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# Copyright (c) 2022 Mike Teachman
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# https://opensource.org/licenses/MIT
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# Platform-independent MicroPython code for the rotary encoder module
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# Documentation:
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# https://github.com/MikeTeachman/micropython-rotary
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import micropython
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_DIR_CW = const(0x10) # Clockwise step
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_DIR_CCW = const(0x20) # Counter-clockwise step
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# Rotary Encoder States
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_R_START = const(0x0)
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_R_CW_1 = const(0x1)
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_R_CW_2 = const(0x2)
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_R_CW_3 = const(0x3)
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_R_CCW_1 = const(0x4)
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_R_CCW_2 = const(0x5)
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_R_CCW_3 = const(0x6)
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_R_ILLEGAL = const(0x7)
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_transition_table = [
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# |------------- NEXT STATE -------------| |CURRENT STATE|
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# CLK/DT CLK/DT CLK/DT CLK/DT
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# 00 01 10 11
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[_R_START, _R_CCW_1, _R_CW_1, _R_START], # _R_START
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[_R_CW_2, _R_START, _R_CW_1, _R_START], # _R_CW_1
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[_R_CW_2, _R_CW_3, _R_CW_1, _R_START], # _R_CW_2
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[_R_CW_2, _R_CW_3, _R_START, _R_START | _DIR_CW], # _R_CW_3
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[_R_CCW_2, _R_CCW_1, _R_START, _R_START], # _R_CCW_1
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[_R_CCW_2, _R_CCW_1, _R_CCW_3, _R_START], # _R_CCW_2
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[_R_CCW_2, _R_START, _R_CCW_3, _R_START | _DIR_CCW], # _R_CCW_3
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[_R_START, _R_START, _R_START, _R_START]] # _R_ILLEGAL
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_transition_table_half_step = [
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[_R_CW_3, _R_CW_2, _R_CW_1, _R_START],
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[_R_CW_3 | _DIR_CCW, _R_START, _R_CW_1, _R_START],
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[_R_CW_3 | _DIR_CW, _R_CW_2, _R_START, _R_START],
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[_R_CW_3, _R_CCW_2, _R_CCW_1, _R_START],
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[_R_CW_3, _R_CW_2, _R_CCW_1, _R_START | _DIR_CW],
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[_R_CW_3, _R_CCW_2, _R_CW_3, _R_START | _DIR_CCW],
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[_R_START, _R_START, _R_START, _R_START],
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[_R_START, _R_START, _R_START, _R_START]]
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_STATE_MASK = const(0x07)
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_DIR_MASK = const(0x30)
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def _wrap(value, incr, lower_bound, upper_bound):
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range = upper_bound - lower_bound + 1
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value = value + incr
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if value < lower_bound:
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value += range * ((lower_bound - value) // range + 1)
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return lower_bound + (value - lower_bound) % range
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def _bound(value, incr, lower_bound, upper_bound):
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return min(upper_bound, max(lower_bound, value + incr))
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def _trigger(rotary_instance):
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for listener in rotary_instance._listener:
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listener()
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class Rotary(object):
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RANGE_UNBOUNDED = const(1)
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RANGE_WRAP = const(2)
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RANGE_BOUNDED = const(3)
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def __init__(self, min_val, max_val, incr, reverse, range_mode, half_step, invert):
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self._min_val = min_val
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self._max_val = max_val
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self._incr = incr
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self._reverse = -1 if reverse else 1
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self._range_mode = range_mode
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self._value = min_val
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self._state = _R_START
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self._half_step = half_step
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self._invert = invert
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self._listener = []
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def set(self, value=None, min_val=None, incr=None,
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max_val=None, reverse=None, range_mode=None):
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# disable DT and CLK pin interrupts
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self._hal_disable_irq()
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if value is not None:
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self._value = value
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if min_val is not None:
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self._min_val = min_val
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if max_val is not None:
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self._max_val = max_val
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if incr is not None:
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self._incr = incr
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if reverse is not None:
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self._reverse = -1 if reverse else 1
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if range_mode is not None:
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self._range_mode = range_mode
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self._state = _R_START
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# enable DT and CLK pin interrupts
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self._hal_enable_irq()
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def value(self):
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return self._value
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def reset(self):
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self._value = 0
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def close(self):
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self._hal_close()
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def add_listener(self, l):
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self._listener.append(l)
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def remove_listener(self, l):
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if l not in self._listener:
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raise ValueError('{} is not an installed listener'.format(l))
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self._listener.remove(l)
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def _process_rotary_pins(self, pin):
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old_value = self._value
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clk_dt_pins = (self._hal_get_clk_value() <<
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1) | self._hal_get_dt_value()
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if self._invert:
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clk_dt_pins = ~clk_dt_pins & 0x03
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# Determine next state
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if self._half_step:
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self._state = _transition_table_half_step[self._state &
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_STATE_MASK][clk_dt_pins]
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else:
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self._state = _transition_table[self._state &
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_STATE_MASK][clk_dt_pins]
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direction = self._state & _DIR_MASK
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incr = 0
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if direction == _DIR_CW:
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incr = self._incr
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elif direction == _DIR_CCW:
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incr = -self._incr
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incr *= self._reverse
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if self._range_mode == self.RANGE_WRAP:
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self._value = _wrap(
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self._value,
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incr,
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self._min_val,
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self._max_val)
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elif self._range_mode == self.RANGE_BOUNDED:
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self._value = _bound(
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self._value,
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incr,
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self._min_val,
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self._max_val)
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else:
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self._value = self._value + incr
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try:
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if old_value != self._value and len(self._listener) != 0:
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_trigger(self)
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except:
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pass
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76
rotary_irq_esp.py
Normal file
76
rotary_irq_esp.py
Normal file
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@ -0,0 +1,76 @@
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# MIT License (MIT)
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# Copyright (c) 2020 Mike Teachman
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# https://opensource.org/licenses/MIT
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# Platform-specific MicroPython code for the rotary encoder module
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# ESP8266/ESP32 implementation
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# Documentation:
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# https://github.com/MikeTeachman/micropython-rotary
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from machine import Pin
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from rotary import Rotary
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from sys import platform
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_esp8266_deny_pins = [16]
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class RotaryIRQ(Rotary):
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def __init__(self, pin_num_clk, pin_num_dt, min_val=0, max_val=10, incr=1,
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reverse=False, range_mode=Rotary.RANGE_UNBOUNDED, pull_up=False, half_step=False, invert=False):
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if platform == 'esp8266':
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if pin_num_clk in _esp8266_deny_pins:
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raise ValueError(
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'%s: Pin %d not allowed. Not Available for Interrupt: %s' %
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(platform, pin_num_clk, _esp8266_deny_pins))
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if pin_num_dt in _esp8266_deny_pins:
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raise ValueError(
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'%s: Pin %d not allowed. Not Available for Interrupt: %s' %
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(platform, pin_num_dt, _esp8266_deny_pins))
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super().__init__(min_val, max_val, incr, reverse, range_mode, half_step, invert)
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if pull_up == True:
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self._pin_clk = Pin(pin_num_clk, Pin.IN, Pin.PULL_UP)
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self._pin_dt = Pin(pin_num_dt, Pin.IN, Pin.PULL_UP)
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else:
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self._pin_clk = Pin(pin_num_clk, Pin.IN)
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self._pin_dt = Pin(pin_num_dt, Pin.IN)
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self._enable_clk_irq(self._process_rotary_pins)
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self._enable_dt_irq(self._process_rotary_pins)
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def _enable_clk_irq(self, callback=None):
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self._pin_clk.irq(
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trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING,
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handler=callback)
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def _enable_dt_irq(self, callback=None):
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self._pin_dt.irq(
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trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING,
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handler=callback)
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def _disable_clk_irq(self):
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self._pin_clk.irq(handler=None)
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def _disable_dt_irq(self):
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self._pin_dt.irq(handler=None)
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def _hal_get_clk_value(self):
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return self._pin_clk.value()
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def _hal_get_dt_value(self):
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return self._pin_dt.value()
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def _hal_enable_irq(self):
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self._enable_clk_irq(self._process_rotary_pins)
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self._enable_dt_irq(self._process_rotary_pins)
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def _hal_disable_irq(self):
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self._disable_clk_irq()
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self._disable_dt_irq()
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def _hal_close(self):
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self._hal_disable_irq()
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