409 lines
11 KiB
Python
409 lines
11 KiB
Python
import logging
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import functools
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from time import sleep
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from typing import Any, List
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from scipy.io.wavfile import write as writewav
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import sounddevice as sd
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import soundfile as sf
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import numpy as np
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from . import gpio_pins
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from picamera import PiCamera
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from gpiozero import Button, OutputDevice, PWMOutputDevice, PWMLED
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logger = logging.getLogger(__name__)
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# Constants
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VIDEO_RES = (1920, 1080) # Video Resolution
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PHOTO_RES = (2592, 1944) # Photo Resolution
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AUDIO_REC_SR = 44100 # Audio Recording Samplerate
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class Motor:
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def __init__(self, in1, in2, enable):
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self._in1 = OutputDevice(in1)
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self._in2 = OutputDevice(in2)
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self._en = PWMOutputDevice(enable)
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@property
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def direction(self):
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return self._in1.value > self._in2.value
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@direction.setter
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def direction(self, cw=True):
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if cw is None:
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self._in1.value = self._in2.value = 0
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if cw:
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self._in1.value = 1
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self._in2.value = 0
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else:
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self._in1.value = 0
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self._in2.value = 1
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@property
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def speed(self):
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return self._en.value * (1.0 if self.direction else -1.0)
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@speed.setter
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def speed(self, speed: float):
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"""
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Turn on motor. Negative speed = CCW direction
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:param speed: float [-1.0 .. 1.0]
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"""
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if self.speed == speed:
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return
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if speed == 0:
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self.off()
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return
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if abs(speed) > 1.:
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speed = 1. if speed > 0 else -1.
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self.direction = speed > 0
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self._en.value = abs(speed)
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def off(self):
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"""
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Stop motor
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"""
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logger.debug(f'motor{self}.off()')
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self._en.off()
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self.direction = None
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class ScrollSensor:
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def __init__(self, low_bit: int, high_bit: int, endstop: int):
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self._low = Button(low_bit, pull_up=False)
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self._high = Button(high_bit, pull_up=False)
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self._end = Button(endstop, pull_up=False)
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# self._low.when_released = self._callback
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# self.direction = 0
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# self.count = 0
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@property
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def is_home(self):
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"""
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:return: `True` if the endstops are active
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"""
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return self._high.value and self._end.value
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@property
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def eot_callback(self):
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return self._high.when_pressed
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@eot_callback.setter
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def eot_callback(self, callback):
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logger.debug(f'setting eot_callback={callback}')
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self._high.when_pressed = callback
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@property
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def stop_callback(self):
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return self._end.when_pressed
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@stop_callback.setter
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def stop_callback(self, callback):
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logger.debug(f'setting stop_callback={callback}')
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self._end.when_pressed = callback
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class PizzaHAL:
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"""
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This class holds a represenation of the pizza box hardware and provides
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methods to interact with it.
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- lights upper/lower on/off
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- motor up-down/left-right speed distance
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- scroll up-down/left-right positions
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- lid open/closed detectors
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- user interface buttons
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"""
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def __init__(self):
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self.btn_forward = Button(gpio_pins.BTN_FORWARD_GPIO)
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self.btn_back = Button(gpio_pins.BTN_BACK_GPIO)
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self.led_btn_fwd = PWMLED(gpio_pins.LED_FWD_BTN)
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self.led_btn_back = PWMLED(gpio_pins.LED_BACK_BTN)
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# self.lid_sensor = Button(gpio_pins.LID_SWITCH)
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self.ud_sensor = ScrollSensor(*gpio_pins.SCROLL_UPDOWN_SENSORS,
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gpio_pins.SCROLL_UPDOWN_ENDSTOP)
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self.lr_sensor = ScrollSensor(*gpio_pins.SCROLL_LR_SENSORS,
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gpio_pins.SCROLL_LR_ENDSTOP)
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self.motor_lr = Motor(*gpio_pins.MOTOR_CTRL_LR)
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self.motor_ud = Motor(*gpio_pins.MOTOR_CTRL_UPDOWN)
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self.led_layer = PWMOutputDevice(gpio_pins.LED_LAYER)
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self.led_backlight = PWMOutputDevice(gpio_pins.LED_BACKLIGHT)
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self.camera = None
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self.soundcache = {}
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self.blocked = False
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def blocking(func):
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@functools.wraps(func)
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def _wrapper(*args, **kwargs):
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hal = kwargs.get('hal', None)
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if hal is not None:
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logger.debug('blocking...')
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while hal.blocked:
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pass
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hal.blocked = True
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func(*args, **kwargs)
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if hal is not None:
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logger.debug('unblocking')
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hal.blocked = False
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sleep(0.1)
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return _wrapper
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@blocking
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def advance(motor: Motor, sensor: ScrollSensor, speed: float=0.3,
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direction: bool=True):
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"""
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Move the motor controlling the up-down scroll a given distance at a
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given speed.
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"""
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logger.debug(f'advance(motor={motor}, sensor={sensor}, speed={speed},'
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f'direction={direction})')
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if sensor.is_home and not direction:
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logger.debug('home reached, not advancing.')
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return
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sensor.stop_callback = motor.off
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sensor.eot_callback = motor.off
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motor.speed = speed if direction else -speed
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# Safety catch
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sleeptime = abs(5 / (speed * 10))
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sleep(sleeptime)
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motor.off()
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sensor.stop_callback = None
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sensor.eot_callback = None
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@blocking
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def rewind(motor: Motor, sensor: ScrollSensor, direction: bool=True,
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max_time: float=13.2):
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if sensor.is_home:
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return
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sensor.eot_callback = motor.off
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sensor.stop_callback = None
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motor.speed = -0.3 if direction else 0.3
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# Safety catch
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sleep(max_time)
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motor.off()
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def turn_off(hal: PizzaHAL):
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"""
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Rewind the scrolls to starting position
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:param hal: The hardware abstraction object
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"""
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hal.led_btn_back.off()
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hal.led_btn_fwd.off()
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hal.led_layer.off()
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hal.led_backlight.off()
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hal.btn_back.when_pressed = None
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hal.btn_back.when_held = None
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hal.btn_forward.when_pressed = None
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hal.btn_forward.when_held = None
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hal.motor_ud.off()
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hal.motor_lr.off()
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def wait_for_input(hal: PizzaHAL=None, go_callback: Any=None,
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back_callback: Any=None, **kwargs):
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"""
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Blink leds on buttons. Wait until the user presses a button, then execute
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the appropriate callback
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:param hal: The hardware abstraction object
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:param go_callback: called when button 'go' is pressed
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:param back_callback: called whan button 'back' is pressed
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"""
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hal.led_btn_fwd.blink(0.3, 0.3, 0.15, 0.15)
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hal.led_btn_back.blink(0.3, 0.3, 0.15, 0.15)
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hal.blocked = True
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hal.btn_forward.when_pressed = \
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_wrap_wait_btn(hal=hal, callback=go_callback, **kwargs)
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hal.btn_back.when_pressed = \
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_wrap_wait_btn(hal=hal, callback=back_callback, **kwargs)
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sleep(0.5)
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while hal.blocked:
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pass
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def _wrap_wait_btn(hal: PizzaHAL=None, callback: Any=None, **kwargs):
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@functools.wraps(callback)
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def wrapper():
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hal.blocked = True
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if callback is not None:
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callback(hal=hal, **kwargs)
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hal.btn_forward.when_pressed = None
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hal.btn_back.when_pressed = None
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hal.led_btn_back.off()
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hal.led_btn_fwd.off()
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hal.blocked = False
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return wrapper
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def _fade_led(led_pin: PWMOutputDevice, intensity: float, fade: float = 1.0,
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steps: int = 100):
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brightness = led_pin.value
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step = (intensity - brightness) / float(steps)
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wait = fade / float(steps)
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if step != 0.:
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for i in np.arange(brightness, intensity, step):
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led_pin.value = i
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sleep(wait)
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led_pin.value = intensity
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@blocking
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def light_layer(hal: PizzaHAL, intensity: float, fade: float = 0.0,
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steps: int = 100, **kwargs):
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"""
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Turn on the light to illuminate the upper scroll
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:param hal: The hardware abstraction object
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:param fade: float
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Default 0, time in seconds to fade in or out
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:param intensity: float
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Intensity of the light in percent
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:param steps: int
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How many steps for the fade (default: 10)
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"""
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if fade > 0.:
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_fade_led(hal.led_layer, intensity, fade, steps)
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else:
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hal.led_layer.value = intensity
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@blocking
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def backlight(hal: PizzaHAL, intensity: float, fade: float = 0.0,
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steps: int = 100, **kwargs):
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"""
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Turn on the backlight
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:param hal: The hardware abstraction object
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:param fade: float
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Default 0, time in seconds to fade in or out
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:param intensity: float
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Intensity of the light in percent
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:param steps: int
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How many steps for the fade (default: 10)
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"""
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if fade > 0.:
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_fade_led(hal.led_backlight, intensity, fade, steps)
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else:
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hal.led_backlight.value = intensity
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@blocking
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def play_sound(hal: PizzaHAL, sound: Any, **kwargs):
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"""
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Play a sound.
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:param hal: The hardware abstraction object
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:param sound: The sound to be played
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"""
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# Extract data and sampling rate from file
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try:
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data, fs = hal.soundcache.get(str(sound), sf.read(str(sound), dtype='float32'))
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sd.play(data, fs)
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sd.wait() # Wait until file is done playing
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except KeyboardInterrupt:
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logger.debug('skipped playback')
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# sd.stop()
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@blocking
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def record_sound(hal: PizzaHAL, filename: Any, duration: int,
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cache: bool = False, **kwargs):
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"""
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Record sound using the microphone
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:param hal: The hardware abstraction object
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:param filename: The path of the file to record to
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:param duration: The time to record in seconds
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:param cache: `True` to save recording to cache. Default is `False`
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"""
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myrecording = sd.rec(int(duration * AUDIO_REC_SR),
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samplerate=AUDIO_REC_SR,
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channels=2)
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sd.wait() # Wait until recording is finished
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writewav(str(filename), AUDIO_REC_SR, myrecording)
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if cache:
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hal.soundcache[str(filename)] = (myrecording, AUDIO_REC_SR)
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@blocking
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def record_video(hal: PizzaHAL, filename: Any, duration: float, **kwargs):
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"""
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Record video using the camera
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:param hal: The hardware abstraction object
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:param filename: The path of the file to record to
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:param duration: The time to record in seconds
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"""
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hal.camera.resolution = VIDEO_RES
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hal.camera.start_recording(str(filename))
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hal.camera.wait_recording(duration)
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hal.camera.stop_recording()
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@blocking
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def take_photo(hal: PizzaHAL, filename: Any, **kwargs):
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"""
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Take a foto with the camera
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:param hal: The hardware abstraction object
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:param filename: The path of the filename for the foto
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"""
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hal.camera.resolution = PHOTO_RES
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hal.camera.capture(str(filename))
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@blocking
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def init_sounds(hal: PizzaHAL, sounds: List):
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"""
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Load prerecorded Sounds into memory
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:param hal:
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:param sounds: A list of sound files
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"""
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if hal.soundcache is None:
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hal.soundcache = {}
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for sound in sounds:
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# Extract data and sampling rate from file
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data, fs = sf.read(str(sound), dtype='float32')
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hal.soundcache[str(sound)] = (data, fs)
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@blocking
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def init_camera(hal: PizzaHAL):
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if hal.camera is None:
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hal.camera = PiCamera()
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