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Merge pull request adafruit#1018 from adafruit/ble_synth
Adding code files for BLE synth Learn Guide
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‎BLE_Synth/cpb_amp_code.py

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'''BLE Synth
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File for the Circuit Playground Bluefruit
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Amp Portion'''
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from adafruit_circuitplayground.bluefruit import cpb
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from adafruit_led_animation.animation import Comet, AnimationGroup,\
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AnimationSequence
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import adafruit_led_animation.color as color
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from adafruit_ble import BLERadio
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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from adafruit_ble.services.nordic import UARTService
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from adafruit_bluefruit_connect.packet import Packet
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from adafruit_bluefruit_connect.color_packet import ColorPacket
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from adafruit_bluefruit_connect.button_packet import ButtonPacket
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# easily call for NeoPixels to be off
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off = (0, 0, 0)
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# state to debounce on CPB end
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tone = False
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# Setup for comet animation
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COMET_SPEED = 0.04 # Lower numbers increase the animation speed
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CPB_COMET_TAIL_LENGTH = 5 # The length of the comet on the Circuit Playground Bluefruit
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CPB_COMET_BOUNCE = False # Set to True to make the comet "bounce" the opposite direction on CPB
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animations = AnimationSequence(
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AnimationGroup(
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Comet(cpb.pixels, COMET_SPEED, off, tail_length=CPB_COMET_TAIL_LENGTH,
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bounce=CPB_COMET_BOUNCE)))
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# note frequencies
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C4 = 261.63
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Csharp4 = 277.18
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D4 = 293.66
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Dsharp4 = 311.13
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E4 = 329.63
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F4 = 349.23
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Fsharp4 = 369.99
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G4 = 392
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Gsharp4 = 415.3
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A4 = 440
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Asharp4 = 466.16
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B4 = 493.88
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# note array
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note = [C4, Csharp4, D4, Dsharp4, E4, F4,
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Fsharp4, G4, Gsharp4, A4, Asharp4, B4]
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# colors to recieve from color packet & for neopixels
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color_C = color.RED
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color_Csharp = color.ORANGE
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color_D = color.YELLOW
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color_Dsharp = color.GREEN
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color_E = color.TEAL
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color_F = color.CYAN
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color_Fsharp = color.BLUE
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color_G = color.PURPLE
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color_Gsharp = color.MAGENTA
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color_A = color.GOLD
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color_Asharp = color.PINK
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color_B = color.WHITE
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# color array
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color = [color_C, color_Csharp, color_D, color_Dsharp, color_E,
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color_F, color_Fsharp, color_G, color_Gsharp, color_A,
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color_Asharp, color_B]
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# Setup BLE connection
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ble = BLERadio()
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uart = UARTService()
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advertisement = ProvideServicesAdvertisement(uart)
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while True:
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# connect via BLE
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ble.start_advertising(advertisement) # Start advertising.
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was_connected = False
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while not was_connected or ble.connected:
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if ble.connected: # If BLE is connected...
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was_connected = True
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# start animations
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animations.animate()
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# look for packets
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if uart.in_waiting:
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try:
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packet = Packet.from_stream(uart) # Create the packet object.
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except ValueError:
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continue
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# if it's a color packet:
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if isinstance(packet, ColorPacket):
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for i in range(12):
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colors = color[i]
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notes = note[i]
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# if the packet matches one of our colors:
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if packet.color == colors and not tone:
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# animate with that color
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animations.color = colors
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# play matching note
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cpb.start_tone(notes)
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tone = True
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# if it's a button packet aka feather's button has been released:
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elif isinstance(packet, ButtonPacket) and packet.pressed:
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if packet.button == ButtonPacket.RIGHT and tone:
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tone = False
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# stop playing the note
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cpb.stop_tone()
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# turn off the neopixels but keep animation active
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animations.color = off

‎BLE_Synth/feather_keyboard_code.py

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'''BLE Synth
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File for the Feather nFR52840
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Keyboard Portion'''
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import time
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import board
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import digitalio
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import adafruit_led_animation.color as color
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from adafruit_ble import BLERadio
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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from adafruit_ble.services.nordic import UARTService
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from adafruit_bluefruit_connect.color_packet import ColorPacket
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from adafruit_bluefruit_connect.button_packet import ButtonPacket
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# setup for LED to indicate BLE connection
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blue_led = digitalio.DigitalInOut(board.BLUE_LED)
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blue_led.direction = digitalio.Direction.OUTPUT
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# setting up the buttons
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switch_pins = [board.D5, board.D6, board.D9, board.D10,
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board.D11, board.D12, board.D13, board.A0, board.A1, board.A2,
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board.A3, board.A4]
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switch_array = []
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# creating the button array
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for pin in switch_pins:
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switch_pin = digitalio.DigitalInOut(pin)
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switch_pin.direction = digitalio.Direction.INPUT
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switch_pin.pull = digitalio.Pull.UP
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switch_array.append(switch_pin)
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# states for button debouncing
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switch1_pressed = False
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switch2_pressed = False
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switch3_pressed = False
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switch4_pressed = False
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switch5_pressed = False
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switch6_pressed = False
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switch7_pressed = False
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switch8_pressed = False
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switch9_pressed = False
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switch10_pressed = False
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switch11_pressed = False
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switch12_pressed = False
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switches_pressed = [switch1_pressed, switch2_pressed, switch3_pressed, switch4_pressed,
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switch5_pressed, switch6_pressed, switch7_pressed, switch8_pressed,
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switch9_pressed, switch10_pressed, switch11_pressed, switch12_pressed]
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# colors from Animation library to send as color packets
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# named for notes
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color_C = color.RED
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color_Csharp = color.ORANGE
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color_D = color.YELLOW
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color_Dsharp = color.GREEN
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color_E = color.TEAL
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color_F = color.CYAN
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color_Fsharp = color.BLUE
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color_G = color.PURPLE
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color_Gsharp = color.MAGENTA
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color_A = color.GOLD
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color_Asharp = color.PINK
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color_B = color.WHITE
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# array for colors
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color = [color_C, color_Csharp, color_D, color_Dsharp, color_E,
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color_F, color_Fsharp, color_G, color_Gsharp, color_A,
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color_Asharp, color_B]
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# BLE send_packet function
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def send_packet(uart_connection_name, packet):
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"""Returns False if no longer connected."""
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try:
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uart_connection_name[UARTService].write(packet.to_bytes())
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except: # pylint: disable=bare-except
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try:
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uart_connection_name.disconnect()
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except: # pylint: disable=bare-except
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pass
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return False
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return True
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ble = BLERadio()
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uart_connection = None
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if ble.connected:
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for connection in ble.connections:
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if UARTService in connection:
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uart_connection = connection
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break
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while True:
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blue_led.value = False
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# BLE connection
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if not uart_connection or not uart_connection.connected: # If not connected...
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print("Scanning...")
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for adv in ble.start_scan(ProvideServicesAdvertisement, timeout=5): # Scan...
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if UARTService in adv.services: # If UARTService found...
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print("Found a UARTService advertisement.")
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blue_led.value = True # LED turns on when connected
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uart_connection = ble.connect(adv) # Create a UART connection...
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break
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ble.stop_scan() # And stop scanning.
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# while connected..
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while uart_connection and uart_connection.connected:
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# iterate through buttons and colors
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for switch_pin in switch_array:
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i = switch_array.index(switch_pin)
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switches_pressed_state = switches_pressed[i]
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colors = color[i]
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# if the button is released
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# worked best if placed before the button press portion
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if switch_pin.value and switches_pressed_state:
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print("button off")
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# send button packet to stop tone & color (happens on CPB)
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if not send_packet(uart_connection,
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ButtonPacket(ButtonPacket.RIGHT, pressed=True)):
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uart_connection = None
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continue
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switches_pressed[i] = False # Set to False.
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# time delay for BLE, otherwise issues can arrise
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time.sleep(0.05)
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# if button is pressed:
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if not switch_pin.value and not switches_pressed_state: # If button A pressed...
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# send color packet
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if not send_packet(uart_connection, ColorPacket(colors)):
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uart_connection = None
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continue
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switches_pressed[i] = True # Set to True.
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time.sleep(0.05) # Debounce.

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