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Adding code files for BLE synth Learn Guide
Adding code files for the BLE synth project. One file is for the Feather nRF52840 and the other is for the Circuit Playground Bluefruit. They're named for clarity so that there aren't two code.py files- this is noted in the 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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