# Necrochasm Prop Maker Feather RP2040 Python Code # Written by Christopher Littlefield # "Is your Light bright enough to stand in full gaze of the Hive's abyss?" import board import analogio import digitalio import pwmio import time import random import neopixel import audiobusio import audiocore import audiomixer from adafruit_motor import motor from adafruit_debouncer import Debouncer max_ammo = 50 ammo = 0 rpm = 720 # The Necrochasm has two firing speeds: 720 and 900 rpm. # This value controls the timing of the code to make the prop's firing rate accurate. ammo_interval = 60 / rpm ammo_time = -3600 infinite_ammo = False infinite_ammo_timer = 5.0 # Desperation is an in-game feature where the Necrochasm's reload speed is temporailiy # increased to 900 RPM. In the prop, this is meant to be triggered by a button press, # then reloading the gun. desperation_ready = False desperation_activated = -3600.0 desperation_pressed = -3600.0 desperation_timer = 6.0 desperation_pin = digitalio.DigitalInOut(board.D12) desperation_pin.direction = digitalio.Direction.INPUT desperation_pin.switch_to_input(pull=digitalio.Pull.UP) desperation_button = Debouncer(desperation_pin) # The reload pin is grounded while the ammo cartridge is inserted into the prop. # If the pin is open, the cartridge has been removed. reload_pin = digitalio.DigitalInOut(board.D11) reload_pin.direction = digitalio.Direction.INPUT reload_pin.switch_to_input(pull=digitalio.Pull.UP) reload = Debouncer(reload_pin) trigger_pin = digitalio.DigitalInOut(board.EXTERNAL_BUTTON) trigger_pin.direction = digitalio.Direction.INPUT trigger_pin.switch_to_input(pull=digitalio.Pull.UP) trigger = Debouncer(trigger_pin) # This LED flashes in sync with the Necrochasm's firing rate. barrel_led = digitalio.DigitalInOut(board.D10) barrel_led.direction = digitalio.Direction.OUTPUT barrel_led.value = False rumble_a = pwmio.PWMOut(board.D24, frequency=50) rumble_b = pwmio.PWMOut(board.D25, frequency=50) rumble_motor = motor.DCMotor(rumble_a, rumble_b) throttle_motor = throttle720 = 0.17 throttle900 = 0.25 # Neopixel Indicies fiber_optics_indexA = 0 lower_flames_index = fiber_optics_indexA + 1 upper_flames_index = lower_flames_index + 13 targeting_light_index = upper_flames_index + 21 fiber_optics_indexB = targeting_light_index + 1 core_stripes_index = fiber_optics_indexB + 1 stripe_index = core_stripes_index + 3 core_index = stripe_index + 7 core_flames_index = core_index + 1 ridges_index = core_flames_index + 3 cartridge_index = ridges_index + 5 end_of_string = cartridge_index + 5 num_pixels = end_of_string + 1 # NOTE: "targeting_light_index" refers to a RGB LED, as opposed to the regular GRB leds. # So, switch red and green values when programming color. # Enable the external power pin so the addressable LEDS and sound can be used. enable = digitalio.DigitalInOut(board.EXTERNAL_POWER) enable.direction = digitalio.Direction.OUTPUT enable.value = True # These variables help measure the battery level of the Necrochasm. vbat_voltage = analogio.AnalogIn(board.A3) battery_voltage = 0.0 pixel = neopixel.NeoPixel(board.EXTERNAL_NEOPIXELS, num_pixels) pixel.brightness = 0.1 flame_start = 128 # Audio Related i2s = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA) fire_wav = necro720 = audiocore.WaveFile("sounds/Necro720.wav") necro900 = audiocore.WaveFile("sounds/Necro900.wav") headshot = audiocore.WaveFile("sounds/Headshot.wav") roar = audiocore.WaveFile("sounds/Roar.wav") # The reason for the mixer is in the event the headshot file is played over the # normal firing sound. mixer = audiomixer.Mixer(voice_count=2, sample_rate=necro720.sample_rate, channel_count=2, bits_per_sample=necro720.bits_per_sample, samples_signed=True) i2s.play(mixer) mixer.voice[0].level = 1 # voice 0 is used for firing the Necrochasm mixer.voice[1].level = 1 # voice 1 is used for playing the Headshot file def animate_flames(pixel_array, low, high): flame_increment = 40 flame_max_brightness = 255 for i in range(low, high): color = list(pixel_array[i]) # Neopixel colors are a tuple, so convert to list. # Pull Green value from index 1. color[1] += flame_increment if color[1] > flame_max_brightness: color[1] = random.randrange(0, int(flame_increment/2)) pixel_array[i] = (0, color[1], 0) def get_voltage(pin): return pin.value / 65535 * 3.3 * 2 # Startup Sequence if reload.value is False: ammo = max_ammo else: ammo = 0 battery_voltage = get_voltage(vbat_voltage) pixel[fiber_optics_indexA] = (0, 255, 0) for i in range(lower_flames_index, targeting_light_index): pixel[i] = (0, random.randrange(0, flame_start), 0) # Remember, we swap red and green at this index. pixel[targeting_light_index] = (255, 0, 0) for i in range(fiber_optics_indexB, core_flames_index): pixel[i] = (0, 255, 0) for i in range(core_flames_index, ridges_index): pixel[i] = (0, random.randrange(0, flame_start), 0) for i in range(ridges_index, end_of_string): pixel[i] = (0, 255, 0) while True: reload.update() desperation_button.update() trigger.update() #Battery Voltage Indicator battery_voltage = get_voltage(vbat_voltage) if battery_voltage > 3.8: pixel[stripe_index] = (0, 255, 0) else: pixel[stripe_index] = (0, 0, 0) if battery_voltage > 3.7: pixel[stripe_index+1] = (0, 255, 0) else: pixel[stripe_index+1] = (0, 0, 0) if battery_voltage > 3.6: pixel[stripe_index+2] = (0, 255, 0) else: pixel[stripe_index+2] = (0, 0, 0) if battery_voltage > 3.5: pixel[stripe_index+3] = (0, 255, 0) else: pixel[stripe_index+3] = (0, 0, 0) if battery_voltage > 3.4: pixel[stripe_index+4] = (0, 255, 0) else: pixel[stripe_index+4] = (0, 0, 0) if battery_voltage > 3.3: pixel[stripe_index+5] = (0, 255, 0) else: pixel[stripe_index+5] = (0, 0, 0) if battery_voltage > 3.2: pixel[stripe_index+6] = (0, 255, 0) else: pixel[stripe_index+6] = (0, 0, 0) if trigger.fell and ammo > 0: mixer.voice[0].play(fire_wav, loop=infinite_ammo ) rumble_motor.throttle = throttle_motor if trigger.rose or ammo <= 0: mixer.voice[0].stop() rumble_motor.throttle = 0 barrel_led.value = False for i in range(ridges_index, cartridge_index): pixel[i] = (0, 255, 0) if trigger.value is False and ammo > 0: if time.monotonic() > (ammo_time + (ammo_interval / 2)): if barrel_led.value is False: barrel_led.value = True for i in range(ridges_index, cartridge_index): pixel[i] = (0, 255, 0) ammo_time = time.monotonic() else: barrel_led.value = False for i in range(ridges_index, cartridge_index): pixel[i] = (0, 0, 0) ammo_time = time.monotonic() if infinite_ammo is False: ammo -= 1 if ammo > 25: topLED = (ammo - 25) * 10 pixel[cartridge_index] = pixel[cartridge_index + 2] = (0, 250, 0) pixel[cartridge_index + 1] = pixel[cartridge_index + 3] = (0, topLED, 0) else: pixel[cartridge_index] = pixel[cartridge_index + 2] = (0, ammo * 10, 0) pixel[cartridge_index + 1] = pixel[cartridge_index + 3] = (0, 0, 0) else: animate_flames(pixel, lower_flames_index, targeting_light_index) animate_flames(pixel, core_flames_index, ridges_index) if reload.fell: ammo = max_ammo for i in range(cartridge_index, cartridge_index + 4): pixel[i] = (0, 255, 0) if desperation_ready: desperation_activated = time.monotonic() rpm = 900 ammo_interval = 60 / rpm fire_wav = necro900 throttle_motor = throttle900 desperation_ready = False if reload.rose: ammo = 0 if desperation_button.fell: desperation_pressed = time.monotonic() if desperation_button.rose: if time.monotonic() > (desperation_pressed + infinite_ammo_timer): mixer.voice[1].play(roar, loop=False) infinite_ammo = not infinite_ammo ammo = max_ammo for i in range(cartridge_index, cartridge_index + 4): pixel[i] = (0, 255, 0) else: mixer.voice[1].play(headshot, loop=False) desperation_ready = True if time.monotonic() > (desperation_activated + desperation_timer) and rpm == 900: rpm = 720 ammo_interval = 60 / rpm fire_wav = necro720 throttle_motor = throttle720 if trigger.value is False: rumble_motor.throttle = throttle720 else: rumble_motor.throttle = 0 if mixer.voice[0].playing: mixer.voice[0].play(fire_wav, loop=True)