Merge pull request #2230 from jedgarpark/flying-fader

first commit flying fader demo

Author: TheKitty

Flying_Fader/code.py

@@ -0,0 +1,123 @@
+# SPDX-FileCopyrightText: 2022 John Park for Adafruit Industries
+# SPDX-License-Identifier: MIT
+# Motorized fader demo
+
+import time
+import board
+import pwmio
+import analogio
+import touchio
+import neopixel
+from digitalio import DigitalInOut, Pull
+from adafruit_debouncer import Debouncer
+from adafruit_motor import motor
+
+MIDI_DEMO = False
+
+# optional MIDI setup
+if MIDI_DEMO:
+    import usb_midi
+    import adafruit_midi
+    from adafruit_midi.control_change import ControlChange
+    midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0)
+    fader_cc_number = 16
+
+
+# Button setup to store four saved values
+button_pins = (board.D10, board.D9, board.D6, board.D5)
+buttons = []
+for button_pin in button_pins:
+    tmp_pin = DigitalInOut(button_pin)
+    tmp_pin.pull = Pull.UP
+    buttons.append(Debouncer(tmp_pin))
+
+saved_positions = (240, 180, 120, 40)  # pre-saved positions for the buttons to call
+
+# Slide pot setup
+fader = analogio.AnalogIn(board.A0)
+fader_position = fader.value  # ranges from 0-65535
+fader_pos = fader.value // 256  # make 0-255 range
+last_fader_pos = fader_pos
+
+
+# Motor setup
+PWM_PIN_A = board.D12  # pick any pwm pins on their own channels
+PWM_PIN_B = board.D11
+
+# DC motor driver setup -- these pins go to h-bridge driver such as L9110
+pwm_a = pwmio.PWMOut(PWM_PIN_A, frequency=50)
+pwm_b = pwmio.PWMOut(PWM_PIN_B, frequency=50)
+motor1 = motor.DCMotor(pwm_a, pwm_b)
+
+# Touch setup  pin goes from touch pin on slide pot to touch capable pin and then 1MΩ to gnd
+touch = touchio.TouchIn(board.A4)
+
+# NeoPixel setup
+led = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.2, auto_write=True)
+led.fill(0xff0000)
+
+def clamp(num, min_value, max_value):  # function for clamping motor throttle -1.0 to 1.0
+    return max(min(num, max_value), min_value)
+
+def go_to_position(new_position):
+
+    global fader_pos  # pylint: disable=global-statement
+    fader_pos = int(fader.value//256)
+    while abs(fader_pos - new_position) > 2 :
+        if fader_pos > new_position :
+            speed = 2.25 * abs(fader_pos - new_position) / 256 + 0.12
+            speed = clamp(speed, -1.0, 1.0)
+            motor1.throttle = speed
+            led[0] = (fader_pos, 0, 0)
+
+            if MIDI_DEMO:
+                global fader_cc  # pylint: disable=global-statement
+                fader_cc = int(fader_pos / 2)  # cc is 0-127
+                midi.send(ControlChange(fader_cc_number, fader_cc))
+
+        if fader_pos < new_position:
+            speed = -2.25 * abs(fader_pos - new_position) / 256 - 0.12
+            speed = clamp(speed, -1.0, 1.0)
+            motor1.throttle = speed
+            led[0] = (fader_pos, 0, 0)
+
+            if MIDI_DEMO:
+                fader_cc = int(fader_pos / 2)  # cc is 0-127
+                midi.send(ControlChange(fader_cc_number, fader_cc))
+
+        fader_pos = int(fader.value//256)
+    motor1.throttle = None
+print("--__ Flying Fader Demo __--")
+print("\n"*4)
+
+go_to_position(120)
+go_to_position(60)
+go_to_position(180)
+go_to_position(40)
+go_to_position(200)
+time.sleep(.6)
+
+current_saved_position = 0  # state to store which is current position from the list
+
+while True:
+    for i in range(len(buttons)):
+        buttons[i].update()
+        if buttons[i].fell:  # if a button is pressed, update the position from list
+            current_saved_position = i
+
+    if touch.value:
+        motor1.throttle = None  # idle
+    else:
+        go_to_position(saved_positions[current_saved_position])
+
+    filter_amt = 0.1  # higher number will be a slower filter between 1.0 and 0.1 is good
+    fader_pos = int((filter_amt * last_fader_pos) + ((1.0-filter_amt) * fader.value//256))
+    led[0] = (fader_pos, 0, 0)
+    if abs(fader_pos - last_fader_pos) > 1 :  # do things in here, e.g. send MIDI CC
+        fader_width = 90
+        print("-" * (fader_width - int(fader_pos/3)), fader_pos, "-" * int(fader_pos/3), end='\r')
+        last_fader_pos = fader_pos
+
+        if MIDI_DEMO:
+            fader_cc = int(fader_pos / 2)  # cc is 0-127
+            midi.send(ControlChange(fader_cc_number, fader_cc))