Merge pull request #2233 from jedgarpark/flying-fader

changed touch pin so it'll work on Feather RP2040 (was on A4, now on A3)

Author: TheKitty

Flying_Fader/code.py

@@ -1,7 +1,6 @@
 # SPDX-FileCopyrightText: 2022 John Park for Adafruit Industries
 # SPDX-License-Identifier: MIT
 # Motorized fader demo
-
 import time
 import board
 import pwmio
@@ -12,7 +11,7 @@
 from adafruit_debouncer import Debouncer
 from adafruit_motor import motor
 
-MIDI_DEMO = False
+MIDI_DEMO = False  # set to True to send MIDI CC
 
 # optional MIDI setup
 if MIDI_DEMO:
@@ -22,7 +21,6 @@
     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 = []
@@ -31,15 +29,14 @@
     tmp_pin.pull = Pull.UP
     buttons.append(Debouncer(tmp_pin))
 
-saved_positions = (240, 180, 120, 40)  # pre-saved positions for the buttons to call
+saved_positions = (230, 180, 120, 60)  # 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
@@ -50,7 +47,8 @@
 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)
+touch = touchio.TouchIn(board.A3)
+touch.threshold = touch.raw_value + 30  # tune for fader knob cap
 
 # NeoPixel setup
 led = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.2, auto_write=True)
@@ -60,7 +58,6 @@ def clamp(num, min_value, max_value):  # function for clamping motor throttle -1
     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 :
@@ -90,11 +87,8 @@ def go_to_position(new_position):
 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)
+go_to_position(saved_positions[3])  # boot up demo
+go_to_position(saved_positions[0])
 time.sleep(.6)
 
 current_saved_position = 0  # state to store which is current position from the list
@@ -114,10 +108,9 @@ def go_to_position(new_position):
     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
+        fader_width = 90  # for text visualization in serial output
         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))