Merge pull request #2203 from adafruit/cassette

adding code for the cassette guide

Author: TheKitty

Cassette_Player_Mod_L9110/code.py

@@ -0,0 +1,75 @@
+# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import pwmio
+import simpleio
+from adafruit_motor import motor
+from analogio import AnalogIn
+from digitalio import DigitalInOut, Direction, Pull
+
+#  button setup
+warble_switch = DigitalInOut(board.A0)
+warble_switch.direction = Direction.INPUT
+warble_switch.pull = Pull.UP
+#  potentiometer setup
+pot = AnalogIn(board.A1)
+
+#  PWM pins for L9110
+PWM_PIN_A = board.A3  # pick any pwm pins on their own channels
+PWM_PIN_B = board.A2
+#  PWM setup
+pwm_a = pwmio.PWMOut(PWM_PIN_A, frequency=50)
+pwm_b = pwmio.PWMOut(PWM_PIN_B, frequency=50)
+#  motor setup
+cassette = motor.DCMotor(pwm_a, pwm_b)
+
+#  variables for warble switch
+i = 0.4
+last_i = 0.4
+
+while True:
+    #  map range of pot to range of motor speed
+    #  all the way to the left will run the motor in reverse full speed
+    #  all the way to the right will run the motor forward full speed
+    mapped_speed = simpleio.map_range(pot.value, 0, 65535, -1.0, 1.0)
+    #  if you press the button...
+    #  creates a ramping effect
+    if not warble_switch.value:
+        #  checks current pot reading
+        #  if it's positive...
+        if mapped_speed > 0:
+            #  sets starting speed
+            i = 0.4
+            #  sets last value to loop
+            last_i = i
+            #  notes that it's positive
+            pos = True
+        #  if it's negative...
+        else:
+            #  sets starting speed
+            i = -0.4
+            #  sets last value to loop
+            last_i = i
+            #  notes that it's negative
+            neg = True
+        #  loop 8 times
+        for z in range(8):
+            #  if it's positive...
+            if pos:
+                #  increase speed
+                i += 0.06
+            #  if it's negative
+            else:
+                #  decrease speed
+                i -= 0.06
+            #  send value to motor
+            cassette.throttle = i
+            time.sleep(0.1)
+        #  loop the value while button is held down
+        i = last_i
+        pos = False
+        neg = False
+    #  run motor at mapped speed from the pot
+    cassette.throttle = mapped_speed