syntax and logic port, untested

3D_Printed_Bionic_Eye/3D_Printed_Bionic_Eye.py

@@ -1,24 +1,49 @@
-# Laser Dog Goggles
-# https://learn.adafruit.com/laser-dog-goggles
+# Bionic Eye sketch for Adafruit Trinket.
+#
+# written by Bill Earl for Arduino 
+# ported to CircuitPython by Mikey Sklar
+# for Adafruit Industries
+#
+# Required library is the Adafruit_SoftServo library
+# available at https://github.com/adafruit/Adafruit_SoftServo
+# The standard Arduino IDE servo library will not work with 8 bit
+# AVR microcontrollers like Trinket and Gemma due to differences
+# in available timer hardware and programming. We simply refresh
+# by piggy-backing on the timer0 millis() counter
+#
+# Trinket:        Bat+    Gnd       Pin #0  Pin #1
+# Connection:     Servo+  Servo-    Tilt    Rotate
+#                 (Red)   (Brown)   Servo   Servo
+#                                   (Orange)(Orange)
 
 import time
+import random
 import board
 import pulseio
 from adafruit_motor import servo
 
-# servo pin for the M0 boards:
-pwm = pulseio.PWMOut(board.A2, duty_cycle=2 ** 15, frequency=50)
-my_servo = servo.Servo(pwm)
-speed = .04     # 40ms lower value means faster movement
-max_turn = 180  # rotation range 180 degree, half a circle
+# we are intentionally avoiding Trinket Pin #1 (board.A0) 
+# as it does not have PWM capability
+tilt_servo_pin = board.A2   # servo control line (orange) Trinket Pin #0
+rotate_servo_pin = board.A1 # servo control line (orange) Trinket Pin #2
+
+# servo object setup for the M0 boards:
+tilt_pwm = pulseio.PWMOut(tilt_servo_pin, duty_cycle=2 ** 15, frequency=50)
+rotate_pwm = pulseio.PWMOut(rotate_servo_pin, duty_cycle=2 ** 15, frequency=50)
+tilt_servo = servo.Servo(tilt_pwm)
+rotate_servo = servo.Servo(rotate_pwm)
+
+# servo timing and angle range
+speed = .04         # 40ms lower value means faster movement
+tilt_min = 120      # lower limit to tilt rotation range
+max_rotate = 180    # rotation range limited to half circle 
 
 while True:
-    # move stepper max_turn degrees clockwise
-    for angle in range(0, max_turn, 1):
-        my_servo.angle = angle
-        time.sleep(speed)
 
-    # move stepper max_turn degrees counter clockwise
-    for angle in range(max_turn, 0, -1):
-        my_servo.angle = angle
-        time.sleep(speed)
+    # servo tilt - on average move every 500ms
+    if random.randint(100) > 80:
+        tilt_servo = angle(random.randint(tilt_min, max_rotate))
+
+    # servo rotate - on average move every 500ms
+    if random.randint(100) > 90:
+        rotate_servo = (random.randint(0, max_rotate)