1  import time
 2  
 3  from board import SCL, SDA
 4  import busio
 5  
 6  # Import the PCA9685 module. Available in the bundle and here:
 7  #   https://github.com/adafruit/Adafruit_CircuitPython_PCA9685
 8  from adafruit_pca9685 import PCA9685
 9  
10  from adafruit_motor import servo
11  
12  i2c = busio.I2C(SCL, SDA)
13  
14  # Create a simple PCA9685 class instance.
15  pca = PCA9685(i2c)
16  # You can optionally provide a finer tuned reference clock speed to improve the accuracy of the
17  # timing pulses. This calibration will be specific to each board and its environment. See the
18  # calibration.py example in the PCA9685 driver.
19  # pca = PCA9685(i2c, reference_clock_speed=25630710)
20  pca.frequency = 50
21  
22  # The pulse range is 750 - 2250 by default.
23  servo7 = servo.ContinuousServo(pca.channels[7])
24  # If your servo doesn't stop once the script is finished you may need to tune the
25  # reference_clock_speed above or the min_pulse and max_pulse timings below.
26  # servo7 = servo.ContinuousServo(pca.channels[7], min_pulse=750, max_pulse=2250)
27  
28  print("Forwards")
29  servo7.throttle = 1
30  time.sleep(1)
31  
32  print("Backwards")
33  servo7.throttle = -1
34  time.sleep(1)
35  
36  print("Stop")
37  servo7.throttle = 0
38  
39  pca.deinit()