Merge pull request #1167 from kattni/blinka-pwm

Adding Blinka PWM code.

Author: kattni

CircuitPython_on_Linux_and_Raspberry_Pi/PWM_LED.py

@@ -0,0 +1,14 @@
+import time
+import board
+import pulseio
+
+led = pulseio.PWMOut(board.D16, frequency=5000, duty_cycle=0)
+
+while True:
+    for i in range(100):
+        # PWM LED up and down
+        if i < 50:
+            led.duty_cycle = int(i * 2 * 65535 / 100)  # Up
+        else:
+            led.duty_cycle = 65535 - int((i - 50) * 2 * 65535 / 100)  # Down
+        time.sleep(0.01)

CircuitPython_on_Linux_and_Raspberry_Pi/PWM_motor_servo_control.py

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+import time
+import board
+import pulseio
+from adafruit_motor import servo
+
+# create a PWMOut object on Pin D5.
+pwm = pulseio.PWMOut(board.D5, duty_cycle=2 ** 15,  frequency=50)
+
+# Create a servo object.
+servo = servo.Servo(pwm)
+
+while True:
+    for angle in range(0, 180, 5):  # 0 - 180 degrees, 5 degrees at a time.
+        servo.angle = angle
+        time.sleep(0.05)
+    for angle in range(180, 0, -5): # 180 - 0 degrees, 5 degrees at a time.
+        servo.angle = angle
+        time.sleep(0.05)

CircuitPython_on_Linux_and_Raspberry_Pi/PWM_servo_control.py

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+import time
+import board
+import pulseio
+
+# Initialize PWM output for the servo (on pin D5):
+servo = pulseio.PWMOut(board.D5, frequency=50)
+
+
+# Create a function to simplify setting PWM duty cycle for the servo:
+def servo_duty_cycle(pulse_ms, frequency=50):
+    period_ms = 1.0 / frequency * 1000.0
+    duty_cycle = int(pulse_ms / (period_ms / 65535.0))
+    return duty_cycle
+
+
+# Main loop will run forever moving between 1.0 and 2.0 mS long pulses:
+while True:
+    servo.duty_cycle = servo_duty_cycle(1.0)
+    time.sleep(1.0)
+    servo.duty_cycle = servo_duty_cycle(2.0)
+    time.sleep(1.0)