ported to CircuitPython

Adafruit_LED_Sequins/Adafruit_LED_Sequins.ino

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+int brightness = 0;    // how bright the LED is
+int fadeAmount = 5;    // how many points to fade the LED by
+int counter = 0;       // counter to keep track of cycles
+
+// the setup routine runs once when you press reset:
+void setup()  { 
+  // declare pins to be an outputs:
+  pinMode(0, OUTPUT);
+  pinMode(2, OUTPUT);
+} 
+
+// the loop routine runs over and over again forever:
+void loop()  { 
+  // set the brightness of the analog-connected LEDs:
+  analogWrite(0, brightness);
+  
+  // change the brightness for next time through the loop:
+  brightness = brightness + fadeAmount;
+
+  // reverse the direction of the fading at the ends of the fade: 
+  if (brightness == 0 || brightness == 255) {
+    fadeAmount = -fadeAmount; 
+    counter++;
+  }     
+  // wait for 15 milliseconds to see the dimming effect    
+  delay(15); 
+
+// turns on the other LEDs every four times through the fade by 
+// checking the modulo of the counter.
+// the modulo function gives you the remainder of 
+// the division of two numbers:
+  if (counter % 4 == 0) {
+    digitalWrite(2, HIGH);
+  } else {
+   digitalWrite(2, LOW);
+  }  
+}

Adafruit_LED_Sequins/Adafruit_LED_Sequins.py

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+import board
+import pulseio
+import time
+from digitalio import DigitalInOut, Direction
+
+# PWM (fading) LEDs are connected on D0 (PWM not avail on D1)
+pwm_leds = board.D0     
+pwm = pulseio.PWMOut(pwm_leds, frequency=1000, duty_cycle=0)
+
+# digital LEDs connected on D2
+digital_leds = DigitalInOut(board.D2)
+digital_leds.direction = Direction.OUTPUT
+
+brightness = 0          # how bright the LED is
+fade_amount = 1285      # 2% steping of 2^16
+counter = 0             # counter to keep track of cycles
+
+while True:
+
+    # And send to LED as PWM level
+    pwm.duty_cycle = brightness     
+
+    # change the brightness for next time through the loop:
+    brightness = brightness + fade_amount
+
+    print(brightness)
+
+    # reverse the direction of the fading at the ends of the fade:
+    if ( brightness <= 0 ):
+        fade_amount = -fade_amount
+        counter += 1
+    elif ( brightness >= 65535 ):
+        fade_amount = -fade_amount
+        counter += 1
+
+    # wait for 15 ms to see the dimming effect
+    time.sleep(.015)
+
+    # turns on the other LEDs every four times through the fade by
+    # checking the modulo of the counter.
+    # the modulo function gives you the remainder of
+    # the division of two numbers:
+    if ( counter % 4 == 0 ):
+        digital_leds.value = True    
+    else:
+        digital_leds.value = False

Adafruit_LED_Sequins/README.md

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+# Adafruit_LED_Sequins
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/adafruit-led-sequins/