/***************************************************
      Light string
    * ****************************************************
       Control an Light string on like a Breathing LED, repeatedly.

      @author Dongzi(1185787528@qq.com)
      @version  V1.0
      @date  2016-5-26
      All above must be included in any redistribution
    * ****************************************************/
int t;
#define  Light_string  3
void setup() {

  pinMode( Light_string, OUTPUT);
}
void loop() {

  for (t = 5; t < 255; t++ ) // turn the Light string on (HIGH is the voltage level) little and little.
  {
    analogWrite( Light_string, t);
    delay(10);
  }

  if (t >= 255)      // turn the Light string off (HIGH is the voltage level) little and little.
  {
    for (t == 255; t > 5; t--)
    {
      analogWrite( Light_string, t);
      delay(10);
    }
  }
}

#  -*- coding: UTF-8 -*-

# MindPlus
# Python
from pinpong.extension.unihiker import *
from pinpong.board import Board,Pin
from pinpong.board import Board
import time


Board().begin()
p_p21_pwm=Pin(Pin.P21, Pin.PWM)

while True:
    while not ((my_variable >= 1023)):
        my_variable = (my_variable + 1)
        p_p21_pwm.write_analog(my_variable)
        time.sleep(0.01)
    while not ((my_variable <= 0)):
        my_variable = (my_variable - 1)
        p_p21_pwm.write_analog(my_variable)
        time.sleep(0.01)