2.LED Strip

Description¶

UNIHIKER is equipped with a microcontroller responsible for controlling onboard components and GPIO. This project uses the PinPong library of Python to control a NeoPixel LED externally connected through side pins of the board. We will use an external light strips to achieve red, orange, yellow, green, blue, and purple colors.

Common functions¶

1.1 NeoPixel(Pin( ), )¶

Syntax	Object = NeoPixel(Pin(NEOPIXEL_PIN), PIXELS_NUM)
Description	Define the initialization function for the light strip.
Parameters	NEOPIXEL_PIN: User defined LED strip occupying pins.
	PIXELS_NUM: Users can choose the number of light beads they want to turn on.
Return	**None

1.2 brightness( )¶

Syntax	Object.brightness(value)
Description	Set the brightness of the light.
Parameters	value:The brightness of the lamp.
Return	The level that varies over time.

1.3 LED Color¶

Syntax	Object[num] = (R,G,B)
Description	Set the color of the light.
Parameters	num: The number of the lamp.
	R, G, B: The numerical values of the three primary colors required for the mixing of light beads.
Return	Color that changes with the function.

1.4 range_color( )¶

Syntax	Object.range_color(num.start,num.end,color)
Description	Set a range of LED lights on.
Parameters	num.start, num.end: The range within which the light bulb is illuminated.
	color: The color of the light bead is displayed in hexadecimal.
Return	The level that changes with the range.

1.5 shift( )¶

Syntax	Object.shift(num)
Description	Turn off the light beads in sequence. When the last light moves, the last light goes out.
Parameters	num:The number of light beads turned off each time.
Return	The level that varies over time.

1.6 rotate( )¶

Syntax	Object.rotate(num)
Description	Cycle lighting of LED beads. When the last position of the light moves, the last position of the light moves to the first position, and the cyclic movement is suitable for creating a rotating halo.
Parameters	num:The number of beads per cycle.
Return	The level that varies over time.

1.7 rainbow( )¶

Syntax	Object.rainbow(LEDs,LED number,beginHue,color)
Description	Control the light strip to display rainbow colors. Set a light strip as a gradient color, with a range of values as shown in the table below:
Parameters	LEDs:The LED type.
	LED number: The number of LED.
	beginHue: Initial color tone value.
	color: Lamp bead color.
Return	**None

Example Description¶

In this example, the UNIHIKER is first initialized with Board().begin(). Then, we use NEOPIXEL_PIN = Pin.P21 to initialize the pin. To define the number of lights, we use PIXELS_NUM = 7. Finally, we use np = NeoPixel(Pin(NEOPIXEL_PIN), PIXELS_NUM) to initialize the NeoPixel. In the main loop, we use the np[0] = (0, 255 ,0) function to change the color of the lights. We can also use the np.rainbow(0,7,0,0x0022FF) function to display a rainbow pattern. To achieve the desired results, two loops can be used to change the color of the lights and to turn them off sequentially.

Hardware Required¶

Example Code¶

# -*- coding: utf-8 -*-

# Experimental effect: Control WS2812 single line RGB LED light
# Wiring: Use a Windows or Linux computer to connect a UNIHIKER, and connect the ws2812 light to the p21 port
import time
from pinpong.board import Board,Pin,NeoPixel

NEOPIXEL_PIN = Pin.P21
PIXELS_NUM = 7  # number of lights

Board("UNIHIKER").begin()  # Initialize, select board type, do not input board type for automatic recognition

np = NeoPixel(Pin(NEOPIXEL_PIN), PIXELS_NUM)

while True:
  np[0] = (0, 255 ,0)  # Set the RGB color of the first light
  np[1] = (255, 0, 0)  # Set the RGB color of the second light
  np[2] = (0, 0, 255)  # Set the RGB color of the third light
  np[3] = (255, 0, 255)  # Set the RGB color of the forth light
  np[4] = (255, 255, 0)  # Set the RGB color of the fifth light
  np[5] = (0, 255, 255)  # Set the RGB color of the sixth light
  np[6] = (255, 255, 255) # Set the RGB color of the seventh light
  time.sleep(1)

  np.rainbow(0,7,0,0x0022FF)  # Display the light strip in the form of a rainbow
  time.sleep(1)

  for i in range(7):
    np.rotate(1)  # Cycle to change the color of the light a beads
    time.sleep(1)

  for i in range(7):
    np.shift(1)  # Turn off the light beads in sequence
    time.sleep(1)

  np.clear()

Program Effect: