5. Embedded Programming¶

import time
from neopixel import Neopixel
pixels = Neopixel(17, 0, 6, "GRB")

colors = [
  (0xb6, 0xe4, 0x30),
  (0x42, 0xd1, 0xe0),
]

pixel_index = 0
color_index = 0
while True:
  pixels.set_pixel(pixel_index, colors[color_index])
  pixels.show()
  #print(pixel_index, colors[color_index])
  pixel_index += 1
  if pixel_index == 16:
    pixel_index = 0
    color_index = (color_index + 1) % 2
  time.sleep(0.1)

import time
from neopixel import Neopixel
pixels = Neopixel(17, 0, 6, "GRB")


colors = [
    (255, 0, 0),
    (0, 255, 0),
    (0, 0, 255),
    (0, 255, 255),
    (255, 0, 255),
    (255, 255, 0),
    (255, 255, 255),
    (236, 85, 158),
]


#the color for neopixel will accept rgb format

#https://learn.adafruit.com/adafruit-kb2040/neopixel-led
#https://www.w3schools.com/colors/colors_picker.asp?colorhex=E8B5CE (good color picker)

#botton
#https://docs.wokwi.com/parts/wokwi-pushbutton
#https://wokwi.com/projects/312696687190606401
#https://stackoverflow.com/questions/77995955/how-to-code-a-cycle-of-options-for-a-button-in-micropython


pixel_index = 0
color_index = 0



while True:
  pixels.set_pixel(pixel_index, colors[color_index])
  pixels.show()
  #print(pixel_index, colors[color_index])
  pixel_index += 1  #This alternates to ever other led
  if pixel_index == 16: #this is the number of leds in the strip
    pixel_index = 0
    #print(len(colors))
    color_index = (color_index + 1) % len(colors) #Maybe I could count the array for this. So I was able to have it measure the size of the index so if I add and remove colors that I don´t have to import it here.

  time.sleep(0.05) #this decides how fast this goes in the cycle

Me - I need to add a momentary button for on off control to this micro python code. The Pin for the button is 21.

GPT - Sure! Please share your MicroPython code, and I'll modify it to include a momentary button for on/off control using Pin 21.

Me - Gave it the original code that I modified from above.

GPT - I've added a momentary button on Pin 21 to control the on/off state of your NeoPixel cycle. The button toggles the LED animation each time it is pressed. Here's the updated code:

Micropython Button
Changes & Features:
Added a Button on Pin 21:

Configured as an input with an internal pull-up resistor.
Implemented Interrupt for Button Press:

Uses an interrupt (irq) to toggle the running state when the button is pressed.
Includes a debounce delay.
Toggles Animation On/Off:

If running is True, the NeoPixel animation continues.
If running is False, the animation pauses.
Let me know if you need any modifications!

Me - Can you make it an on off switch and the default state for the neopixels is off?

GPT - I've modified the code so that the NeoPixels start in an OFF state and act as an on/off switch when the button is pressed. If turned off, the pixels will be cleared. Let me know if you need further tweaks! 🚀

GPT Code - 
import time
from neopixel import Neopixel
from machine import Pin

pixels = Neopixel(17, 0, 6, "GRB")
button = Pin(21, Pin.IN, Pin.PULL_UP)  # Configure Pin 21 as input with pull-up resistor

colors = [
    (255, 0, 0),
    (0, 255, 0),
    (0, 0, 255),
    (0, 255, 255),
    (255, 0, 255),
    (255, 255, 0),
    (255, 255, 255),
    (236, 85, 158),
]

pixel_index = 0
color_index = 0
running = False  # Default state is OFF


def button_pressed(pin):
    global running
    time.sleep(0.1)  # Debounce delay
    if pin.value() == 0:
        running = not running  # Toggle the animation state
        if not running:
            pixels.clear()
            pixels.show()


button.irq(trigger=Pin.IRQ_FALLING, handler=button_pressed)  # Interrupt on button press

while True:
    if running:
        pixels.set_pixel(pixel_index, colors[color_index])
        pixels.show()
        pixel_index += 1
        if pixel_index == 16:
            pixel_index = 0
            color_index = (color_index + 1) % len(colors)
        time.sleep(0.15)