Knightrider LED effect using Micropython

In this example we use LEDs connected to the following pins – 16,17,18,19,20,21,22,26,27,28 to create the knight rider effect

I tested this with cytron maker pi pico as it has LEDs connected to all the outputs

Schematic

If you want to build its fairly simple, you just need the pico, 10 LEDs and 10 resistors.

We forgot the resistor and led for pin 28

Parts

RP2040	Aliexpress
Electronics Components Basic Starter Kit	Aliexpress

Code

# Knight Rider LED
from machine import Pin
import utime

#LED Pins to be used
LEDs = [16,17,18,19,20,21,22,26,27,28]

#create an empty list to assing pins in pico
led_pins = []

for x in range(0,10):
    led_pins.append(Pin(LEDs[x], Pin.OUT, Pin.PULL_UP))
    
button_fast = Pin(11,Pin.IN, Pin.PULL_DOWN)
button_slow = Pin(13,Pin.IN, Pin.PULL_DOWN)

    
while True:
  # Left to Right #  
    for x in range(len(led_pins)-2):     
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x].value(1)
        utime.sleep(0.010)
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x+2].value(1)
        utime.sleep(0.010)
        led_pins[x].value(0)
        utime.sleep(0.010)
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x+2].value(0)
            
  # Left to Right #  
    for x in reversed(range(len(led_pins)-2)):   
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x].value(1)
        utime.sleep(0.010)
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x+2].value(1)
        utime.sleep(0.010)
        led_pins[x].value(0)
        utime.sleep(0.010)
        led_pins[x+1].value(1)
        utime.sleep(0.010)
        led_pins[x+2].value(0)

 

Video