Neopixel grid

NeoPixel WS2812B 8×8 Grid

Wiring:

Power note: 64 LEDs at full white draw ~3.8A. For testing, keep brightness low (max ~50 per channel). For full brightness, use an external 5V power supply rated at 4A or more. Always connect GND of the external supply to the ESP32's GND.

Pixel numbering: Pixels are numbered 0–63, left-to-right, top-to-bottom:

 0  1  2  3  4  5  6  7   ← Row 0 (top)
 8  9 10 11 12 13 14 15   ← Row 1
16 17 18 19 20 21 22 23   ← Row 2
...
56 57 58 59 60 61 62 63   ← Row 7 (bottom)

Formula: index = row * 8 + col

Code:

import machine
import neopixel

pin = machine.Pin(6, machine.Pin.OUT)
np = neopixel.NeoPixel(pin, 64)

def clear():
    for i in range(64):
        np[i] = (0, 0, 0)
    np.write()

def set_pixel(row, col, r, g, b):
    np[row * 8 + col] = (r, g, b)

def render():
    np.write()

# Example: light up top-left corner
clear()
set_pixel(0, 0, 255, 0, 0)   # Red at row 0, col 0
render()

Did you know? Each WS2812B LED in your grid contains its own tiny control chip. The data signal is passed from LED to LED in a chain — that's why you only need one data wire for all 64 LEDs.