Have Fun with M5Stack Unit NeoHEX
27 Mar 2025
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Today we want to do something simple, so I choose the M5Stack Unit NeoHEX. It's a newbie-friendly product. Let's do it now.
I'd like to use M5Stack ATOM Lite be a micro controller, this is a tiny ESP32 Pico chip product, includes 4MB SPI flash memory, it also have WiFi on board, so we can connect to our home assistant system in easy way.
Connect
First of all, we use the Grove cable Connect ATOM Lite and NeoHEX together like this:
After that, we connect ATOM Lite and our computer.
If you don't know how to upload code into M5Stack, check these articles first:
Code
Open your Arduino IDE. Don't know how to use Arduino IDE? Check this:
Libraries we need:
-
Include libraries
#include <M5Atom.h>
#include "FastLED.h"
-
Define hardware
#define Neopixel_PIN_26 26
#define Neopixel_PIN_32 32
#define NUM_LEDS 37
-
Brightness
CRGB leds[NUM_LEDS];
int brightness = 128; //50% light, 0-255
-
Setup
void setup() {
M5.begin(true, false, true); // Initialize M5Atom without Serial, I2C and LED
M5.dis.drawpix(0, CRGB::Black); // Turn off the onboard LED
// Initialize LEDs on both pins
FastLED.addLeds<WS2811, Neopixel_PIN_26, GRB>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
FastLED.addLeds<WS2811, Neopixel_PIN_32, GRB>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
FastLED.setBrightness(64);
}
-
Loop
void loop() {
// Define the arrow pattern for your custom layout
int arrowPattern[37] = {
0, 0, 0, 0, // Row 1: 4 LEDs
0, 0, 0, 1, 0, // Row 2: 5 LEDs
0, 0, 0, 0, 1, 0, // Row 3: 6 LEDs
0, 1, 1, 1, 1, 1, 0, // Row 4: 7 LEDs
0, 0, 0, 0, 1, 0, // Row 5: 6 LEDs
0, 0, 0, 1, 0, // Row 6: 5 LEDs
0, 0, 0, 0 // Row 7: 4 LEDs
};
for (int i = 0; i < NUM_LEDS; i++) {
if (arrowPattern[i] == 1) {
leds[i] = CRGB::Red; // Set LED to red
} else {
leds[i] = CRGB::Blac
k; // Turn off LED
}
}
FastLED.show();
delay(500); // Keep the arrow displayed
}
Results
It worked, a red arrow.
Upgrade
Pattern
Look at this part in the code:
void loop() {
// Define the arrow pattern for your custom layout
int arrowPattern[37] = {
0, 0, 0, 0, // Row 1: 4 LEDs
0, 0, 0, 1, 0, // Row 2: 5 LEDs
0, 0, 0, 0, 1, 0, // Row 3: 6 LEDs
0, 1, 1, 1, 1, 1, 0, // Row 4: 7 LEDs
0, 0, 0, 0, 1, 0, // Row 5: 6 LEDs
0, 0, 0, 1, 0, // Row 6: 5 LEDs
0, 0, 0, 0 // Row 7: 4 LEDs
};
Replace 0 with 1 to make your own patten
Color
Look at this part:
for (int i = 0; i < NUM_LEDS; i++) {
if (arrowPattern[i] == 1) {
leds[i] = CRGB::Red; // Set LED to red
} else {
leds[i] = CRGB::Black; // Turn off LED
}
}
Change your favorite color
If you want RGB color, use this code:
for (int i = 0; i < NUM_LEDS; i++) {
if (arrowPattern[i] == 1) {
leds[i] = CHSV((millis() / 10) + (i * 10), 255, brightness); // RGB color based on time
} else {
leds[i] = CRGB::Black; // Turn off LED
}
}
It looks like this:
So much fun, get your own NeoHEX right now, hurry up!
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