M5Atom Lite + PWM Kit + Fader Unit Z-gauge train model driver

M5Zcon.ino

#include "M5Atom.h"
#include "FastLED.h"
#include "pixeltypes.h"

// Fader Unit connected to Grove port of M5Atom Lite
#define NUM_LEDS_FADER 14
#define DATA_PIN_FADER 26
#define INPUT_PINS 32
// Define the array of leds
CRGB leds[NUM_LEDS_FADER];
uint8_t brightness = 70;
uint16_t rawADC = 0;

// ATOM PWM Kit
#define SIGNAL 22
int freq = 500;
int ledChannel1 = 0;
int resolution = 8;

void setup() {
  M5.begin(true, false, false); // Serial enable only
  Serial.begin(115200);

  // Fader set color 
  FastLED.addLeds<NEOPIXEL, DATA_PIN_FADER>(leds, NUM_LEDS_FADER);
  delay(1000);
  fill_gradient_RGB(leds, 0, CRGB::Red, 6, CRGB::Blue); 
  fill_gradient_RGB(leds, 7, CRGB::Blue, 13, CRGB::Red); 

  // PWM setup
  ledcSetup(ledChannel1, freq, resolution);
  ledcAttachPin(SIGNAL, ledChannel1);
}

void loop() {
  // get Fader input, set brightness 
  rawADC = analogRead(INPUT_PINS); // Read ADC value
  brightness = map(rawADC, 0, 4095, 0, 128); // Map ADC value to LED brightness: set maximum to half brightness
  FastLED.setBrightness(brightness); //Adjust the brightness of the FADER LED
  FastLED.show();

  // set PWM duty by fader input
  uint32_t duty = map(rawADC, 0, 4095, 0, pow(2,resolution-3)); // Map ADC value to PWM duty: set maximum to 1/8: If input is 12V, max volume indicates 1.5V.
  Serial.printf("rawADC: %d, Duty: %d\n", rawADC, duty);

  ledcWrite(ledChannel1, duty);
  delay(2);
}