#include <Arduino.h>
#include "driver/adc.h"
#include "driver/ledc.h"

#define led1 21
#define led2 5
#define input1 ADC1_CHANNEL_6  // GPIO34
#define input2 ADC1_CHANNEL_7  // GPIO35

void setup() {
  Serial.begin(115200);

  // ADC
  adc1_config_width(ADC_WIDTH_BIT_12);
  adc1_config_channel_atten(input1, ADC_ATTEN_DB_11);
  adc1_config_channel_atten(input2, ADC_ATTEN_DB_11);

  // PWM Timer
  ledc_timer_config_t ledc_timer = {
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .duty_resolution = LEDC_TIMER_8_BIT,
    .timer_num = LEDC_TIMER_0,
    .freq_hz = 5000,
    .clk_cfg = LEDC_AUTO_CLK
  };
  ledc_timer_config(&ledc_timer);

  // PWM Channel LED1
  ledc_channel_config_t ch1 = {
    .gpio_num = led1,
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .channel = LEDC_CHANNEL_0,
    .timer_sel = LEDC_TIMER_0,
    .duty = 0,
    .hpoint = 0
  };
  ledc_channel_config(&ch1);

  // PWM Channel LED2
  ledc_channel_config_t ch2 = {
    .gpio_num = led2,
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .channel = LEDC_CHANNEL_1,
    .timer_sel = LEDC_TIMER_0,
    .duty = 0,
    .hpoint = 0
  };
  ledc_channel_config(&ch2);

  Serial.println("ESP32 Ready");
}

void loop() {
  int val1 = adc1_get_raw(input1);
  int val2 = adc1_get_raw(input2);

  int pwm1 = val1 * 255 / 4095;
  int pwm2 = val2 * 255 / 4095;

  ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, pwm1);
  ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);

  ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_1, pwm2);
  ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_1);

  Serial.printf("ADC1=%d PWM1=%d | ADC2=%d PWM2=%d\n",
                val1, pwm1, val2, pwm2);

  delay(100);
}