En los canales se usa el canal cero y el canal dos porque aparentemente los canales vienen en pares y si se usa el cero y el uno tendrán la misma frecuencia.
#define LEDC_TIMER_13_BIT 13
#define LEDC_BASE_FREQ_R1 40
#define LEDC_BASE_FREQ_R2 80
#define LED_PIN_1 15 // pin for first signal
#define LED_PIN_2 26 // pin for second signal
#define LEDC_CHANNEL_0 0
#define LEDC_CHANNEL_1 2
void setup() {
pinMode(LED_PIN_1, OUTPUT); // set pin as output
pinMode(LED_PIN_2, OUTPUT); // set pin as output
ledcAttachChannel(LED_PIN_1, LEDC_BASE_FREQ_R1, LEDC_TIMER_13_BIT, LEDC_CHANNEL_0 );
ledcAttachChannel(LED_PIN_2, LEDC_BASE_FREQ_R2, LEDC_TIMER_13_BIT, LEDC_CHANNEL_1 );
// Initiates PWM signals with a 50% duty cycle
ledcWrite(LED_PIN_1, 4096); // 50% of 2^13 = 4096
ledcWrite(LED_PIN_2, 4096); // 50% of 2^13 = 4096
}
void loop() {
// The loop is kept empty or with other commands as needed
}