#include <stdio.h>
#include "driver/ledc.h"
#include "esp_err.h"

#define SingleShotOutput 	2 
#define PWMchannel 		1

void IRAM_ATTR pwmstop()
{
  ledcWrite(PWMchannel, 0);
}

void setup() 
{
  ledcAttachPin(SingleShotOutput, PWMchannel);
  ledcSetup(PWMchannel, 10, 8); // 10 Hz PWM (100ms), 8-bit resolution
  attachInterrupt(digitalPinToInterrupt(SingleShotOutput), pwmstop, FALLING);
}

void loop() 
{
  ledcWrite(PWMchannel, 128); //50% duty cycle to achieve 50ms on-time
  delay(2000); // Wait a long time to restart the single pulse again
}