Init fork from Stuart Robinson's repo

examples/Hardware_Checks/ESP32/50_LightSleep_Timed_Wakeup_ESP32/50_LightSleep_Timed_Wakeup_ESP32.ino

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+/*******************************************************************************************************
+  Programs for Arduino - Copyright of the author Stuart Robinson - 03/02/20
+
+  This program is supplied as is, it is up to the user of the program to decide if the program is
+  suitable for the intended purpose and free from errors.
+*******************************************************************************************************/
+/*
+
+****************************************************************************************************************
+  Program operation - The program flashes a LED connected to the pin defined by LED1, and puts the ESP32 to
+  light_sleep for a period determined by TIME_TO_SLEEP (in seconds).
+
+  The program also has the option of using a logic pin to control the power to the lora.SD card and DS18B20
+  devices, which can save power in sleep mode. If the hardware is fitted to your board these devices are
+  powered on by setting the VCCPOWER pin low. If your board does not have this feature set VCCPOWER to -1.
+
+  Current in light_sleep mode was 1500uA
+****************************************************************************************************************
+*/
+
+
+#define VCCPOWER 14                         //when low supplies VCC power to external devices. Set to -1 if not used
+#define LED1 2                              //On board LED, high for on
+
+
+#define uS_TO_S_FACTOR 1000000              //Conversion factor for micro seconds to seconds
+#define TIME_TO_SLEEP  15                   //Time ESP32 will go to sleep (in seconds) 
+
+RTC_DATA_ATTR int16_t bootCount = 0;
+RTC_DATA_ATTR uint16_t sleepcount = 0;
+
+
+void loop()
+{
+  Serial.print(F("Bootcount "));
+  Serial.println(bootCount);
+  Serial.print(F("Sleepcount "));
+  Serial.println(sleepcount);
+  Serial.println(F("LED Flash"));
+  led_Flash(4, 125);
+  Serial.println(F("LED On"));
+  digitalWrite(LED1, HIGH);
+  delay(2500);
+  Serial.println(F("LED Off"));
+  digitalWrite(LED1, LOW);
+
+  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
+  Serial.println(F("Start Sleep"));
+  Serial.flush();
+  sleepcount++;
+  esp_light_sleep_start();
+  Serial.println();
+  Serial.println();
+  Serial.println(F("Awake !"));
+}
+
+
+void led_Flash(unsigned int flashes, unsigned int delaymS)
+{
+  //flash LED to show tracker is alive
+  unsigned int index;
+
+  for (index = 1; index <= flashes; index++)
+  {
+    digitalWrite(LED1, LOW);
+    delay(delaymS);
+    digitalWrite(LED1, HIGH);
+    delay(delaymS);
+  }
+}
+
+
+void setup()
+{
+  Serial.begin(9600);                         //setup Serial console ouput
+  Serial.println(F("50_LightSleep_Timed_Wakeup_ESP32 - Starting"));
+
+  if (bootCount == 0) //Run this only the first time
+  {
+    bootCount = bootCount + 1;
+  }
+
+  pinMode(LED1, OUTPUT);                      //for PCB LED
+
+  if (VCCPOWER >= 0)
+  {
+    pinMode(VCCPOWER, OUTPUT);                  //For controlling power to external devices
+    digitalWrite(VCCPOWER, HIGH);               //VCCOUT off, lora device and SD card off
+  }
+
+}