Init fork from Stuart Robinson's repo

examples/Hardware_Checks/ESP32/51_DeepSleep_Switch_Wakeup_ESP32/51_DeepSleep_Switch_Wakeup_ESP32.ino

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+/*******************************************************************************************************
+  Programs for Arduino - Copyright of the author Stuart Robinson - 20/02/20
+
+  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 deep_sleep. Pressing BOOT switch should wake up the ESP32 from sleep.
+
+  Only the specific RTC IO pins can be used as a source for external wakeup.
+  These are pins: 0,2,4,12-15,25-27,32-39.
+
+  Current in deep_sleep for a bare bones ESP32 with regulator and no other devices was 27uA.
+
+  Serial monitor baud rate is set at 9600.
+*******************************************************************************************************/
+
+#define LED1 2                              //pin number for LED
+#define SWITCH1 0                           //pin number wakeup switch
+
+
+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);
+
+  esp_sleep_enable_ext0_wakeup(GPIO_NUM_0, 0);      //wakeup on pin GPIO0 going low
+
+  Serial.println(F("Start Sleep"));
+  Serial.flush();
+  sleepcount++;
+  esp_deep_sleep_start();
+  Serial.println();
+  Serial.println();
+  Serial.println(F("Awake ?"));                     //should not really see this, deep sleep wakeup causes reset ....
+}
+
+
+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();
+  Serial.println();
+  Serial.println(F("51_DeepSleep_Timed_Wakeup_ESP32 - Starting"));
+
+  if (bootCount == 0) //Run this only the first time
+  {
+    bootCount = bootCount + 1;
+  }
+
+  pinMode(LED1, OUTPUT);                      //for PCB LED
+  pinMode(SWITCH1, INPUT_PULLUP);             //for wakeup switch
+
+}