Low Power Arduino

// https://github.com/rocketscream/Low-Power





#include <LowPower.h>                                //the library for the low power
#include <Wire.h>                                    //i2c library for display
#include <Adafruit_SSD1306.h>                        //adafruit display library

#define OLED_RESET 4                                  //required by the adafruit library
Adafruit_SSD1306 display(OLED_RESET);                 //set up the display

void setup() {
  Serial.begin(9600);                                 //serial comms for debugging
  pinMode(13,OUTPUT);                                 //set built in LED for output

digitalWrite(13,LOW);                                 //turn off LED

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);          //start the display
  display.display();                                  //display the buffer data

  display.clearDisplay();                             //clear the display

}

void loop() {

  digitalWrite(13,HIGH);                              //turn on led
  display.setTextSize(2);                             //setup data for display
  display.setTextColor(WHITE);                        //setup data for display
  display.setCursor(0,0);                             //setup data for display
  display.clearDisplay();                             //setup data for display
  display.println("Arduino:- I am going for a Nap");  //put nap message in buffer
  display.display();                                  //display the buffer data

  delay(2000);                                        //have a quick smoke
  digitalWrite(13,LOW);                               //turn LED off


  LowPower.idle(SLEEP_8S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF,
                 SPI_OFF, USART0_OFF, TWI_OFF);                               //sleepy time

  display.clearDisplay();                             //setup data for display
  display.setCursor(0,0);                             //setup data for display
  display.println("Arduino:- Hey I just Woke up");    //put wake up message in buffer
  Serial.println("");
  display.display();                                  //display buffer data
  delay(2000);                                        //finish that smoke

}