Problem with applying sleep mode and wake up to solar tracker using LDR code

[mjnewbee]

Good day, Ms. and Mr.,

I am using an Arduino R3 board with ATMEGA 328P microcontroller.
I am new to this forum and I would like to seek help. I have used a code that uses 2 push buttons. 1 button is for sleep mode, and the other is for wake-up. I wish to know how to connect the wake-up sequence to the main code so that the machine would start again.

int topleft;
int topright;
int downleft;
int downright;
int waittime = 1;
#include "Arduino.h"
#include <avr/sleep.h>

#define sleepPin 8  // When low, makes 328P go to sleep
#define wakePin 3   // when low, makes 328P wake up, must be an interrupt pin (2 or 3 on ATMEGA328P)

void setup() {
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  TCCR1A = 0;
  TCCR1A = (1 << COM1A1) | (1 << COM1B1) | (1 << WGM11);
  TCCR1B = 0;
  TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS11);
  ICR1 = 40000;
  OCR1A = 4000;
  OCR1B = 4750;
    Serial.begin(9600);

  // Keep pins high until we ground them
  pinMode(sleepPin, INPUT_PULLUP);
  pinMode(wakePin, INPUT_PULLUP);

  Serial.println("Setup completed.");
}

void loop() {
  topleft = analogRead(A0);
  topright = analogRead(A1);
  downleft = analogRead(A2);
  downright = analogRead(A3);

  if (topleft > topright) {
    OCR1A = OCR1A + 1;
    delay(waittime);
  }
  if (downleft > downright) {
    OCR1A = OCR1A + 1;
    delay(waittime);
  }
  if (topleft < topright) {
    OCR1A = OCR1A - 1;
    delay(waittime);
  }
  if (downleft < downright) {
    OCR1A = OCR1A - 1;
    delay(waittime);
  }
  if (OCR1A > 4000) {
    OCR1A = 4000;
  }
  if (OCR1A < 2000) {
    OCR1A = 2000;
  }
  if (topleft > downleft) {
    OCR1B = OCR1B - 1;
    delay(waittime);
  }
  if (topright > downright) {
    OCR1B = OCR1B - 1;
    delay(waittime);
  }
  if (topleft < downleft) {
    OCR1B = OCR1B + 1;
    delay(waittime);
  }
  if (topright < downright) {
    OCR1B = OCR1B + 1;
    delay(waittime);
  }
  if (OCR1B > 4200) {
    OCR1B = 4200;
  }
  if (OCR1B < 3000) {
    OCR1B = 3000;
  }
    // Is the "go to sleep" pin now LOW?
  if (digitalRead(sleepPin) == LOW) {

    // Disable the ADC (Analog to digital converter, pins A0 [14] to A5 [19])
    static byte prevADCSRA = ADCSRA;
    ADCSRA = 0;

    */
    set_sleep_mode (SLEEP_MODE_PWR_DOWN);
    sleep_enable();

    MCUCR = bit (BODS) | bit (BODSE);

    // The BODS bit is automatically cleared after three clock cycles so we better get on with it
    MCUCR = bit (BODS);

    
    noInterrupts();
    attachInterrupt(digitalPinToInterrupt(wakePin), sleepISR, LOW);

    // Send a message just to show we are about to sleep
    Serial.println("Good night!");
    Serial.flush();

    // Allow interrupts now
    interrupts();

    // And enter sleep mode as set above
    sleep_cpu();

    // --------------------------------------------------------
    // µController is now asleep until woken up by an interrupt
    // --------------------------------------------------------

    // Wakes up at this point when wakePin is brought LOW - interrupt routine is run first
    Serial.println("I'm awake!");

    // Re-enable ADC if it was previously running
    ADCSRA = prevADCSRA;
  }
}

// When wakePin is brought LOW this interrupt is triggered FIRST (even in PWR_DOWN sleep)
void sleepISR() {
  // Prevent sleep mode, so we don't enter it again, except deliberately, by code
  sleep_disable();

  // Detach the interrupt that brought us out of sleep
  detachInterrupt(digitalPinToInterrupt(wakePin));


}

[J-M-L]

do you understand any of this code and what OCR1A, ADCSRA, MCUCR etc are for?

this code could be made way more simple to understand by using higher level functions provided by the Arduino IDE and the LowPower library