If, else not completing loop

Projects Programming
1

I have an Arduino UNO that I am trying to make simple if statements code to read two conditions but my loop fails recognize the second condition. Why is my code not sensing analog in 4 and basically just halts?
I have attached my code, wiring diagram and flow chart. Any guidance with this project will be much appreciated. I am a notice at programming code.
I have attached a picture of my flow chart and wiring diagram.
You can see my code listed below:

int light;
int volt;

void setup() {
pinMode(13, OUTPUT); // put your setup code here, to run once:
pinMode(7, OUTPUT);
Serial.begin(9600);
}

void loop() {
light = analogRead(A0); // put your main code here, to run repeatedly:
volt = analogRead (A4);

if(light<700){
digitalWrite(13, HIGH); // LED on:
digitalWrite(7, HIGH); // Relay on:
}else{
digitalWrite(13, LOW); //LED off:
digitalWrite(7, HIGH);
if (light>700){
digitalWrite(13, LOW);
delay(900000); // 15 minute delay:
}else{
digitalWrite(13, HIGH);
if(volt<500){
digitalWrite(13, HIGH);
digitalWrite(7, HIGH);
}else{
digitalWrite(7, LOW);
delay(14400000); // 4hr delay for battery recharge:
if (volt>500){
digitalWrite(7, LOW);
digitalWrite(13, LOW);
}else{
digitalWrite(7, HIGH);
}
}
}
}

Serial.println(light);
delay(100);
}

Flowchart.jpg
Flowchart.jpg1254×773 90.8 KB

2

Made some changes.

To be tested:

int light;
int volt;

void setup()
{
  pinMode(13, OUTPUT);  // put your setup code here, to run once:
  pinMode(7, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  light = analogRead(A0);  // put your main code here, to run repeatedly:
  volt = analogRead (A4);

  //*********************
  if (light < 700)
  {
    digitalWrite(13, HIGH); // LED on:
    digitalWrite(7, HIGH);  // Relay on:
  }
  
  else 
  {
    digitalWrite(13, LOW);  //LED off:
    digitalWrite(7, HIGH);
  }

  //*********************
  if (light > 700)
  {
    digitalWrite(13, LOW);
    delay(900000);          //15 minute delay:
  }
  
  else
  {
    digitalWrite(13, HIGH);
  }

  //*********************
  if (volt < 500)
  {
    digitalWrite(13, HIGH);
    digitalWrite(7, HIGH);
  }
  
  else
  {
    digitalWrite(7, LOW);
    delay(14400000);         //4hr delay for battery recharge:
  }

  //*********************
  if (volt > 500)
  {
    digitalWrite(7, LOW);
    digitalWrite(13, LOW);
  }
  
  else
  {
    digitalWrite(7, HIGH);
  }

  //*********************
  Serial.println(light);
  delay(100);
  
} //END of loop()

Did you know that delay() stops normal code execution for the delay amount of time ?

3

It works!
Thank you for sharing your expert coding skills.
I spent two evenings trying to make it work.
Larryd, you made my day!

Thanks,