HW4: Soldering and Arduino Exercises

const int ledPin =  13;   // initializing the variables that won't change
const int ledIn = 7;
int state = 0;   // 0 = LED off and 1 = LED on
char ledState;
unsigned long previousMillis = 0;        // will store last time LED was updated


const long interval = 500;  
const long interval2 = 200; // interval at which to blink (milliseconds)

void setup() {
   // set the digital pin as output:
   pinMode(ledPin, OUTPUT);
   pinMode(ledIn, INPUT);
}

void loop() { // The following is an unneccessarily robust program, and is where I have my problems
  ledState = digitalRead(ledIn);
  unsigned long currentMillis = millis();
   if (ledState == LOW && state == 0){ // This is case #1, where the switch is not pressed and the led is off
     if (currentMillis - previousMillis >= interval) {
     // save the last time you blinked the LED
     previousMillis = currentMillis;
     }
     digitalWrite(ledPin, HIGH); // Turn LED from off to on, then proceed to the following if statement
     state = 1 - state;
   }
   else if (ledState == LOW && state == 1);{ // Still case #1, but now where the LED is on
     if (currentMillis - previousMillis >= interval) {
     // save the last time you blinked the LED
     previousMillis = currentMillis;
     }
     digitalWrite(ledPin, LOW); // Turn LED off for time "interval", then proceed to the first if statment if ledState remains "LOW"
     state = 1 - state;
   }
  if (ledState == HIGH && state == 0){ // This is case #2, where the switch is not pressed and the led is off
       if (currentMillis - previousMillis >= interval2) {
       // save the last time you blinked the LED
       previousMillis = currentMillis;
       
       digitalWrite(ledPin, HIGH);} // Turn the LED on now, then proceed to the following if statement
       state = 1 - state;
     }
     else if (ledState == HIGH && state == 1);{ // Still case #2, but now where the LED is on
       if (currentMillis - previousMillis >= interval2) {
       // save the last time you blinked the LED
       previousMillis = currentMillis;
       
       digitalWrite(ledPin, LOW);} // Turn the LED off after time interval2, then the previous if statement will be activated if ledState remains "HIGH"
       state = 1 - state;
     }
}