inverter.ino

#include <SPI.h>


const int relayPin = D3;
const int btnPlus = D8;
const int btnMinus = D7;
const int btnBack = D6;
const int btnEnter = D5;

float time = 5.00;
int roundTime = 0;
int plusState = 0;
int minusState = 0;
int backState = 0;
int enterState = 0;

void setup()   {
  Serial.begin(115200);

  pinMode(btnPlus, OUTPUT);
  pinMode(btnMinus, OUTPUT);
  pinMode(btnBack, OUTPUT);
  pinMode(btnEnter, OUTPUT);
  pinMode(relayPin, OUTPUT);   
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)
  // init done

  // Show image buffer on the display hardware.
  // internally, this will display the splashscreen.
  display.display();
  delay(2000);

  // Clear the buffer.
  display.clearDisplay();
}

void loop() {
   // text display tests
  digitalWrite(relayPin, LOW);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Inverter");
  display.println("time:");
  display.setTextSize(2);
  roundTime = round(time);
  display.print(" ");
  display.println(roundTime);
  display.println(" mins"); 
  display.display();
  delay(100);
  display.clearDisplay();
  plusState = digitalRead(btnPlus);
  minusState = digitalRead(btnMinus);
  backState = digitalRead(btnBack);
  enterState = digitalRead(btnEnter);
    
  if (plusState == HIGH){time = time + 1;} 
  if (minusState == HIGH){if (time == 0) {} else {time = time - 1;} } 
  if (enterState == HIGH){inverter();} 
}

void inverter(void) {
  while(time > 0) {
    digitalWrite(relayPin, HIGH);
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(BLACK, WHITE); // 'inverted' text
    display.setCursor(0,0);
    display.println("Inverter  ");
    display.println("time left:");
    display.setTextSize(2);
    display.print(" ");
    roundTime = round(time);
    display.print(roundTime); 
    if (roundTime < 100) { display.print(" ");}
    if (roundTime < 10) { display.print(" ");}
    display.println("  mins "); 
    display.display();
    delay(1000);
    time = time - 0.016;
    backState = digitalRead(btnBack);    
    
    if (backState == HIGH) {
      time = 5;
      digitalWrite(relayPin, LOW);
      break; } 
    }
  digitalWrite(relayPin, LOW);
  time = 0;
  finished();
  }

void finished(void) {
  while (1 == 1) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(8,20);
  display.println("TIMES UP"); 
  display.display();
  backState = digitalRead(btnBack);    
  delay(100);
  if (backState == HIGH) {
    break; } 
  }
  }