/*
    Why the heart icon? Because I thought it was cool
    and I want to use it in the future with some heartbeat sensor.
    I needed to keep it somewhere and it was here. ;)
*/


#include <TinyWireM.h>
#include <Tiny4kOLED.h>



const unsigned char  img_heart_small[] PROGMEM = {
  0x00, 0x00, 0xc0, 0xe0, 0xe0, 0xe0, 0xc0, 0x80, 0x80, 0x80, 0xc0, 0xe0, 0xe0, 0xe0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01, 0x00, 0x00, 0x00
};

const unsigned char  img_heart_big[] PROGMEM = {
  0xe0, 0xf0, 0xf8, 0xf8, 0xf8, 0xf8, 0xf0, 0xe0, 0xe0, 0xe0, 0xf0, 0xf8, 0xf8, 0xf8, 0xf8, 0xf0, 0xe0, 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01, 0x00
};

const unsigned char  img_thermometer[] PROGMEM = {
  0x00, 0xfe, 0x03, 0xfe, 0x50,
  0x00, 0xff, 0x00, 0xff, 0x55,
  0x60, 0x9f, 0x80, 0x9f, 0x65,
};

//================================================================================================
void splash() {
  oled.clear();
  oled.setCursor(1, 0);
  oled.print(F("  ATtiny85 SSD1306"));

  oled.setCursor(1, 1);
  oled.print(F(" Low Voltage Cutoff"));

  oled.setCursor(35, 7);
  //oled.print(F("wokwi.com"));
}
//================================================================================================
void heartBeat() {
  static char big = 1;
  static long startTime = 0;
  long currentTime;

  // Get current time
  currentTime = millis();

  // Update if 200ms passed
  if ((currentTime - startTime) > 200) {
    startTime = currentTime;
    big = 1 - big;

    if (big) {
      oled.bitmap(20, 4, 37, 6, img_heart_big);
    } else {
      oled.bitmap(20, 4, 37, 6, img_heart_small);
    }
  }
}
//================================================================================================
void prepareDisplay() {

  unsigned int i, k;
  unsigned char ch[5];

  oled.clear();
  oled.begin();

  oled.setCursor(1, 0);
  oled.print(F("temperature"));
  oled.setCursor(75, 0);
  oled.print(F("24.0C"));

  oled.setCursor(3, 1);
  oled.print(F("voltage"));
  oled.setCursor(75, 1);
  oled.print(F("40.0"));

  oled.setCursor(3, 2);
  oled.print(F("cutoff"));
  oled.setCursor(75, 1);
  oled.print(F("40.0"));

  //oled.bitmap(105, 4, 110, 7, img_thermometer);
  //oled.setCursor(57, 4);
  //oled.print(F("24.0C"));
  //oled.setCursor(57, 5);
  //oled.print(F("40.0%"));

  //oled.bitmap(10, 5, 17, 2, img_heart_small);
}
//================================================================================================

int cutoffVoltage = 320;
#define enableVoltage  50


int sensorValue = 1; //initial value to see it has the value 1 or another read value
int sensorValue2 = 1; //initial value to see it has the value 1 or another read value
int sensorValue3 = 1; //initial value to see it has the value 1 or another read value

void setup() {
  pinMode(5, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(1, OUTPUT);

  oled.begin(128, 32, sizeof(tiny4koled_init_128x64br), tiny4koled_init_128x64br);

  // Two fonts are supplied with this library, FONT8X16 and FONT6X8
  oled.setFont(FONT6X8);

  // To clear all the memory
  oled.clear();
  oled.on();

  splash();

  delay(3000);
  prepareDisplay();
}
//================================================================================================
void loop() {
  static long startTime = 0;
  long currentTime;

  sensorValue = map(analogRead(0), 953, 115, -24, 80); //Read P5
  sensorValue2 = map(analogRead(3), 0, 1023, 0, 500); //Read P5
  cutoffVoltage = map(analogRead(2), 0, 1023, 0, 500); //Read P5

  // Get current time
  currentTime = millis();

  // Checks 1 second passed
  if ((currentTime - startTime) > 1000) {
    if (sensorValue2 > enableVoltage+cutoffVoltage) {
      digitalWrite(1, true);
    }
    if (sensorValue2 < cutoffVoltage) {
      digitalWrite(1, false);
    }
    startTime = currentTime;

    // Update temperature
    float temperature = sensorValue;

    // Set cursor
    oled.setCursor(75, 0);

    // Print to display
    oled.print(temperature, 0);
    oled.print(F("c  "));

    // Update humidity
    float humidity = sensorValue2 / 100.00;

    // Set cursor
    oled.setCursor(75, 1);
    // Print to display
    oled.print(humidity, 2);
    oled.print(F("v  "));

    //oled.bitmap(105, 4, 110, 7, img_thermometer);
  }

  float cutoff = cutoffVoltage / 100.00;

  // Set cursor
  oled.setCursor(75, 2);
  // Print to display
  oled.print(cutoff) / 100.0;
  oled.print(F("v  "));


  //heartBeat();
}
//================================================================================================