/*
HC-SR04 Ultrasonic Distance Sensor with 7 Segment Display
NTC Temperature Sensor
PushButton to switch displays
  + communication module (optional)
*/
#include <SevSeg.h>

#define TRIG_PIN A3
#define ECHO_PIN A4
#define MAX_DIST 300
#define TEMP_PIN A7
#define BTN_1 A6
#define BETA 3950
#define SOUND_VELOCITY 0.034321 / 2 // 0.03313  //for 0 st. C

SevSeg sevseg;

uint16_t duration = 0;
uint32_t interval = 0;

float distance = 0;
float procent;
int tempAnalog;
float temperature;
int btn = 0;
int btn_status;

void setup()
{
  //Serial.begin(115200); // Starts the serial communication
  uint8_t numDigits = 4;
  // DIG1, DIG2, DIG3, DIG4
  uint8_t digitPins[] = {2, 3, 4, 5};
  // A, B, C, D, E, F, G, DP
  uint8_t segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
  uint8_t displayType = COMMON_ANODE; // (Common Anode or Common Cathode)

  bool resistorsOnSegments = false;
  bool updateWithDelays = false;
  bool leadingZeros = false;
  bool disableDecPoint = false;

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(TEMP_PIN, INPUT);
  pinMode(BTN_1, INPUT_PULLUP);

  sevseg.begin(displayType, numDigits, digitPins, segmentPins, resistorsOnSegments,
               updateWithDelays, leadingZeros, disableDecPoint);
  sevseg.setBrightness(90);
}

void loop()
{
  if ((millis() - interval) >= 100) {
    interval = millis();

    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(5);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    // Read time of the trig and echo pins
    duration = pulseIn(ECHO_PIN, HIGH);

    tempAnalog = analogRead(TEMP_PIN);
    temperature = 1 / (log(1 / (1023. / tempAnalog - 1)) / BETA + 1.0 / 298.15) - 273.15;
 
    // Calculates the distance
    //distance = (duration / 2) / 29;
    distance = duration * SOUND_VELOCITY;

    // Calculate reverse % so if distance is high
    // procentage is low
    procent = (1-(distance/MAX_DIST))*100;
    if ( procent < 0 ) { procent = -1; }

    btn_status = analogRead(BTN_1);
      if (btn_status == 0 && btn == 0){
        btn = 15;
      }
    if (btn > 0) {
        sevseg.setNumberF(temperature,1);
        btn = btn -1;
    }else{
        sevseg.setNumber(procent);
        btn = 0;
    }
      //Serial.println("Distance (cm): " + String(distance) );
      //Serial.println("Temperature: " + String(temperature) );
  }

  sevseg.refreshDisplay();

}