/* This program is free software: you can redistribute it and/or modify it under
    the terms of the GNU General Public License as published by the Free Software
    Foundation, either version 3 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along with this program.
    If not, see <http://www.gnu.org/licenses/>.
    Copyright 2020,CEREBRUM srl

    More details by CEREBRUM Srl
    www.cerebrum.it
    ITALY

    Please consider that this application, sensors and functional device are NOT tested for
    medical purpose and the single parts aren't calibrated and aren't certified.
    Please use this simple device for preventive scope and to monitorate patients only under
    emergency situation when no other medical deviced and Pulse-oximeters are available.

    CEREBRUM-oximeter dev. 2.4 - version 1.1   // April, 6 2020

    Arduino NANO - 3,3v | i2c A4 (SDA) , A5 (SCL)
    Arduino NANO Every - 3,3v | i2c A4 (SDA) , A5 (SCL)
    Arduino MICRO - 3,3v | i2c 2 (SDA), 3 (SCL)

    MAX30100 - PulseOximeter board (+3.3v | GND | SCA/SCL)
    OLED SSD1306 128x32 (+3.3v | GND | SCA/SCL)

   Retrofitted  by Emanuel Cesar  ( DvalleyElectronics ) for Português ( Brasil ) settings , and increased a ( Bip - Sound ) for  increase the Monitoring of the ( BPM ).

   Tks  for " CEREBRUM (IT)  " ... and  enjoy it ( Oximeter - DvalleyElectronics - May, 20 2020 ).


*/

#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include "MAX30100.h"
#include <U8g2lib.h>

#define REPORTING_PERIOD_MS      1000
#define PULSE_WIDTH              MAX30100_SPC_PW_1600US_16BITS
#define IR_LED_CURRENT           MAX30100_LED_CURR_40MA
#define LED_CURRENT              MAX30100_LED_CURR_20_8MA
#define SAMPLING_RATE            MAX30100_SAMPRATE_100HZ

U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0);
PulseOximeter pox;
MAX30100 sensor;

uint32_t tsLastReport = 0;
uint32_t last_beat = 0;
bool initialized = false;
int HRclean;
int SpO2;

void onBeatDetected()
{
  show_beat();
  tone (8,1000,250);
  last_beat = millis();
}

void show_beat()
{
  u8g2.setFont(u8g2_font_cursor_tr);
  u8g2.setCursor(118, 10);
  u8g2.print("_");
  u8g2.sendBuffer();
}

void initial_display()
{
  if (not initialized)
  {
    u8g2.clearBuffer();
    u8g2.setCursor(0, 12);
    u8g2.setFont(u8g2_font_crox2hb_tr);
    u8g2.print("DvalleyElectronics");
    u8g2.setFont(u8g2_font_crox2h_tr);
    u8g2.setCursor(30, 29);
    u8g2.print("Oximetro");
    u8g2.sendBuffer();
    delay(3000);

    initialized = true;

    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_crox2hb_tr);
    if (!pox.begin()) {
      u8g2.setCursor(35, 12);
      u8g2.print("FALHOU");
      u8g2.setCursor(01, 29);
      u8g2.print("Cheque o Sensor !");
      u8g2.sendBuffer();
      for (;;);
    } else {
      u8g2.setCursor(12, 12);
      u8g2.print("INICIALIZADO");
      u8g2.setCursor(0, 29);
      u8g2.print("Toque no Sensor...");
      u8g2.sendBuffer();
    }
    delay(2000);
  }
}

void setup()
{
  u8g2.begin();
  initial_display();
  pox.begin();

  pox.setOnBeatDetectedCallback(onBeatDetected);
  pox.setIRLedCurrent(LED_CURRENT);
  sensor.setMode(MAX30100_MODE_SPO2_HR);
  sensor.setLedsPulseWidth(PULSE_WIDTH);
  sensor.setSamplingRate(SAMPLING_RATE);
  
}

void loop()
{
  pox.update();
  HRclean = pox.getHeartRate();
  SpO2 = pox.getSpO2();
  if ((millis() - tsLastReport > REPORTING_PERIOD_MS) and (HRclean > 30 and HRclean<220 and SpO2>30 and SpO2 < 100)) {
    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_crox2h_tr);
    u8g2.setCursor(8, 12);
    u8g2.print("F.C.");
    u8g2.setCursor(75, 12);
    u8g2.print("Bpm");
    u8g2.setCursor(1, 30);
    u8g2.print("SpO2 ");
    u8g2.setCursor(75, 30);
    u8g2.print("%");
    u8g2.setFont(u8g2_font_fub11_tf);
    u8g2.setCursor(45, 12);
    u8g2.print(HRclean);
    u8g2.setCursor(45, 30);
    u8g2.print(SpO2);
    u8g2.setFont(u8g2_font_cursor_tr);
    u8g2.setCursor(118, 10);
    u8g2.print("^");
    u8g2.sendBuffer();

    tsLastReport = millis();
  }
}