/* //////////////////////////////////////////////////////////////////

  ARDUINO/Genuino Project "MADIMOD-77110", Environmental Monitoring
  https://www.changpuak.ch/electronics/Arduino-Madimod-77110-I2C.php
  Software Version 21.0
  25.07.2025 by ALEXANDER SSE FRANK

  The Serial Parser was written by Christian Monstein, used in
  "Easy_Diseqc V1.2", Monstein ETH Zurich, 20.06.2018

////////////////////////////////////////////////////////////////// */

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH1106.h>

// DISPLAY

#define OLED_MOSI  11
#define OLED_CLK   13
#define OLED_DC    9
#define OLED_CS    8
#define OLED_RESET 10

bool OLED_UPSIDE_DOWN = false ;

Adafruit_SH1106 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

#if (SH1106_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SH1106.h!");
#endif

int BeepPin = 5 ;

bool DEBUG = false ;

// SERIAL COMMUNICATION

String buffer ;



// /////////////////////////////////////////////////////////////////////
// SUBROUTINES SENSOR
// /////////////////////////////////////////////////////////////////////

float Messwert = 0.0 ;

byte error = 0x00 ;

void I2CScan()
{
byte error, address ;  
for(address = 1; address < 127; address++ )
  {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }
  }
}


void MEASURE()
{
  // THIS IS A PRESSURE MPL115A2 ////
  // START CONVERSION
  // EXTRA BRACKETS ARE NEEDED DUE TO DECLARATION 
  // OF VARIABLES INSIDE CASE STATEMENT
  unsigned int Padc_MSB = 0x00 ;
  unsigned int Padc_LSB = 0x00 ;
  unsigned int Tadc_MSB = 0x00 ;
  unsigned int Tadc_LSB = 0x00 ;
  unsigned int a0_MSB = 0x00 ;
  unsigned int a0_LSB = 0x00 ;
  unsigned int b1_MSB = 0x00 ;
  unsigned int b1_LSB = 0x00 ;
  unsigned int b2_MSB = 0x00 ;
  unsigned int b2_LSB = 0x00 ;
  unsigned int c12_MSB = 0x00 ;
  unsigned int c12_LSB = 0x00 ;
  Wire.beginTransmission(0x60);
  Wire.write(0x12); 
  Wire.write(0xAF);
  error = Wire.endTransmission(); 
  // WAIT FOR MEASUREMENT TO COMPLETE
  delay(5);  // max. 3 ms
  // READ ALL MEMORY LOCATIOSN
  Wire.beginTransmission(0x60);
  Wire.write(0x00); 
  Wire.endTransmission(); 
  Wire.requestFrom(0x60,12);
  if ( Wire.available() ) 
  {
  // READ MSB AND LSB
  Padc_MSB = Wire.read();      // 0x00
  Padc_LSB = Wire.read();      // 0x01
  Tadc_MSB = Wire.read();      // 0x02
  Tadc_LSB = Wire.read();      // 0x03
  a0_MSB = Wire.read();        // 0x04
  a0_LSB = Wire.read();        // 0x05
  b1_MSB = Wire.read();        // 0x06
  b1_LSB = Wire.read();        // 0x07
  b2_MSB = Wire.read();        // 0x08
  b2_LSB = Wire.read();        // 0x09
  c12_MSB = Wire.read();       // 0x0A
  c12_LSB = Wire.read();       // 0x0B
  }
  // COMBINE MSB AND LSB
  unsigned long Padc = ( ( Padc_MSB << 8 ) + Padc_LSB ) >> 6 ;          
  unsigned long Tadc = ( ( Tadc_MSB << 8 ) + Tadc_LSB ) >> 6 ;               
  float a0 = ( a0_MSB << 5 ) + ( a0_LSB >> 3 ) + ( a0_LSB & 0x07 ) / 8.0 ;         
  float b1 = ( ( ( ( b1_MSB & 0x1F ) * 0x100 ) + b1_LSB ) / 8192.0) - 3 ;
  float b2 = ( ( ( ( b2_MSB - 0x80 ) << 8 ) + b2_LSB ) / 16384.0 ) - 2 ;
  float c12 = ( ( ( c12_MSB * 0x100 ) + c12_LSB ) / 16777216.0 )  ;    
  // CALCULATE PRESSURE
  float Pcomp = a0 + ( b1 + c12 * Tadc ) * Padc + b2 * Tadc ;
  float PressurekPa = Pcomp * 0.0635 + 50 ;
  float PressuremBar = 10 * PressurekPa ;
  // Serial.println(error,DEC); // Serial.write(" mBar");Serial.write("\n");
  Messwert = PressuremBar ; // RESULT IS mbar
}


// /////////////////////////////////////////////////////////////////////
// SUBROUTINES DISPLAY.
// /////////////////////////////////////////////////////////////////////

void UpDateDisplay()
{
  display.clearDisplay() ;
  display.setTextSize(1) ;
  display.setTextColor(WHITE) ;
  display.setCursor(0, 0) ;
  display.println("MADIMOD-77110-I2C") ;
  display.drawLine(0, 12, 128, 12, WHITE) ;
  display.drawLine(0, 63, 128, 63, WHITE) ;
  display.setCursor(0, 25) ;
  display.setTextSize(3) ;
  if(Messwert < 1000.0) display.print(" ") ;
  display.print(Messwert,2) ;
  Serial.println(Messwert,2) ;
  display.display() ;
}
 
 
// /////////////////////////////////////////////////////////////////////
// SUBROUTINES BEEPER
// /////////////////////////////////////////////////////////////////////

const unsigned int BEEPlength = 99 ;

void BEEP(unsigned int data)
{
  unsigned int pointer = 0 ;
  for(int i=31; i>0; i--)
  {
    pointer = (1 << i) ;
    if((pointer & data) > 0) digitalWrite(BeepPin, HIGH) ;
    else digitalWrite(BeepPin, LOW) ;
    delay(BEEPlength) ;
  }
  digitalWrite(BeepPin, LOW) ; // JUST IN CASE :-)
}


// /////////////////////////////////////////////////////////////////////
// S E T U P
// /////////////////////////////////////////////////////////////////////

void setup() 
{
  // START SERIAL COMMUNICATIONS
  Serial.begin(115200) ;

  // START WIRE - I2C
  Wire.begin() ;
  
  // START OLED
  display.begin(SH1106_SWITCHCAPVCC);

  if(OLED_UPSIDE_DOWN) display.setRotation(2) ;   // 180 degrees

  // SHOW STARTUP SCREEN
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("MADIMOD-77110-I2C") ;
  display.drawLine(0, 12, 128, 12, WHITE) ;
  display.setTextSize(1) ;
  display.setCursor(0, 20) ;
  display.println("ARDUINO/GENUINO BASED") ;
  display.setCursor(0, 32) ;
  display.println("ENVIRONMENTAL MONITOR") ;
  display.setCursor(0, 44) ;
  display.println("(C) WWW.CHANGPUAK.CH") ;
  display.setCursor(0, 56) ;
  display.println("BUILT 05.12.2025") ;
  display.display() ;
  delay(999) ;

  // BEEPER BEGIN
  pinMode(BeepPin, OUTPUT) ;
  digitalWrite(BeepPin, HIGH) ;
  delay(999) ;
  digitalWrite(BeepPin, LOW) ;

  // CHECK SENSOR
  I2CScan() ;
}

// /////////////////////////////////////////////////////////////////////
// M A I N L O O P
// /////////////////////////////////////////////////////////////////////

void loop() 
{
  // /////////////////////////////////////////////////////////////////
  // CHECK SERIAL PORT
  if (Serial.available() > 0)
  // /////////////////////////////////////////////////////////////////
  {
    buffer = Serial.readString() ; 
    // ///////////////////////////////////////////////////////
    if (buffer.startsWith("*IDN?"))
    // ///////////////////////////////////////////////////////
    {
    Serial.println("MADIMOD-77110-I2C BY CHANGPUAK.CH") ;
    }  
    else
    // ///////////////////////////////////////////////////////
    if (buffer.startsWith("HELP"))
    // ///////////////////////////////////////////////////////
    {
    Serial.println("> HELP");
    Serial.println("RTFM.");             
    } 
    buffer = "" ;  // erase buffer for next command 
  }
  delay(9999) ;
  MEASURE() ;
  UpDateDisplay() ;
}

// /////////////////////////////////////////////////////////////
// END OF FILE.
// /////////////////////////////////////////////////////////////