// STM32 Nucleo-C031C6 I2C Example
// Simulation: https://wokwi.com/projects/365421666018061313

#include "LiquidCrystal_I2C.h"
#include "stdio.h"

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, STM32!");

  lcd.init();
  lcd.backlight();

  lcd.setCursor(4, 0);
  lcd.print("Hello, STM32");
  lcd.setCursor(5, 2);
  lcd.print("Welcome to");
  lcd.setCursor(7, 3);
  lcd.print("Wokwi!");

  lcd.clear();
}

void loop() {
  int analog_data_0 = analogRead(A0); //read data from analog pin 0
  int analog_data_1 = analogRead(A1); //read data from analog pin 1

  int output_digital = analog_data_0 - analog_data_1; //digital data from ADC
  int output_digital_last = 0;

  //double output_voltage = 0.0;

  //In order to stop display from clearing itself when output is the same
  //I check if previous value is the same as new, if it is, ignore printing it
  while(1){ 
    analog_data_0 = analogRead(A0); 
    analog_data_1 = analogRead(A1); 
    output_digital = analog_data_0 - analog_data_1;
    //output_voltage = (output_digital*3.3)/1024; //convert to voltage
    Serial.print("Digital output: ");
    Serial.println(output_digital);

    // Serial.print("Voltage output: ");
    // Serial.println(output_voltage);

    if(output_digital_last != output_digital){
      lcd.clear();
      delay(100);
      lcd.print(output_digital);
    }
    output_digital_last = output_digital;
  }
}