Two Words rev_01

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    - Project: Two Words
    - Source Code NOT compiled for: Arduino Nano 33 BLE
    - Source Code created on: 2025-06-20 08:50:20

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Implement a system that reads digital inputs from */
    /* the PCF8575 I/O expander and analog signals from */
    /* the ADS1115 ADC, then processes and displays the */
    /* data on the Arduino Nano 33 BLE. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <PCF8575.h>
#include <DFRobot_ADS1115.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF I2C PINS *****/
const uint8_t ioexpander_PCF8575_I2C_PIN_SDA_A4 = A4;
const uint8_t ioexpander_PCF8575_I2C_PIN_SCL_A5 = A5;
const uint8_t ioexpander_PCF8575_I2C_SLAVE_ADDRESS = 32;
const uint8_t adc_ADS1115_I2C_PIN_SDA_A4 = A4;
const uint8_t adc_ADS1115_I2C_PIN_SCL_A5 = A5;
const uint8_t adc_ADS1115_I2C_SLAVE_ADDRESS = 72;

/****** LIBRARY CLASS INSTANCES *****/
PCF8575 pcf8575(ioexpander_PCF8575_I2C_SLAVE_ADDRESS, &Wire);
DFRobot_ADS1115 ads(&Wire);

void setup(void)
{
  // Initialize serial communication for debugging
  Serial.begin(9600);
  while (!Serial);

  // Initialize I2C communication
  Wire.begin();

  // Initialize PCF8575 I/O expander
  if (pcf8575.begin()) {
    Serial.println("PCF8575 initialized successfully");
  } else {
    Serial.println("PCF8575 initialization failed");
  }

  // Initialize ADS1115 ADC
  ads.setAddr_ADS1115(adc_ADS1115_I2C_SLAVE_ADDRESS);
  ads.init();

  if (ads.checkADS1115()) {
    Serial.println("ADS1115 initialized successfully");
  } else {
    Serial.println("ADS1115 initialization failed");
  }
}

void loop(void)
{
  // Read digital inputs from PCF8575
  uint16_t digitalInputs = pcf8575.read16();

  // Read analog voltage from ADS1115 channel 0
  uint16_t adcValue = ads.readVoltage(0);
  float voltage = adcValue * 0.1875 / 1000; // Convert to millivolts

  // Display the digital inputs
  Serial.print("Digital Inputs (PCF8575): 0x");
  Serial.println(digitalInputs, HEX);

  // Display the analog voltage
  Serial.print("Analog Voltage (ADS1115 CH0): ");
  Serial.print(voltage, 3);
  Serial.println(" V");

  delay(1000); // Wait for 1 second before next reading
}

/* END CODE */