Sensor Control rev_01

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    - Project: Sensor Control
    - Source Code NOT compiled for: Arduino Nano
    - Source Code created on: 2024-10-31 20:20:58

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* led auslesen über modbus */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <DHT.h>    // https://github.com/adafruit/DHT-sensor-library
#include <ArduinoModbus.h>  // https://github.com/arduino-libraries/ArduinoModbus
#include <ArduinoRS485.h> // Include ArduinoRS485 for Modbus RTU

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t dht22_DHT22_DOUT_PIN_D2 = 2; // DHT22 data pin
const int ledPin = LED_BUILTIN; // Define the LED pin

/***** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Initialize the DHT sensor object with the pin and type
DHT dht(dht22_DHT22_DOUT_PIN_D2, DHT22); // DHT22 is the type of sensor

// Initialize the Modbus RTU Client
ModbusRTUClient modbusRTUClient; // Create an instance of the Modbus RTU Client

void setup(void)
{
    // Start the serial communication at 9600 baud rate
    Serial.begin(9600);

    // Initialize the DHT sensor
    dht.begin();

    // Set the DHT pin as input with pull-up resistor
    pinMode(dht22_DHT22_DOUT_PIN_D2, INPUT_PULLUP);

    // Set the LED pin as output
    pinMode(ledPin, OUTPUT);

    // Start the Modbus RTU client with a baud rate of 9600
    if (!modbusRTUClient.begin(9600)) {
        Serial.println(F("Failed to start Modbus RTU Client!"));
        while (1); // Halt the program if the client fails to start
    }
}

void loop(void)
{
    // Delay to allow sensor to stabilize
    delay(2000); // Wait a few seconds between measurements

    // Read temperature as Celsius
    float temperature = dht.readTemperature();
    if (isnan(temperature)) {
        Serial.println(F("Error reading temperature!"));
    } else {
        Serial.print(F("Temperature: "));
        Serial.print(temperature);
        Serial.println(F("°C"));
    }

    // Read humidity
    float humidity = dht.readHumidity();
    if (isnan(humidity)) {
        Serial.println(F("Error reading humidity!"));
    } else {
        Serial.print(F("Humidity: "));
        Serial.print(humidity);
        Serial.println(F("%"));
    }

    // Read the LED state via Modbus
    if (modbusRTUClient.coilRead(0x00)) { // Assuming coil address 0x00 is used for the LED
        digitalWrite(ledPin, HIGH); // Turn on the LED if the coil is set
    } else {
        digitalWrite(ledPin, LOW); // Turn off the LED if the coil is not set
    }
}