User: How would you code a pwm controlled fan in arduino IDE with an arduino nano
Assistant: 1. Connect a PWM-enabled fan to digital pin 9 on Arduino Nano.
2. Upload the following code:

```cpp
const int fanPin = 9;

void setup() {
  pinMode(fanPin, OUTPUT);
}

void loop() {
  analogWrite(fanPin, 255);  // Max speed
  delay(1000);
  analogWrite(fanPin, 128);  // Half speed
  delay(1000);
  analogWrite(fanPin, 64);   // Low speed
  delay(1000);
  analogWrite(fanPin, 0);    // Off
  delay(1000);
}
```

This code will make the fan run at four different speed levels with a 1-second interval between each level. You can modify the speed values and delays to achieve the desired speeds and running times.
User: How do I modify his code to be able to change the pwm values through arduino cloud over the phone app?
Assistant: To modify the code so that you can change the PWM values through Arduino Cloud and control the fan using a phone app, you'll need to follow these steps:

1. **Set Up Arduino IoT Cloud:**
   - Create an account on [Arduino Cloud](https://cloud.arduino.cc/if you haven't already).
   - Create a new thing and select the device (your Arduino Nano).
   - Define a new variable, say `fanSpeed`, of type `int` and set it to be `read & write`. Ensure it's linked to the correct device.

2. **Modify Code for Cloud Connectivity:**
   - Use an Arduino board with internet capabilities directly (like the Arduino Nano 33 IoT) or pair your Arduino Nano with an external Wi-Fi module (esp8266/esp32). For simplicity, the example below assumes a board like the Nano 33 IoT with built-in Wi-Fi.
   - Install required libraries: Open the Arduino IDE, go to Sketch -> Include Library -> Manage Libraries, and install `"Arduino IoT Cloud"`, `"Arduino_ConnectionHandler"`, and `"ArduinoJson"`.
   - Update the sketch with your network credentials and the cloud setup:

```cpp
#include <ArduinoIoTCloud.h>
#include <Arduino_ConnectionHandler.h>

const int fanPin = 9;
int fanSpeed = 0;  // Variable to store the fan speed (0-255)

// WiFi network details
const char SSID[] = "your_network_name";
const char PASS[] = "your_network_password";

void setup() {
  Serial.begin(9600);
  pinMode(fanPin, OUTPUT);

  // Configure IoT Cloud credentials
  ArduinoCloud.setThingId("YOUR_THING_ID");
  ArduinoCloud.setWiFiConnection(SSID, PASS);
  ArduinoCloud.setDebug(false);

  // Link your cloud variable to a local variable
  ArduinoCloud.addProperty(fanSpeed, READWRITE, ON_CHANGE, onFanSpeedChange);

  // Connect to the Arduino IoT Cloud
  ArduinoCloud.begin();
}

void loop() {
  ArduinoCloud.update();
  analogWrite(fanPin, fanSpeed);
}

// Function gets called every time fanSpeed changes
void onFanSpeedChange() {
  Serial.print("Fan Speed changed to: ");
  Serial.println(fanSpeed);
}
```

3. **Deploy to the Board:**
   - Update the `YOUR_THING_ID` placeholder with the Thing ID from the Arduino IoT Cloud.
   - Connect your Arduino board to your computer.
   - Select the correct board type and port in the Arduino IDE.
   - Upload the sketch to your Arduino board.

4. **Use Arduino IoT Cloud Dashboard:**
   - Create a new dashboard on Arduino IoT Cloud.
   - Add a new widget to control `fanSpeed`, such as a slider that ranges from 0 to 255.
   - Link the widget to the `fanSpeed` variable.

5. **Control via Phone App:**
   - Install the Arduino IoT Cloud app on your smartphone.
   - Log in with your Arduino account.
   - Open your dashboard and adjust the `fanSpeed` slider to change the fan speed in real-time.

This setup allows you to remotely control the fan speed from a mobile application through the Arduino IoT Cloud. Ensure you have stable Wi-Fi access for seamless operation.
User: When I try the code above I get the error "Compilation error: 'class ArduinoIoTCloudTCP' has no member named 'setWiFiConnection'; did you mean 'getConnection'?"
Assistant: It looks like there has been an update to the Arduino IoT Cloud libraries since the code I initially provided was created. Let’s fix this error by using the correct method of setting up the WiFi connection with the revised library functions.

Here's a modified version of your code to address the error:

1. **Include the Necessary Headers and Libraries:**
   Make sure you have the correct libraries installed. You need `ArduinoIoTCloud` and `WiFiNINA`. 

2. **Set Up the Cloud and Device:**
   Update the sketch to correctly handle the WiFi connection.

Here's the corrected example code:

```cpp
#include <ArduinoIoTCloud.h>
#include <WiFiConnectionManager.h>
#include <WiFiNINA.h>

const int fanPin = 9;
int fanSpeed = 0;  // Variable to store the fan speed (0-255)

// WiFi network details
const char SSID[] = "your_network_name";
const char PASS[] = "your_network_password";

void setup() {
  Serial.begin(9600);
  pinMode(fanPin, OUTPUT);

  // Configure IoT Cloud properties
  ArduinoCloud.setThingId("YOUR_THING_ID");
  ArduinoCloud.addProperty(fanSpeed, READWRITE, ON_CHANGE, onFanSpeedChange);

  // Set up the WiFi connection
  WiFiConnectionHandler wifi(SSID, PASS);

  // Connect to the Arduino IoT Cloud
  ArduinoCloud.begin(wifi);
}

void loop() {
  ArduinoCloud.update();
  analogWrite(fanPin, fanSpeed);
}

// Function gets called whenever fanSpeed changes
void onFanSpeedChange() {
  Serial.print("Fan Speed changed to: ");
  Serial.println(fanSpeed);
}
```

### Key Modifications:

- Removed the `ArduinoIoTCloudTCP` method call that was not valid (`setWiFiConnection`).
- Added the `WiFiConnectionHandler` to manage the WiFi setup.
- Used `ArduinoCloud.begin()` with a `wifi` object created from `WiFiConnectionHandler`.

### Additional Steps:

- Make sure you replace `"YOUR_THING_ID"` with the actual Thing ID from your Arduino Cloud dashboard.
- Check that your device in the Arduino IoT Cloud has the correct Thing properties and that they're mapped correctly in your dashboard widget.
- Verify your WiFi credentials and ensure you are within the network range.
- Ensure that the correct board is selected in the Arduino IDE.

This setup with `WiFiConnectionHandler` should now match the updated library API, correcting any discrepancies and allowing you to connect your device to the Arduino IoT Cloud properly.
User: how would I write an if case for these 3 variables to set them to 0 if their result is nan(not a number) "  for (int i = 0; i < 2; i++) {
  //Read data and store it to variables hum and temp
  hum[i] = dht[i].readHumidity();
  temp[i] = dht[i].readTemperature();
  tempF[i] = dht[i].convertCtoF(temp[i]);

  
  }"
Assistant: To handle cases where the readings from the DHT sensor might return `NaN` (Not a Number) values, you can use the `isnan()` function, which is part of the standard Arduino library. You can write an `if` statement to check each variable and set it to `0` if it's `NaN`.

Here's how you can modify your existing loop to include this check:

```cpp
#include <DHT.h>

// Assuming you've defined these arrays and DHT sensor previously
const int numSensors = 2; // Number of DHT sensors
DHT dht[numSensors]; // Array of DHT sensor objects
float hum[numSensors];
float temp[numSensors];
float tempF[numSensors];

void setup() {
  Serial.begin(9600);
  // Initialize the DHT sensors
  for (int i = 0; i < numSensors; i++) {
    dht[i] = DHT(/*your pin*/, DHT11); // replace with your pin and type
    dht[i].begin();
  }
}

void loop() {
  for (int i = 0; i < numSensors; i++) {
    // Read data and store it to variables hum and temp
    hum[i] = dht[i].readHumidity();
    temp[i] = dht[i].readTemperature();
    tempF[i] = dht[i].convertCtoF(temp[i]);

    // Check if the readings are NaN and set them to 0 if true
    if (isnan(hum[i])) {
      hum[i] = 0;
    }
    if (isnan(temp[i])) {
      temp[i] = 0;
    }
    if (isnan(tempF[i])) {
      tempF[i] = 0;
    }

    // For debugging purposes: print the results
    Serial.print("Sensor ");
    Serial.print(i);
    Serial.print(": Humidity: ");
    Serial.print(hum[i]);
    Serial.print("%, Temperature: ");
    Serial.print(temp[i]);
    Serial.print("°C, Temperature in Fahrenheit: ");
    Serial.print(tempF[i]);
    Serial.println("°F");
  }
  
  delay(2000); // Wait for a bit before reading again
}
```

### Key Modifications:
- Added `if` statements using the `isnan()` function to check if any of the temperature or humidity readings are `NaN`.
- If a reading is `NaN`, it's set to `0`.

### Note:
- Make sure that your DHT library supports the `isnan()` function, as it's a standard function in C/C++. The DHT library typically handles errors that might lead to `NaN` readings.
- The `delay(2000)` at the end of the loop is to wait for 2 seconds before the next reading; adjust it as necessary based on your application requirements.

This approach will ensure that if any of the readings from the DHT sensors are invalid (i.e., NaN), they will be set to `0`, allowing your program to continue operating without errors.
User: when I run this code "/* How to use the DHT-22 sensor with Arduino uno
   Temperature and humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
*/

//Libraries
#include <DHT.h> //sensor library
#include <Wire.h> 
//#include <lcd.h>
#include <LiquidCrystal_I2C.h>
#include <ArduinoIoTCloud.h>
#include <Arduino_ConnectionHandler.h>

//Constants
#define DHTPIN2 22 // what pin the DHT22 Data is connected to
#define DHTPIN3 21 // what pin the DHT22 Data is connected to
// #define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht[] = {
{DHTPIN2, DHT22}, //// Initialize DHT sensor for normal 16mhz Arduino
{DHTPIN3, DHT22},

};
// WiFi network details
const char SSID[] = "FRITZ!Box 7590 YJ";
const char PASS[] = "37352551163306814881";

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

//Variables
int chk;
float hum[2];  //Stores humidity value
float temp[2]; //Stores temperature value
float tempF[2];//Stores Fahrenheit value
int fanPin = 0;  
int fanSpeed = 0;
void setup()
{
  /*
  lcd.init(); // initialize the lcd
  lcd.backlight();
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Arduino");        // print message at (0, 0)
  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
  lcd.print("Booting Up"); // print message at (2, 1)
  
  lcd.begin(16,2);
  lcd.init(); // initialize the lcd
  lcd.backlight();
*/
  for (int i = 0; i < 2; i++){
    dht[i].begin();
  }
  Serial.begin(115200);
  pinMode(fanPin, OUTPUT);
  
  // Configure IoT Cloud credentials
  ArduinoCloud.setThingId("aedfab40-35f5-474b-a736-f9324c0dade2");
  ArduinoCloud.addProperty(fanSpeed, READWRITE, ON_CHANGE, onFanSpeedChange);
  
  // Set up the WiFi connection
  WiFiConnectionHandler wifi(SSID, PASS);
  // Connect to the Arduino IoT Cloud
  ArduinoCloud.begin(wifi);

}

void loop()
{
  ArduinoCloud.update();
  analogWrite(fanPin, fanSpeed);



  for (int i = 0; i < 2; i++) {
  //Read data and store it to variables hum and temp
  hum[i] = dht[i].readHumidity();
  temp[i] = dht[i].readTemperature();
  tempF[i] = dht[i].convertCtoF(temp[i]);
    // Check if the readings are NaN and set them to 0 if true
    if (isnan(hum[i])) {
      hum[i] = 0;
    }
    if (isnan(temp[i])) {
      temp[i] = 0;
    }
    if (isnan(tempF[i])) {
      tempF[i] = 0;
    }
  
  }

  for (int i = 0; i < 2; i++) {
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum[i]);
  Serial.print(" %, Temp: ");
  Serial.print(tempF[i]);
  Serial.print(" Fahrenheit ");
  Serial.print(temp[i]);
  Serial.println(" Celsius");
  //Print temp and humidity values to LCD
  lcd.setCursor(0,0);
  lcd.print("Humidity: ");
  lcd.print(hum[i]);
  lcd.print("%");
  lcd.setCursor(0,1);
  lcd.print("T:"); 
  lcd.print(temp[i]);
  lcd.write(0xdf); // "°" Kann nicht als String geprintet werden. Deswegen muss es direct aus dem Zeichsatz des LCDs gewritten werden, welches an Position 0xdf liegt.
  lcd.print("C ");
  lcd.print(tempF[i]);
  lcd.println("F");
  delay(5000);     //Delay 5 sec between temperature/humidity check
  }

}

void onFanSpeedChange() {
  Serial.print("Fan Speed changed to: ");
  Serial.println(fanSpeed);
}"
Assistant: