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: