How to Use blueIOT RevB: Examples, Pinouts, and Specs

The blueIOT RevB is a versatile Internet of Things (IoT) development board that integrates the power of the ATmega32U4 microcontroller with Wi-Fi and Bluetooth connectivity. This board is designed for hobbyists, educators, and professionals who are looking to develop IoT applications with ease. The blueIOT RevB is suitable for a wide range of applications, including home automation, sensor networks, and wireless control systems.

• Microcontroller: ATmega32U4
• Operating Voltage: 5V
• Input Voltage (recommended): 7-12V
• Input Voltage (limits): 6-20V
• Digital I/O Pins: 20
• PWM Channels: 7
• Analog Input Channels: 12
• DC Current per I/O Pin: 40 mA
• DC Current for 3.3V Pin: 50 mA
• Flash Memory: 32 KB (ATmega32U4) of which 4 KB used by bootloader
• SRAM: 2.5 KB (ATmega32U4)
• EEPROM: 1 KB (ATmega32U4)
• Clock Speed: 16 MHz
• Wi-Fi: Built-in
• Bluetooth: Built-in

1. Powering the Board: Connect a power supply to the VIN pin (6-20V) or plug the board into a USB port for power.
2. Programming: Use the micro USB port to connect the board to a computer for programming.
3. Digital I/O: Utilize the digital pins (D2-D15) for input or output functions. Remember to set the pin mode in your code.
4. Analog Input: Connect sensors to the analog pins (A0-A7) to read varying voltages.
5. PWM Output: Use PWM capable pins (D3, D5, D6, D9, D10, D11, D13) to control devices like LED brightness or motor speed.
6. Serial Communication: Employ TXD and RXD for UART communication.
7. I2C Communication: Connect I2C devices to SDA and SCL pins.

• Always disconnect the board from power sources before making or altering connections.
• Use a current limiting resistor with LEDs to prevent damage.
• Avoid supplying voltage higher than the pin's limit to prevent damage to the board.
• Ensure that the board's ground is connected to the ground of other components in the circuit.

// This example code is designed to quickly deploy a Wi-Fi connection.
#include <SPI.h>
#include <WiFiNINA.h>

char ssid[] = "yourNetwork"; // your network SSID (name)
char pass[] = "secretPassword"; // your network password
int status = WL_IDLE_STATUS; // the Wi-Fi radio's status

void setup() {
  // Initialize serial and wait for the port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB
  }

  // Check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // Don't continue if the shield is not present
    while (true);
  }

  // Attempt to connect to Wi-Fi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network:
    status = WiFi.begin(ssid, pass);
  }

  // You're connected now, so print out the status:
  printWifiStatus();
}

void loop() {
  // Do nothing here; we only want to connect to Wi-Fi in this example
}

void printWifiStatus() {
  // Print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // Print your board's IP address:
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("Signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

• Wi-Fi or Bluetooth not connecting: Ensure that the correct credentials and settings are used for the Wi-Fi network or Bluetooth device.
• Board not recognized by computer: Check the USB cable and drivers. Try a different USB port or cable.
• Unexpected behavior in circuits: Verify that all connections are correct and secure. Check for shorts or incorrect wiring.

• Reset the board: If the board is not behaving as expected, press the reset button to restart the board.
• Update firmware: Ensure that the board's firmware is up to date for optimal performance.
• Serial Monitor: Use the Serial Monitor to debug and monitor the output from the board.

Q: Can the blueIOT RevB be powered by a battery? A: Yes, it can be powered by a battery connected to the VIN pin, as long as the voltage is within the specified limits (6-20V).

Q: How do I update the Wi-Fi or Bluetooth firmware? A: Firmware updates can be done through the Arduino IDE, using specific update sketches provided by the manufacturer.

Q: What is the maximum range of the Bluetooth connection? A: The range of Bluetooth can vary depending on the environment, but typically it is around 10 meters (33 feet) without obstructions.

Q: Can I use the blueIOT RevB with the Arduino IDE? A: Yes, the blueIOT RevB is compatible with the Arduino IDE, and you can program it using the same methods as other Arduino boards.