How to Use Adafruit Airlift Bitsy Add-On: Examples, Pinouts, and Specs

The Adafruit Airlift Bitsy Add-On is a compact Wi-Fi co-processor module that brings wireless connectivity to Adafruit Feather boards. It leverages the capabilities of the ESP32, a powerful SoC with integrated Wi-Fi and Bluetooth functionalities. This add-on is particularly useful for Internet of Things (IoT) projects, enabling devices to communicate wirelessly for data transfer, remote monitoring, and control applications.

• IoT devices
• Remote sensors
• Wireless data logging
• Home automation
• Remote control for robotics
• Wearable electronics

• Wi-Fi Chipset: ESP32
• Network Protocols: 802.11b/g/n
• Bluetooth: Classic and BLE
• Operating Voltage: 3.3V
• Logic Levels: 3.3V (compatible with 5V logic with level shifting)
• Current Consumption: ~10 mA (idle), up to 250 mA (transmit)

1. Power Supply: Connect the 3V pin to a 3.3V power source and GND to the ground.
2. Enable Pin: Connect the EN pin to 3.3V to enable the module.
3. SPI Communication: Connect SCK, MISO, MOSI, and CS to the corresponding SPI pins on your Feather board.
4. UART Communication: Optionally, connect TX and RX for UART communication if required by your application.

• Ensure that the power supply is stable and can provide sufficient current for both the Feather board and the Airlift module.
• Use proper decoupling capacitors close to the power pins to minimize noise.
• When using SPI communication, ensure that the SPI bus is not shared with other devices that may interfere with the Wi-Fi module's operation.
• For UART communication, ensure that the baud rate is correctly set to match the module's default or configured rate.
• Always disconnect the module from power before making or changing connections to prevent damage.

• Module Does Not Power On: Check the power connections and ensure the EN pin is connected to 3.3V.
• No Wi-Fi Connection: Verify that the antenna is properly connected and that the Wi-Fi credentials are correctly set in your code.
• Intermittent Connectivity: Ensure that the power supply can handle peak current draws and that there is no significant voltage drop.

• Double-check wiring against the pin configuration table.
• Use serial output to debug and check for error messages or status codes.
• Reset the module by toggling the EN pin if it becomes unresponsive.
• Update the firmware of the ESP32 module if persistent issues occur.

#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(115200);

  // Start the Wi-Fi connection process
  WiFi.begin(ssid, password);

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Once connected, print the IP address
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Your main code would go here
}

Remember to keep the code comments concise and within the 80 character line length limit. This example demonstrates how to connect the Adafruit Airlift Bitsy Add-On to a Wi-Fi network using an Arduino sketch.