The Adafruit FeatherWing Doubler is an innovative prototyping add-on designed to complement the Adafruit Feather ecosystem. This board effectively doubles the available prototyping area and provides additional access to the GPIO pins of a Feather board. It is ideal for hobbyists, engineers, and makers who require more space for components or need to connect multiple FeatherWings together.
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This circuit features an Adafruit HUZZAH32 ESP32 Feather board as the central microcontroller, which is connected to an Adafruit Quad AlphaNumeric Featherwing display and an Adafruit ADXL343 accelerometer via I2C communication (SCL and SDA lines). The ESP32 controls a vibration motor connected to one of its GPIO pins (A5_IO4) and shares a common power supply (3.3V) and ground (GND) with the other components. The purpose of this circuit is likely to read acceleration data, display information on the alphanumeric display, and provide haptic feedback through the vibration motor.
This circuit is designed to interface multiple sensors with an Adafruit Feather M0 Adalogger microcontroller for data logging purposes. The sensors include a MAX30205 temperature sensor, a body dehydration sensor, a MAX30102 pulse oximeter, an Adafruit LSM6DSOX 6-axis accelerometer and gyroscope, and an Adafruit BME680 environmental sensor. All sensors are connected to the microcontroller via an I2C bus, sharing the SDA and SCL lines for communication.
This circuit consists of an Arduino UNO connected to an Adafruit OLED FeatherWing display via I2C communication (SDA and SCL lines). The Arduino is powered through a Vcc source and provides 3.3V and GND connections to the OLED display. The Arduino runs a program to display 'Hello, World!' on the OLED screen.
This circuit integrates an Adafruit MPR121 capacitive touch sensor with an Adafruit Feather 32u4 Bluefruit microcontroller. The MPR121 is powered by the Feather and communicates via I2C (SCL and SDA) to detect touch inputs, which can be processed or transmitted wirelessly by the Feather.
Expanding the number of FeatherWings that can be connected to a single Feather board.
Providing a larger breadboard-like area for prototyping custom circuits.
Facilitating the creation of more complex projects by offering additional GPIO access.
Technical Specifications
Key Technical Details
Dimensions: 50.8mm x 22.9mm x 1.6mm / 2" x 0.9" x 0.06"
Weight: 4.2g / 0.15oz
Compatibility: Works with all Feather boards
Pin Configuration and Descriptions
Pin Number
Description
GND
Ground
3V
3.3V Supply from Feather
BAT
Battery Voltage (if available)
USB
USB Voltage (if available)
A0-D13
Analog and Digital Pin Breakout
SCK, MISO, MOSI
SPI Pin Breakout
SDA, SCL
I2C Pin Breakout
TX, RX
UART Pin Breakout
Usage Instructions
How to Use the Component in a Circuit
Mounting the Feather Board:
Align the headers of your Feather board with the female headers on the FeatherWing Doubler.
Press down gently to ensure a secure connection.
Connecting Additional FeatherWings:
Use the pass-through headers to stack another FeatherWing on top of the Doubler.
Ensure that the pins are aligned correctly to avoid damaging the boards.
Prototyping:
Use the prototyping area to add components or build custom circuits.
The grid of 0.1" spaced holes is compatible with most through-hole components and male/female headers.
Important Considerations and Best Practices
Power Supply: Ensure that the power requirements of all connected boards and components do not exceed the power capabilities of the Feather board.
Pin Usage: Be mindful of pin conflicts when stacking multiple FeatherWings. Consult the documentation for each board to avoid issues.
Firmware Updates: When using the Doubler with development boards that support firmware updates, ensure that the connections do not interfere with the update process.
Troubleshooting and FAQs
Common Issues
Loose Connections: If your circuit is not working as expected, check all connections for a secure fit.
Power Issues: Verify that the power supply is adequate for all connected components.
Pin Conflicts: If multiple boards are not working together, ensure there are no pin conflicts.
Solutions and Tips for Troubleshooting
Re-seat Connections: Disconnect and reconnect the Feather board and any FeatherWings to ensure a good connection.
Check Compatibility: Make sure that all FeatherWings are compatible with each other and with the Feather board in use.
Review Documentation: Refer to the documentation for each individual FeatherWing for specific troubleshooting steps.
FAQs
Q: Can I use the FeatherWing Doubler with any Feather board?
A: Yes, the Doubler is designed to be compatible with all Feather boards.
Q: How many FeatherWings can I connect with the Doubler?
A: The Doubler allows you to connect one additional FeatherWing directly. However, with stacking headers, you can add more.
Q: Does the Doubler come with headers pre-soldered?
A: Headers are usually not pre-soldered, giving you the flexibility to choose the best configuration for your project.
Example Code for Arduino UNO
The FeatherWing Doubler is not directly used with an Arduino UNO, as it is designed for the Adafruit Feather series. However, if you are using a Feather compatible with Arduino IDE, you can use the standard GPIO functions to interact with the pins.
// Example code to blink an LED connected to pin 13 on the Doubler
void setup() {
pinMode(13, OUTPUT); // Set pin 13 as an output
}
void loop() {
digitalWrite(13, HIGH); // Turn the LED on
delay(1000); // Wait for a second
digitalWrite(13, LOW); // Turn the LED off
delay(1000); // Wait for a second
}
Remember to adjust the pin numbers and functionality according to the specific Feather board and the peripherals you are using. Always consult the Feather board's documentation for the correct usage of GPIO pins.
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