How to Use Adafruit 8x16 LED Matrix FeatherWing - Red: Examples, Pinouts, and Specs

The Adafruit 8x16 LED Matrix FeatherWing in Red is a versatile and visually appealing electronic component that offers a grid of 128 red LEDs arranged in an 8x16 matrix. This LED matrix is designed to be used with the Adafruit Feather series of development boards, providing a compact and easy-to-use display option for a variety of projects. Common applications include scrolling text displays, animations, simple graphics, and interactive games.

• Dimensions: 16mm x 32mm x 1.6mm / 0.63" x 1.26" x 0.06"
• Weight: 4.7 grams
• LED Color: Red
• Matrix Size: 8x16 (128 LEDs total)
• Operating Voltage: 3.3V to 5V DC
• Max Current Draw: 320mA at 5V (all LEDs on)
• Interface: I2C
• I2C Addresses: 0x70 (default), selectable with jumpers

1. Power Connections:

   • Connect the VCC pin to the 5V output on the Arduino UNO.
   • Connect the GND pin to one of the GND pins on the Arduino UNO.

2. Data Connections:

   • Connect the SDA pin to the A4 pin (SDA) on the Arduino UNO.
   • Connect the SCL pin to the A5 pin (SCL) on the Arduino UNO.

3. Library Installation:

   • Install the Adafruit_LED_Backpack library through the Arduino Library Manager.

4. Programming:

   • Include the library in your sketch and initialize the display.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_LEDBackpack.h>

Adafruit_8x16matrix matrix = Adafruit_8x16matrix();

void setup() {
  matrix.begin(0x70); // Start the LED matrix with the I2C address
  matrix.setBrightness(10); // Set brightness to a value between 0 and 15
}

void loop() {
  matrix.clear(); // Clear the matrix display
  matrix.setCursor(0, 0); // Set cursor at top-left corner
  matrix.print(F("Hello")); // Print a message to the matrix
  matrix.writeDisplay(); // Update the display with the new data
  delay(500); // Wait for half a second
}

• Power Requirements: Ensure that your power supply can handle the maximum current draw if all LEDs are lit.
• Brightness Control: Adjust the brightness to suit your application and to manage power consumption.
• I2C Addressing: If using multiple matrices, set unique I2C addresses using the ADDR solder jumpers.
• Heat Dissipation: Be mindful of heat generation when operating at high brightness for extended periods.

• LEDs Not Lighting Up: Check connections and ensure the correct I2C address is used in your code.
• Dim Display: Verify that the brightness is set correctly in your code and that the power supply is adequate.
• Flickering Display: Ensure there is a stable power supply and check for loose connections.

• Power Supply: Use a dedicated power supply if the Arduino UNO cannot provide sufficient current.
• Code Debugging: Use serial output to debug your code and confirm that the matrix is receiving commands.
• I2C Scanning: Use an I2C scanner sketch to confirm the matrix's address if unsure.

Q: Can I use this LED matrix with other microcontrollers? A: Yes, as long as the microcontroller supports I2C communication and can provide the necessary power.

Q: How do I change the I2C address? A: Solder or desolder the jumpers on the ADDR pin to set a new address.

Q: Can I daisy-chain multiple matrices? A: Yes, you can connect multiple matrices in series, but ensure each has a unique I2C address.

Q: Is it possible to use this matrix with a 3.3V system? A: Yes, the matrix can operate at 3.3V, but the LEDs may be dimmer compared to a 5V supply.

For further assistance, consult the Adafruit forums or the product's official documentation.