Design with Adafruit Blue 15x7 CharliePlex FeatherWing in Cirkit DesignerThe Adafruit Blue 15x7 CharliePlex FeatherWing is an LED matrix display panel that provides a simple way to add a vibrant visual display to your projects. It features a grid of 105 blue LEDs arranged in a 15x7 pattern. This component is designed to be used with the Feather series of development boards from Adafruit, which are compact, easy to use, and versatile for a wide range of applications.
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.
Open Project in Cirkit Designer
This circuit integrates an Adafruit MPR121 capacitive touch sensor with an Adafruit Feather 32u4 Bluefruit microcontroller. The MPR121 is powered by the 3.3V supply from the Feather and communicates with the microcontroller via I2C, with SCL connected to pin 3 and SDA connected to pin 2 of the Feather. This setup allows the Feather to detect touch inputs from the MPR121 for further processing or wireless communication.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer| Pin | Description |
|---|---|
| GND | Ground connection |
| VIN | Power supply input (3.3V to 5V DC) |
| SDA | I2C data line |
| SCL | I2C clock line |
| ADDR | I2C address selection (solder jumper) |
| RST | Reset pin (optional use) |
#include <Wire.h>
#include <Adafruit_IS31FL3731.h>
// Create the LED matrix object
Adafruit_IS31FL3731 matrix = Adafruit_IS31FL3731();
void setup() {
Wire.begin(); // Start I2C
if (!matrix.begin()) { // Initialize the CharliePlex matrix
Serial.println("IS31FL3731 not found");
while (1);
}
Serial.begin(9600);
Serial.println("IS31FL3731 found!");
}
void loop() {
matrix.setBrightness(127); // Set the brightness to a medium value
matrix.fillScreen(0); // Clear the matrix
for (uint8_t i=0; i<15; i++) {
matrix.drawPixel(i, i, 50); // Draw a diagonal line
matrix.writeDisplay(); // Update the display
delay(100);
}
}
Note: The above code is for demonstration purposes and assumes the use of an Arduino UNO with an I2C interface. Make sure to install the Adafruit_IS31FL3731 library before uploading the code to your board.
Serial.print statements to debug and verify that the matrix is initialized correctly.Q: Can I use the CharliePlex FeatherWing with other microcontrollers besides the Feather series? A: Yes, as long as the microcontroller supports I2C communication and operates within the voltage range of the CharliePlex FeatherWing.
Q: How do I change the I2C address? A: The I2C address can be changed by soldering the ADDR jumpers on the back of the board to connect different combinations of the address pins to ground.
Q: Can I control individual LEDs? A: Yes, the library provided by Adafruit allows you to control each LED individually.
Q: Is it possible to daisy-chain multiple CharliePlex FeatherWings? A: Yes, you can daisy-chain multiple units as long as each one has a unique I2C address.