Design with Adafruit Charlieplex 9x16 Warm White in Cirkit DesignerThe Adafruit Charlieplex 9x16 Warm White LED Matrix is a compact and versatile display component that consists of 144 individually controllable warm white LEDs. This LED matrix utilizes the charlieplexing technique to enable control over each LED with a minimal number of microcontroller pins. It is ideal for creating eye-catching displays, indicators, and animations in projects where space is at a premium and power consumption needs to be minimized.
This circuit features an Arduino Mega 2560 microcontroller programmed to control a WS2812 RGB LED strip and a white LED, indicating status or providing user feedback. The Arduino and the LED strip are powered by a common 5V supply, and the circuit includes interfacing with a Raspberry Pi 4B for potential communication or coordination between the two boards.
Open Project in Cirkit Designer
This circuit integrates an Adafruit Circuit Playground Bluefruit with an Adafruit Crickit for Circuit Playground Express to control a temperature sensor, a loudspeaker, and a series of WS2812 RGB LED strips. The Crickit board reads temperature data, drives the loudspeaker, and controls the LED strips to create visual effects based on the sensor input.
Open Project in Cirkit Designer
This is an interactive display and communication circuit. It uses an Arduino UNO to drive multiple WS2812 RGB LED matrices for visual output, interfaces with a DS3231 RTC for time-related functions, and communicates wirelessly via an HC-05 Bluetooth module. Additionally, it features audio output capabilities through a speaker connected to a PAM8403 audio amplifier.
Open Project in Cirkit Designer
This circuit features an ESP32 Devkit V1 microcontroller connected to a DHT22 temperature and humidity sensor and an 8x8 WS2812 RGB LED matrix. The ESP32 reads temperature data from the DHT22 sensor and displays the current date, time, and temperature on the LED matrix, with date and time synchronized via NTP (Network Time Protocol). The ESP32 provides power to both the DHT22 and the LED matrix and communicates with the DHT22 via GPIO 4 and with the LED matrix via GPIO 5.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | GND | Ground connection |
| 2 | VCC | Power supply (3.3V - 5V) |
| 3 | SDA | I2C Data line |
| 4 | SCL | I2C Clock line |
| 5 | ADDR | I2C Address selection (connect to GND or VCC) |
Power Connections: Connect the VCC pin to your power supply (3.3V - 5V) and the GND pin to the ground.
I2C Connections: Connect the SDA and SCL pins to the corresponding I2C data and clock lines on your microcontroller, such as an Arduino UNO.
Address Selection: The ADDR pin can be connected to GND or VCC to select between two I2C addresses. This allows for two matrices to be used on the same I2C bus.
Programming: Use the provided library and example code to control the LEDs.
#include <Wire.h>
#include <Adafruit_IS31FL3731.h>
// Create the LED driver object
Adafruit_IS31FL3731 matrix = Adafruit_IS31FL3731();
void setup() {
Wire.begin(); // Start I2C
if (!matrix.begin()) { // Initialize the LED driver
Serial.println("IS31FL3731 not found");
while (1);
}
Serial.println("IS31FL3731 found!");
}
void loop() {
matrix.fillScreen(0); // Clear the display buffer
// Draw a diagonal line
for (int i = 0; i < 9; i++) {
matrix.drawPixel(i, i, 50); // Set brightness to 50 out of 255
}
matrix.writeDisplay(); // Update the display with the buffer content
delay(500);
}
Q: Can I use this matrix with a 3.3V microcontroller? A: Yes, the matrix can operate at 3.3V, but ensure that the I2C logic levels are compatible.
Q: How many of these matrices can I chain together? A: You can chain two matrices together on the same I2C bus by using different addresses set by the ADDR pin.
Q: What library should I use to control the matrix? A: The Adafruit_IS31FL3731 library is recommended for controlling the matrix with an Arduino.
Q: Can I control the brightness of individual LEDs? A: Yes, each LED's brightness can be controlled individually using the library's functions.