Features of the Arduino LED Matrix include : – Single-color 32 x 9 or 64 x 9 LED matrix display with several color options ... – Two or four IS31FL3731 LED matrix drivers ...

The dimming effect is achieved using PWM provided by an Arduino UNO board. The DIM pin can be driven by an external DC voltage between 0.5V and 2.5V. If the voltage is higher than 2.5V the output ...

The LED segments of the display require current-limiting resistors when powered from a 5 V logic pin. The value of the resistor is typically between 330 and 470 ohms. And, driver transistors are ...

Instead of the relative horror of driving 40 LEDs with a single Arduino, [Martyn] bit the bullet and got a Maxim 7221 LED driver.