LED Matrix (Troyka Module)

  • AMP-B099
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Gadgets should be interactive. If you don't want to wire a handful of LEDs and a LCD screen does not suit your fancy, then this LED matrix is what you need.

On the one inch module there are 64 red LEDs, where each LED is controlled independently. On the matrix you can display lowercase and uppercase letters, numbers, symbols, or even arbitrary designs. The update rate is even sufficient to output a simple eight-band audio equalizer.

The brightness of the LEDs varies discretely. You can programmatically select one of sixteen preset levels which will optimize power consumption and the uptime of the standalone module.


The module is connected to the control electronics by five wires. Two three-wire jumper cables are included in the kit.

The lower group of pins is used to connect the module to the power supply and to transmit the analog signal in equalizer mode:

  • Signal (S) - connect to the analog output of a microcontroller or audio module (i.e., noise sensor or 3.5 mm audio input)
  • Power (V) - Power Bus
  • Ground (G) - Ground Bus

The LED module has an on board buffer to convert voltage levels. This allows the module to work with both 3.3 V and 5 V.

The upper group of pins is used to exchange information with the microcontroller using the I²C protocol:

  • Pin D - Data transfer pin. Connect to the SDA pin of the microcontroller
  • Pin C - I²C bus clock bus pin. Connect to the SCL pin

In addition, there are several different ways to wire this module:

Troyka Shield. The most straightforward method. Connect the module to a pin group on Troyka Shield with the 3-pin jumper cable and you’re ready to interface with it from your Arduino.

Troyka Slot Shield. The best choice for quick prototyping. Using slots on the shield, you can get rid of cables. The module will be held securely in place using both pin headers.

You can connect up to four LED modules to one I²C bus. If you want to do this, you will need to change the addresses on three of them.

The address is set by a combination of contacts on the back of the module. Out of the box, they are all unsoldered. To close the contact place some solder on the desired jumper.

Package Contents


  • Matrix Controller: IS31FL3728
  • LED Matrix: 788BS
  • Number of LEDs: 64
  • Operating Voltage: 3.3 V to 5 V
  • Current Draw: up to 2 A
  • Dimensions: 25.4 × 25.4 mm
  • Protocol: I²C