9 x 14 PI Matrix Board with 126 LED Lights for Raspberry Pi Main Features: ● LLC ( logic level conversion circuit ) has been added on this shield. The serial ports of Raspberry Pi on this end is 3.3V. ● Single-chip Atmega328 controls 126 LED lights, which are all supplied by 5V power. IO interface of protecting PI is free from impact of 5V serial port. ● Single-chip Atmega328 runs stably at 16MHz, which is twice as fast as 3.3V circuit and help improve the refreshing rate of LED.