Raspberry Pi LED matrix board compatible with PI Lite details

This product belongs to module series used on foreign PI-Lite hardware.  

1. Compared with original version, this one has been added LLC (logic level conversion circuit). 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. Protecting IO interface of PI from impact of 5V serial port.

2. Single-chip Atmega328 runs stably at 16MHz, which is twice as fast as 3.3V circuit, helping improve the refreshing rate of LED. 

3. All 126 LED are imported from Taiwan Yiguang and was made by automatic