Item Type: Matrix LED Display Module_x000D_ Model: DM42A16_x000D_ LED Light Colour: Red_x000D_ Pixel Size Pitch: Approx. 1.9mm / 0.7in_x000D_ Matrix Specifications: 16x16_x000D_ Drive: 74hc595_x000D_ Function: Can Display Various Patterns and Characters_x000D_ Applicable MCU Platform: _x000D_ for FPGA CPLD_x000D_ for STM32 C51 AVR PIC_x000D_ for Raspberry Pi_x000D_ for Nordmcu 1Stacking Multiple Modules: The matrix display module with input and output interfaces supports stacking multiple modules. 2Large Display Range: 16x16 LED matrix specification display module, display range is large and diversified. 3Red LED Light: The matrix display module is equipped with red LED light, which can display various patterns and characters. 4Excellent Visual Effect: The matrix display module has excellent visual effect, and the viewing effect of text and graphics is better. 5Strong Compatibility: This is a matrix display module compatible for Raspberry Pi, for Nordmcu and other development boards.1. The frequency of CPU is relatively low. If more than 3 modules are connected in series, the LED will flash. 1CPU frequency is relatively low. If more than 3 modules are connected in series, the LED will flash._x000D_ 2. For MCU (C51 ARM AVR), please modify the code and IO port operation mode by yourself1 x Matrix Display Module