LeD MaTRiX
This is a simple, programmable, autonomous and extensible LED matrix with the possibility of being controlled by a computer using a RS232 connection. Its basic modules are the Controller Board, the I/O Port expander boards and the LED matrix cardboard support. The micro controller is a common Microchip PIC16F88, which has built-in support for I2C slave with a minimal support for I2C master, ASUART, PWM,multiplexed ADC and other interesting peripherals.The controller board also has an external 512kbit EEPROM to allow a bigger storage of drawing patterns and it uses the common MAX232 level shifter for easy interface with the PC RS232.The I/O port expander boards, which control both the vertical and horizontal lines of the matrix, were built around the MCP23016, which has 16 I/O lines and built-in I2C slave.
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