LED Matrix board circuit

Posted on Sep 9, 2012

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.

LED Matrix board circuit
Click here to download the full size of the above Circuit.

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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