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LED555 writes – “The project is an LED sign. The LED sign is a sign made up of 512 individual LEDs, which has RS-232 communication capabilities used for programming user defined messages. The brain is a PICmicro 16F786 microcontroller, programmed in PICBasic. Everything in this project is either hand made or special order made. The only stock parts are the electronic components. The 512 LED module is hand made out of individual LEDs.”Link.