Surely, the chip needs power supply to work it needs clock circuit to control LED blink time it needs Download/Configure circuits to program the compiled project it needs reset circuits to reset and begin again. And the time span of the high or low output controls the time span of light up. How do the MCU finish such a common demo? And what circuit work together? For the MCU system, actually its program controls the I/O pins to output high or low to turn on or turn off the LEDs. This demo is an example of flashing alternately LED, controlled by the MCU. First of all, we start from the common LED demo. Go with you to witness how a ATmega128A-AU chip becomes OpenM128 board. Hardware design This chapter mainly about a basic idea of the hardware design of OpenM128. It helps you to quick start your AVR development. Overview This user manual contains schematic and demo of Waveshare OpenM128 development board.
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