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• How to Control Blue Status LED
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• ODROID-C4 with mini DC UPS
• S/PDIF

If you want to remap the blue heartbeat LED to other GPIO, refer this great instruction.

Alternative Heartbeat LED

• Dallas 1-Wire Support
• Enhancement of 40pin GPIO
• GPIO Status Check Program
• ODROID-C4 I2C Controller(Device Node) Information
• Hardware GPIO-IRQ
• Memory Mapped GPIO
• Hardware PWM
• SPI
• WiringPi and Python Wrapper
• Power Off and Wake Up using GPIO Key Button
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• CAN BUS
• Android Things with I2C 20x4 LCD
• Android Things with LED
• Android Things with PWM
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• UART
• ADC
• IR

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• How to add more SPI slave devices with SS and IRQ
• Watchdog on Linux/Ubuntu

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• How to activate dmesg on display